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ANNALS OF THE SOUTH AFRICAN MUSEUM
ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM
Volume 57
December 1971
Part 12
Band
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INVERTEBRATE
ZOOLOGY
Crustacea
THE GENUS GENNADAS IN THE WATERS
AROUND SOUTHERN AFRICA
By
BRIAN KENSLEY
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THE GENUS GENNADAS IN THE WATERS AROUND
SOUTHERN AFRICA
By
BRIAN KENSLEY
Introduction
Systematic discussion.
Summary.
Acknowledgements
References
PAGE
271
272
292
293
293
Since 1881, when Bate described his new genus Gennadas with G. parvus
as the type species, several more species have been described. It was found
that superficially the species were very similar, carapace and appendage charac-
teristics being of little specific use. As it is also sometimes difficult to associate
males and females of the same species, a great confusion and proliferation of
species occurred. It has since been recognized that the male petasma of the
1st pleopods and the female thelycum formed by the last 3 thoracic sternites,
provide the best diagnostic characters for the separation of the species. Burken-
road (1936) improved the knowledge of the genus by carefully describing and
figuring the thelyca of several species while Tirmizi (1960) has also described
and figured several species.
Barnard (1950) recorded 7 species from the South Mrican region, while
G. bouvieri and G. clavicarpus (as G. propinquus) were later added (Kensley 1968,
1969)' The present collection includes II species, 4 of which are new records
for the region, but does not include G. talismani and G. elegans, which have been
recorded from the South Atlantic. As the genus constitutes an important part
of the mesopelagic fauna of the waters around South Mrica, it was felt that
brief descriptions and figures of all the species involved would aid future
identifications. Emphasis has been placed on the petasmae and the thelyca,
being the best diagnostic characters.
The material of the present collection comes from several sources: the
Division of Sea Fisheries (stations denoted by 'A' followed by 4 digits); the
deep sea trawls off Cape Point (stations denoted by 'A' followed by 3 digits);
the South Mrican Museum bathypelagic survey (stations denoted by 'IK'),
and one sample from the University of Cape Town ecological collection.
SYSTEMATIC DISCUSSION
Genus GENNADAS
Rostrum short, unidentate. 2nd and 3rd peduncle segments of 1st antenna
expanded. Vestigial arthrobranch present on 1st maxilliped. No podobranchs
present behind 2nd maxilliped. Exopod of 1St maxiUiped without distal seg-
mented prolongation. Only 6th abdominal segment dorsally carinate. Telson
apically truncate, with single pair of mobile lateral spines. Petasma in male
with distal margin of 3 lobes, viz. external, median and internal, accessory lobe
always present. (See Barnard 1950, fig. 118, for terminology.) Appendix
masculina of 2nd pleopod of male bilamellate. Thoracic sternites 6 to 8 (i.e.
ventral surfaces between pereiopods 3 to 5) in female variously modified to
form thelycum.
List of species from southern African waters
Gennadas bouvieri Kemp
*Gennadas brevirostris Bouvier
Gennadas capensis CaIman
Gennadas clavicarpus De Man
Gennadas gilchristi CaIman
*Gennadas incertus (Balss)
Gennadas kempi Stebbing
*Gennadas parvus Bate
Gennadas scutatus Bouvier
*Gennadas tinayrei Bouvier
Gennadas valens (Smith)
Key to South African species of Gennadas (adultfemales)
1. Posteriorly directed tongue-like process on 5th thoracic sternite
No tongue-like projection of 5th sternite
2. Shield on 8th thoracic sternite with 2 anteriorly-directed projections
Shield on 8th thoracic sternite absent, or if present, lacking separated, anteriorly
directed lateral projections
3. Shield of 8th thoracic sternite with anterior flap reaching 6th sternite
Shield of 8th thoracic sternite not reaching 6th sternite
4. 7th sternite with 2 anteriorly-directed projections
7th th~racic sternite lacking 2 projections .
5. Projections of 7th sternite apically simple .
Projections of 7th sternite apically notched
6. Leaf-like process arising in front of 4th pereiopods, medially directed
No leaf-like projections in front of 4th pereiopods
7. Shield present on 8th thoracic sternite, posteriorly notched .
Shield absent on 8th thoracic sternite, or if present, not posteriorly notched
8. Shield on 8th 'thoracic sternite anteriorly rounded
Shield on 8th thoracic sternite anteriorly emarginate or notched .
Iint!7rIi
2
houvier'i
3
scutatus
4
5
6
valens
gilchristi
parous
7
8
10
brevirostris
9
g. Large concave depression on 6th thoracic sternite
No large concave depression on 6th thoracic sternite but broadly rectangular
shield on 7th thoracic sternite .
10. 6th thoracic sternite with triangular/subtriangular/truncated triangular shield
with anteriorly directed apex
6th thoracic sternite lacking shield, or with subcircular shield
II. 7th sternite with W-shaped process .
7th sternite with rectangular process
12. 6th sternite with W-shaped process, no obvious shield on 8th sternite
6th sternite without W-shaped process, pentagonal shield on 8th sternite
II
12
clavicarpus
kempi
capensis
elegans
Key to the South African species of Gennadas (based onpetasmal characters of adult males
,I. Median lobe undivided . 2
Median lobe divided 5
2. External lobe divided, division indicated by widelyseparated (elegans) or closely
approximate (tinayrei) blunt lobules
External lobe undivided or with small acute process on median margin.
3. Median lobe broadly convex
Median lobe low, narrow
4. Accessory lobe bipartite .
Accessory lobe a single flap
5. External lobe undivided.
External lobe divided
6. Lobules of external lobe elongate, subequal, slender
Lobules of external lobe not elongate, subequal, slender
7. Lobules of median lobe hooked
Lobules of median lobe not hooked
8. Accessory lobe a mere ridge
Accessory lobe well developed .
g. External lobule of median lobe slender
External lobule of median lobe not slender
10. Apex of internal lobe acute
Apex of internal lobe rounded .
II. Inner lobule of median lobe slender .
Inner lobule of median lobe blunt
12. Inner lobule of median lobe apically acute
Inner lobule of median lobe apically truncate
3
4tinayrei
elegans
capensis
kempi
brevirostris
6
7bouvieri
8
parvus
9
10
II
gilchristi
12
talismans
valens
clavicarpus
scutatus
Gennadas bouvieri Kemp, Igog
Fig. I
Gennadas bouvieri Kemp, Igog: 726, pI. 74, figs 1-4, pI. 75, figs 6, 7; IglOa: 17g. Burkenroad,
1936: 80. Tirmizi, 1960: 360, figs 4Od, 48e, 70-75. Kensley, 1968: 302.
Gennadas alcocki Kemp, IglOa: 174, pI. 13, figs 5, 6.
Amalopenaeus bouvieri: Balss, 1927: 267.
Amalopenaeus alcocki: Balss, 1927: 266, fig. 30.
Description
Antennal angle acute, infra-antennal angle quadrate. Spine on outer
scaphocerite margin reaching slightly beyond apex of scale. Thelycum of
female with shield on 8th thoracic sternite bearing elongate process on antero-
lateral corners. 7th thoracic sternite with rounded flap opening posteriorly,
attached anteriorly to shield of 6th segment, with small lateral process on
either side. Petasma in male with external lobe bipartite, both lobules apically
acute. Median lobe broad, with broad distal notch, two lobules thus formed
both apically acute. Internal lobe low, with numerous hooks. Accessory lobe
large, leaf~shaped.
./---------b
Fig. I. Gennadas bouvieri
a. Petasma. b. The1ycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles.
e. Appendix masculina.
Distribution
Indo-Pacific, South Atlantic, Caribbean, Bermudas, Bahamas.
Material
Station
IK34
Position Depth (metres)
26.30 S, 42.4? E 500
25.55 S, 39.30 E '5??
27.00 S, 43.30 E 500
26.40 S, 40.00 E 500
C.L.S (mm)
7,8
8,0
8,4
9,0
CLr.(. (mm)
7,5
7,0
6,0
6,5
7,5
7,9
8,1 '
Station
A321
AI892
A3616
Position Depth (metres) C.L.~ (mm)
34.33S, 16.42E 3200-3400
36.28S, 41.22E 1000
31.19S, 10.08E 250 8,0
8,1
C.L.c:;. (mm)
8,1
6,6
8,0
8,9
Gennadas brevirostrisBouvier, 1905
Fig. 2
Gennadas brevirostris Bouvier, 1905: 748. Tirmizi, 1960: 341. Crosnier & Forest, 1969: 549.
Gennadas similis Stephensen, 1923: 12, fig. I.
Gennadas chiasmifera Stephensen, 1923: 13, figs 2,3.
Amalopenaeus similis: Balss, 1927: 256, figs 8--10, pI. 6, fig. 2.
Description
Antennal angle acute, infra-antennal angle quadrate. Spine on outer
scaphocerite margin almost reaching apex of scale. Thelycum of female with
n
Fig. 2. Gennadas brevirostris
a. Petasma. b. Thelycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles.
e. Appendix masculina.
8th thoracic sternite bearing anteriorly rounded setose flap, coxa medially
produced into rectangular process. 7th thoracic sternite with W-shaped raised
portion posteriorly, coxa with short quadrate lobe. Coxa of 3rd pereiopod
produced into large lobed setose process. Petasma in male with external lobe
apically blunt, with small lobe at base, median lobe of 2 irregular, somewhat
elongate closely-applied lobules, internal lobe roughly triangular, bearing row
of peg-like spines on disto-medial edge, and many small hooks arranged in two
patches. Accessory lobe a simple flap with rounded corners.
Distribution
North Atlantic, Gulf of Guinea, off Congo and Angola, Cape Basin off
west coast of South Africa.
Material
Station Position Depth (metres) C.L.(J (mm) C.L.~ (mm)
IK6 34 S, 17 E 200 10,0 I I, I
10,8 11,0
10,0 11,5
8,9 11,2
8,0 10,6
10,2 10,0
11,0 9,3
11,0
10,6
9,9
11,0
10,9
12,5
11,0
10,8
8,7
8,8
8,6
9,0
9,1
A3541 37.00 S, 08.40 E S 9,5
Remarks
From previous records and from the present stations, it would seem that
this species is limited to the Atlantic Ocean.
An interesting specimen from station IK6 deserves comment. Although
possessing a perfect, matured thelycum and having eggs visible in the ovaries,
the first pleopods bear a petasma, which although smaller than that of a mature
male, is nevertheless unmistakably that of G. brevirostris.
Gennadas capensis CaIman, I9~5
Fig. 3
Gennadas capensis Caiman, 1925: 5, pI. I, figs I, 2. Burkenroad, 1936: 67, figs 51,53. Barnard,
1950: 630, fig. lISe, f.
Description
Antennal angle acute, infra-antennal angle quadrate. Spine on outer
margin of scaphocerite some distance from apex. Thelycum of female with
7th sternite bearing W-shaped process, median apex of which formed by
rounded concave process. Coxa of 5th pereiopod medially expanded, bilobed.
Coxa of 4th pereiopod with slender, elongate process. Coxa of 3rd pereiopod
bluntly lobed, coxa of 2nd bearing concave spoon-shaped process, posteriorly
directed. Petasma of male with external lobe bearing small acute lobe on
median margin, medina lobe truncate, internal lobe consisting of 2 hook-
covered blunt lobules. Accessory lobe bipartite, consisting of inner club-shaped
process and outer broad truncate process.
\~
) J
Fig. 3. Gennadas capensis
a. Petuma. b. Thelycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles.
e. Appendix masculina.
Distribution
Off Cape Point, Bahamas, Bermudas, Gulf of Mexico.
Material
Station
AI896
A3616
Position Depth (metres)
34. I 2 S, 28.24 E I 000
31.19 S, 10.08 E 250
C.L.~(mml'?>'
9,6
7,9
10,6
11,0
12,5
Gennadas clavicarpus De Man, 1907
Fig. 4?
GentUldas clarJicarpus De Man, 1907: 144. Tirmizi,Ig60: 358, figs 4OC,48e, 58-66.
Amalo[1entuus clarJicarpus: Balss, 1927: 267. .
GentUldas propinquus (non Rathbun) Burkenroad, 1936: 66, 83-85. Kensley, 1969: 167, fig. 9.
GentUldas scutatus (non Bouvier) Kemp, 191Oa: 178, pI. 13, figs 9, 10.
Gennadas scutatus indicus Balss, 1927: 259, fig. 13.
.... /.\~1;~.,,~~, Ii:'"'I'MJ
. Fig. 4. Gennadas clavicarpus . .
a. Petasma. b. Thelycum. c. Apex of scaphocerite. d. Antenna! and infni.?antennal angles.
e. Appendix masculina.
Description
,Antennal angle acute, ,infra-antennal angle quadrate. Spine on outer
margin of scaphocerite reaching beyond apex of scale. Thelycum offemale with
8~shaped shield on 8th thoracic sternite, coxa with large lobe. 7th thoracic
sternite with W-shaped process, closely connected to triangular shield of 6th
thoracic sternite. Openings of seminal receptacles at base of triangular shield.
Coxa of 3rd pereiopod with large lobed process. Petasma of male, external lobe
bipartite, outer lobule acute, slender, inner lobule rounded. Median lobe
large, bipartite, both lobules apically acute. Internal lobe bipartite, both
rounded, bearing hooks. Accessory lobe a simple flap.
Distribution
Widespread throughout the Indo-Pacific region.
Material
Station
IK6
IK35
Position
34 S, 17 E
25.55 S, 39.30 E
Depth (metres)
200
C.L.CS (mm)
7,1
7,5
6,2
26.30 S, 33.40 E 500
34?33 S, 16'42 E 3 200-3 400
A2387
A2945
A2958
A3616
37.36 S; 19.34 E
36.11 S'; 14.14.E
41.40 S, 17.17 E
31.19 S, 10.08 E
800
700
600
250
6,9
.6,3
C.L.c;;. (mm)
6,9
7,9
6,5
6,3
7,3
7,8
7,9
6,8
7,1
7,9
7,2
6,4
Remarks
Of the present records, 3 stations are in the area of the Cape Basin, i.e.
off the west coast of South Mrica, and seem to be the first record of the species
from the Atlantic Ocean. '
Gennadas elegans (Smith, ,1882)
Fig?.5,
Amalopenaeus elegans Smith,I882: 87, pI. 14, figs 8-14, pI. 15, figs 1-5. Kemp, I9IOb: 14, pI. 1.
Lenz &Strunck, 19.14:310. Balss, 1927: 253, fig. 3.
Gennadas elegans: Burkenroad, 1936: 71, fig. 55. Barnard, 1950: 631, fig. !I8m, n.
Description
Antennal angle acute, jnfra-antennal angle blunt. Thelycum of female
with pentagonal shield on 8th thoracic sternite. 7th sternite with roughly oval
shield posteriorly; anterior portion with dumb-bell-shaped shield bearing seminal
receptacles at ends. Petasma in male with small rounded lobe at base of external
lobe. Latter broad, divided, division indicated by blunt projection at each end.
Median lobe lower than external lobe, narrow, rounded. Internal lobe large,
apically evenly convex. Accessory lobe a leaf-like flap.
Distribution
Mediterranean, North and South Atlantic, not as yet known from southern
African waters.
. ."!{{Y'?~:4f./:?:''''';'?
"<)~)'"
.: ":..:<.:::::, /,:;.:; ....., ....... . .....
Fig. 5. Gennadas elegans
a. Petasma (after Smith, 1882). b. Thelycum (after Burkenroad, 1936).
Gennadas gilchristi CaIman, 1925
Fig. 6
Gennadas gilchristi CaIman, 1925: 6, pI. I, figs 3, 4. Burkenroad, 1936: 66, fig. 58. Barnard,
1950: 633, fig. 118 g, h. Kensley, 1968: 301.
Amalopenaeus gilchristi: Balss, 1927: 261, figs. 16, 17.
Amalopenaeus elegans (non Smith) Stebbing 1917: 31.
Description
Antennal and infra-antennal angles produced, but apically rounded.
Spine on outer margin of scaphocerite hardly reaching apex. Coxa of 3rd
pereiopod expanded, more noticeably prominent and bilobed in female than
in male. Thelycum of female easily distinguished by bilobed sternal process of
7th thoracic sternite. Petasma of male with external lobe acute, with smaller
lobe at its base, median lobe of 2 diverging slender lobules, internal lobe acute,
accessory lobe broadly rounded, not extending beyond internal lobe.
Distribution
Off Cape Peninsula, off west coast of South Africa, t\gulhas Basin, southern
Indian Ocean. ,\
)n
a. Carapace in lateral view. b. Antennal and infra-antenna! angle. c. Petasma. d. Thelycum.
e. Apex of telson. f. Apex of scaphocerite. g. Appendix masculina.
Material
Station
IK6
Position
34 S, 17 E
Depth (metres) C.L.i! (mm)
200
C.L.~ (mm)
6,6
5,3
282 ANNALSOF THE SOUTHAFRICANMUSEUM
Station Position Depth (metres) C.L.a (mm) C.L.r;;. (mm)
IK35 25.55 S, 39.30 E 5?0 4,8 5,0
5,2 5,5
4,9
DD
6,9
5,6
6,0
5,8
5,8
IK40 38.50 S, 33.08 E 5?0 6,0
IK39 37.40 S, .22.59 E 5,8 5,8
6,2 6,0
6,2 8,6
6,2 7,0
6,9 6,0
6,9 5,8
7,0
6,8
7,7
8,0
A321 34.33 S, 16.42 E 3200-34?0 6,5
AI8n 40.44 S, 33.36 E 5?0 7,0 6,1
AI879 43.29 S, 35.14 E 500 7,4
AI892 36.28 S, 41.22 E 100O 5,6 6,0
7,0 6,3
6,1
5,0
5,0
4,5
AI894 36.02 S, 35.38 E 5?0 D D
AI896 34. 12 S, 28.24 E 100O 4,8
4,8
A2387 37.36 S, 19.34 E 800 5,0
4,2
A2389 39.40 S, 20.00 E 800 D D
A2394 44.40 S, 26.05 E ' ..... $. 5,9 8,0
7,0
6,1
5,4
7,5
A2945 36.11 S, 14.14 E 7?0 5,1 6,x' .:.
5,8
A2958 41.40 S, 17.17 E 600 6,4-:
6,8
THE GENUS GENNADAS IN THE WATERS AROUND SOUTHERN AFRICA 283
Station Position Depth (metres) C.L.I] (mm) C.L.~ (mm)
A2961 40.12 S, 14.41 E 7?? 6,0
5,9?
5,6
4,3
A2962 ? 39.06 S, 13.34 E 600 7,1 8,18,0
7,3 .
7,0
6,1
A2963 ? 38.00 S, 15.00 E 600 6,5 5,07,0
6,0
5,6
A2966 38.09 S, 19.50E 600 7,2 6,8
4,9 6,8
A2968 36.38 S, 16.28 E 600 4,9 5,0
A3616 31.19 S, 10,08 E 25? 6,9 8,2
7,0 6,3
7,1 7,2
6,6
7,9
7,5
6,6
7,0
7,6
6,5
7,0
A3634 ? ? 33.23 S, ?9.31 E 25? 6,8 6,86,2
6,9
A3641 ? ? 37.00 S, 08.40 E S 5,6 7,06,9 7,0
7,5 7,0
7,0 7,0
6,9 7,0
6,9 7,2
6,7
A3643 ? 36.51 S, 12.43 E 25? 8,95,0
A4218 29.13 S, 10.03 E 100 7,2 8,0
6,0 7,9
5,4 7,9
5,8 7,5
Gennadas incertus (Balss, 1927)
Fig. 7
Amalopenaeus ineertus Balss, 1927: 265, figs 24-29.
Gennadas incertus: Burkenroad, 1936: 66. Tirmizi, 1960: 364, figs 76-80.
Gennadas gardineri Balss, 1927: 267, fig. 31.
Description
Antennal and infra-antennal angles acute. Spine on outer scaphocerite
margin reaching beyond apex of scale. Thelycum in female with large plate
on 8th thoracic sternite, anteriorly and posteriorly notched. Plate on 7th
thoracic sternite with antero-Iateral corners acute, postero-Iateral corners pro-
duced anteriorly. 6th thoracic sternite with large concave shield. Petasma in
male with external lobe of 2 large divergent tapering 'horns'. Median lobe of
2 lobules, outer slender, inner broadly rounded. Internal lobe simple, with
hooks on median face. Accessory lobe truncate, reaching same level as median
and internal lobes. Inner scale of appendix masculina of male distally cut
away at angle.
Distribution
Indian Ocean.
Fig. 7. Gennadas ineertus e
a. Petasma. b. Thelycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles.
e. Appendix masculina.
.\laterial
Station Position Depth (metres) CLI! (mm) CLc.{. (mm)
IK6 34 S, 17 E 200 7,2 6,6
6,8
IK35 25.55 S, 39.30 E 500 6,3
IK41 36.47 S, 34.40 E 5?0 7,0
IK42 35.42 S, 24-40 E 5?0 7,0 6,9
7,5
IK48 29.52 S, 31.36 E 500 5,0 7,6
5,2
IK51 33.10 S, 17.20 E 120 5,4 6,2
A2945 36.1 I S, 14.14 E 7?? 7,4
A2963 38.00 S, 15.00 E 600 6,6
A2965 40.17 S, 19.54 E 600 7,5 6,9
A3643 36.51 S, 12.43 E 25? 5,6
Gennadas kempi Stebbing, 1914
Fig. 8
Gennadas kempi Stebbing, 191?: 283, pI. 27; 1914b: 12. Caiman, 1925: 4. Burkenroad, 1936: 64,
figs 52, 54. Barnard, 1950: 630, fig. 118a-d. Kensley, 1968: 302.
Amalopenaeus kempi: Balss, 1927: 260, figs 14, 15.
Description
Antennal angle produced but bluntly rounded, infra-antennal angle
rounded. Spine on outer margin of scaphocerite set well behind apex of scale.
Thelycum of female consisting of 3 sternal plates, that on 6th thoracic sternite
triangular, 7th thoracic sternite rectangular, 8th thoracic sternite hexagonal.
Petasma of male with single acute external lobe, median lobe broad, truncated,
internal lobe also truncate, with rounded hook-bearing process. Both lamellae
of appendix masculina of 2nd pleopod of male somewhat elongate.
Distribution
Off west coast of South Mrica, off Cape Peninsula, Agulhas Basin, southern
Indian Ocean.
Material
Station Position Depth (metres) C.L.I! (mm) C.L.c.{.(mm)
AI90 32.26 S, 16.33 E 2200 8,2
D
A321 34.33 S, 16.42 E 3200-34?0 D D
9,8
AI8n 40.44 S, 33.36 E 5?0 10,0
286 ANNALSOF THE SOUTHAFRICANMUSEUM
Station Position Depth (metres) C.L.(J (mm) C.L.Cf. (mm)
AI879 . 43.29 S, 35.14 E 5?? 10,2 10,8
9,9 12,0
9,9 12,0
A2393 43.50 S, 25.00 E 800 10;9
A2953 44.24 S, 20.16 E 600 7,5
A2958 41.40 S, 17.17 E 600 8,9 10,0
8,0 10,9
9,9
10,7
7,3
10,8
9,0
11,0
D
8,1
A3643 36.51 S, 12.43 E 25? 8,0
Fig. 8. Gennadas kempi
a. Petasma. b. Thelycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles~
e. Appendixmasculina.
Gennadas parvus Bate, 1881
Fig. 9
Gennadas parous Bate, 1881: 192; 1888: 340, pI. 59. Kemp, 1909: 721, pI. 73, figs 1-6, pI. 75,
fig. I; 1913: 60, pI. 7, fig. 6. Burkenroad, 1936: 65. Tirmizi, 1960: 346, figs 49,5?.
Amalopenaeus parous: Balss, 1927: 263, figs 20-23.
Description
Antennal and infra-antennal angles acute. Spine on outer scaphocerite
margin small, below apex of scale. Thelycum of female with broad shield on
8th thoracic sternite with 2 depressions on either side of slight median ridge.
7th sternite with broad-based triangular shield. Rectangular structure beneath
apex of triangle made up of3 plates. Leaf-like process between bases of3rd and
4th pereiopods. Petasma of male with bipartite external lobe, outer lobule
hook-like, inner lobule broad, truncate. Median lobe bipartite, with elongate
outer lobule, and broader inner lobule at right angles to former. Short blunt
process between external and median lobes. Internal lobe distally elongate,
rounded, with numerous hooks. Accessory lobe a mere ridge beneath median
lobe.
Fig. 9. Gennadas parvus
a. Petasma. b. Thelycum. c. Apex of scaphocerite. d. Antennal and infra-antenna! angles.
e. Appendix masculina.
Distribution
Indo-Pacific, off Cape of Good Hope.
Material
Station Position Depth (metres) C.L.(J (mm) C.L.~ (mm)
AI892 36.28 S, 41.22 E 1000 5,4 5,8
AI896 34.12 S, 28.24 E 1000 5,9
A2394 44.40 S, 26,05 E S 6,2 6,4
6,5
5,8
A2961 40.12 S, 14.41 E 700 6,2
6,9
A2965 40.17 S, 19.54 E 600 6,8
A2966 38.09 S, 19.50 E 600 6,8
A3616 31.19S,lo.08E 250 5,2
A3634 33.23 S, 09.31 E 250 6,4
6,6
A3643 36.51 S, 12.43 E 250 5,0
Gennadas scutatus Bouvier, t 906
Fig. 10
Gennadas scutatus Bouvier, 1906: 748; 1908: 42, pI. 8. Kemp, 1909: 727, pI. 75, fig. 2; 191Oa:178,
pI. 13, figs 9, 10; 1913: 61. Caiman, 1925: 4. Burkenroad, 1936: 83, fig. 59. Barnard,
1950: 634, fig. 1180, p. Tirmizi, 1960: 358, fig. 40C,48d, 67-69. Crosnier & Forest, 1969:
549? .
Amalopenaeus scutatus: Balss, 1927: 258, figs II, 12.
Description
Antennal and infra-antennal angles acute. Spine on outer scaphocerite
margin reaching beyond apex of scale. Thelycum of female with elongate flap
on 8th thoracic sternite, stretching forward to cover 7th and 6th sternites.
7th sternite a flattened triangle. 6th sternite triangular with seminal receptacles
visible under flap of 5th sternite. Petasma of male with external lobe of 2 short
rounded lobules. Median lobe broad, consisting of slender outer lobule, and
inner broadly rounded lobule with tiny lobe on outer margin. Internal lobe
of 2 low rounded hook-covered portions. Accessory lobe a simple triangular
flap.
Distribution
North and South Atlantic, Caribbean, entire Indo-Pacific region.
Material
Station
IK6
Position
34S,17E
Depth (metres)
200
C.L.(J (mm)
5,4
5,1
5,4
5,4
C.L.~ (mm)
5,0
4,9
5,3
Station
A321
A2953
Position Depth (metres) C.L.J (mm)
34.33 S, 16.42 E 3200-3400
44.24 S, 20.16 E 600 5,1
C.L.r;;. (mm)
5,8
Fig. 10. Gennadas scutatus
a. Petasma. b. Thelycum. c. Apex or'scaphocerite. d. Antennal and infra-antennal angles.
e. Appendix masculina.
Gennadas talismani Bouvier, 1906
Fig. II
GmtUUlas talisman; Bouvier, 1906: 10, fig. 15; 1908: ll8. Lenz & Strunck, 1914: 311, pI. 18, figs
1-14. Burkenroad, 1936: 66, 85, fig. 60. Barnard, 1950: 633, fig. 118i,j. Crosnier & Forest,
1969: 549.
Arna/opentuus talisman; .? Balsa, 19l17:ll54, figs 5-7.
Description
Antenna! and infra?antennal angles acute. Thelycum in female with shield
on 8th thoracic sternite notched anteriorly and posteriorly. 7th sternite with
broadly rectangular plate, with anterior ridge marking position of seminal
receptacles. Petasma in male with external lobe consisting of 2 low apically
acute lobules. Median lobe bipartite, outer lobule broad, inner lobule slender.
Interior lobe rounded. Accessory lobe a broad flap.
Distribution
North and South Atlantic, not as yet known from southern Mrican waters.
>:5, r:????.' . .. . .. .. . .. .b .,< ... ..-:~
Fig. 1 I. Gennadas talismani
a. Petasma (after Balss, 1927, and Bouvier, 1906). b. Thelycum (after Balss, 1927, and
Burkenroad, 1936).
Gennadas tinayrei Bouvier, 1906
Fig. 12
GennadastinayreiBouvier, 1906: 10,figs2-4, 14; 1908,48, pI. I, fig. 4, pI. lo.Stephensen, 1923: II.
Burkenroad, 1936: 73, .fig. 56. Tirmizi, 196o: 367, figs 40?' 81-83.
Amalopenaeus tinayrei: Sund, 1920: 29. Balss, 1927: 252, fig. 2, pI. 6, fig. I.
Description
Antennal angle subacute, infra-antennal angle acute. Spine on outer
scaphocerite margin just reaching apex of scale. Thelycum offemale with small
rectangular shield on 8th thoracic sternite. 7th sternite with broad-based
triangular shield, with 2 rounded processes on either side of apex. 5th thoracic
sternite with tongue-like median process, posteriorly directed. Petasma in
male with external lobe apically divided into 2 low subapical lobules, bearing
several small blunt hooks, and with small lobe at base. Median lobe broad
evenly convex. Internal lobe consisting of 2 round~d hook-covered portions.
Accessory lobe broadly rounded.
Distribution
Indian Ocean, North and South Atlantic.
Material
Station
A2953
A4218
Position Depth (metres)
44.24 S, 20.16 E 600
29.13 S, 10.03 E 100
C.L.,:! (mm)
6,0
6,9
7,0
Fig. 12. Gennadas tinayrei
a. Petasma. b. Thelycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles.
e.?Appendix masculina.
Gennadas valens (Smith, 1884)
Fig. 13
Amalopenaeus valens Smith, 1884: 402, pI. 10, fig. 2. Balss, 1927: 253, fig. 4.
Gennadas volens: Bouvier, 1908: 34, pI. I, fig. 3, pI. 9. Stephensen, 1923: 12. Burkenroad, 1936:
75, fig. 57. Barnard, 1950: 631, fig. 118k, I.
Description
Antennal and infra-antennal angles acute. Spine on outer scaphocerite
margin reaching slightly beyond apex of scale. Thelycum in female with
almost circular shield on 8th thoracic sternite. 7th thoracic sternite with
2 anteriorly-directed. triangular processes, anterior end of same sternite with
semi-circular raised area. Seminal receptacles just posterior to similar raised
area on 6th sternite. Coxa of 4th pereiopod with medially-directed lobe, bearing
smaller tooth-like process on anterior margin. Petasma in male with external
lobe bipartite, inner lobule smaller than outer. Median lobe consisting of 3
blunt sub-equal lobules. Internal lobe of 2 rounded hook-covered portions.
Accessory lobe larg~, rounded.
c d
Fig. 13. Gennadas valens
a. Petasma. b. The1ycum. c. Apex of scaphocerite. d. Antennal and infra-antennal angles.
e. Appendix masculina.
Distribution
North and South Atlantic, Caribbean.
Material
Station
A3634
A3641
Position Depth (metres)
33.23 S, 09.31 E S
37.00S, 08-40E S
C.L.~ (mm)
9,8
10,0
C.L.J (mm)
7,9
II,2
7,9
10,1
10,0
10,0
9,2
8,0
SUMMARY
The South African representatives of the penaeid genus Gennadas are
discussed. Thirteen species have been recorded from the area, eleven of which
(including four new records) are represented in the present collection. The
species are figured, and brief descriptions are given, to assist with their
identification.
ACKNOWLEDGEMENTS
My grateful thanks are due to the following scientists for allowing me to
examine material: the Director of the Division of Sea Fisheries, Cape Town;
Professor ]. H. Day of the University of Cape Town; Dr.]. R. Grindley and
Mr. M.]. Penrith for material collected while they were both attached to the
South Mrican?Museum.
BALSS,H. 1927. Macrura der Deutschen Tiefsee-Expedition. 3. Natantia, Teil B. Wiss. Ergebn.
dt. Tieftee-Exped. 'Valdivia' 113:245-275.
BARNARD,K. H. 1950. Descriptive catalogue of South African decapod Crustacea (crabs and
shrimps). Ann. S. Afr. Mus. 38: 1-837.
BATE, C. S. 1881. On the Penaeidea. Ann. Mag. nat. Hist. (5) 8: 169-195.
BATE, C. S. 1888. Report on the Crustacea Macrura collected by H.M.S. Challenger during the
years 1873-1876. Rep. Voy. Challenger 1873---1876114: 1-942.
BOUVIER,E.-L. 1905. Sur les macroures nageurs (abstraction faite des carides) recueillis par les
expeditions americaines du 'Hassler' et du 'Blake'. C. r. hebd. Seanc. Acad. Sci., Paris 141:
746-749?
BOUVIER,E.-L. 1908. Crustaces decapodes (Peneides) provenant des campagnes de I'Hirondelle
et de la Princesse-Alice (1886-1906). Result. Camp. scient. Prince Albert I 33: 1-122.
BURKENROAD,M. D. 1936. The Aristaeinae, Solenocerinae and pelagic Penaeinae of the
Bingham Oceanographic Collection. Bull. Bingham oceanogr. Coli. 5 (2): 1-151.
CALMAN,W. T. 1925. On macrurous decapod Crustacea collected in South African waters by
the s.s. 'Pickle' Rep. Fish. mar. bioi. Surv. Un. S. Afr. 4 (Spec. Rep. 3): 1-26.
CROSNIER,A. & FOREST,J. 1969. Note preliminaire sur les peneides recueillis par I' 'Ombango',
au large du plateau continental, du Gabon it I'Angola (Crustacea Decapoda Natantia).
Bull. Mus. natn. Hist. nat., Paris (2) 41: 544-554.
KEMP, S. 1909. The decapods of the genus Gennadas collected by H.M.S. 'Challenger'. Proc.
zool. Soc. Lond. 1909: 718-729.
KEMP, S. 1910a. Notes on Decapoda in the Indian Museum. I. The species of Gennadas. Rec.
Indian Mus. 5: 173-181.
KEMP, S. 191Ob.The Decapoda Natantia of the coasts of Ireland. Scient. Invest. Fish. Brch Ire.
IgoB (I): 1-190.
KEMP, S. 1913. Pelagic Crustacea Decapoda of the Percy Sladen Expedition in H.M.S. 'Sealark'.
Trans. Linn. Soc. Lond. (2, Zoo!.) 16: 53-68.
KENSLEY,B. F. 1968. Deep sea decapod Crustacea from west of Cape Point, South Mrica.
Ann. S. Afr. Mus. 50: 283-323.
KENSLEY,B. F. 1969. Decapod Crustacea from the south-west Indian Ocean. Ann. S. Afr. Mus.
511:149-181.
LENZ, H. & STRUNCK,K. 1914. Die Dekapoden der Deutschen Stidpolar-Expedition 1901-1903.
I. Brachyuren und Macruren mit Ausschluss der Sergestiden. Dt. Sildpol.-Exped. 7: 257-346.
MAN, J. C. DE. 1907. Diagnoses of new species of macrurous decapod Crustacea from the
Siboga Expedition. Notes Leyden Mus. 119: 127-147.
SMITH, S. I. 1882. Reports on the results of dredging, under the supervision of Alexander
Agassiz on the east coast of the United States, during the summer of 1880, by the U.S.
Coast Survey steamer 'Blake', Commander J. R. Bartlett, U.S.N., commanding. XVII.
Report on the Crustacea. Part I. Decapoda. Bull. Mus. compo Zool. Harv. 10: 1-108.
SMITH,S. I. 1884. Report on the decapod Crustacea of the 'Albatross' dredgings off the east
coast of the United States in 1883. Rep. U.S. Commnr Fish. IO (2): 345-426.
STEBBING,T. R. R. 1914?1.Stalk-eyed Crustacea Malacostraca of the Scottish National Antarctic
Expedition. Trans. R. Soc. Edinb. 50: 253-308.
STEBBING,T. R. R. 191?. South Mrican Crustacea. Ann. S. Afr. Mus. IS: I-55.
STEBBING,T. R. R. 1917. South Mrican Crustacea. Ann. S. Afr. Mus. I7: 23-46.
STEPHENSEN,K. 1923.Decapoda-Macrura (excl. Sergestidae). Rep. Dan. oceanogr. Exped. Mediteff.
2 (D.3): 1--85.
SUND,O. 1920. Peneides and Stenopides from the 'Michael Sars' North Atlantic Deep-sea
Expedition 1910. Rep. scient. Results Michael Sars No Atlant. deep Sea Exped. 3 (2): 1-32.
TIRMIZI,N. M. 1960. Crustacea: Penaeidae, Part II. Series Benthesicymae. Scient. Rep. John
Murray Exped. IO: 319-383.
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THIELE,J. 1910. Mollusca: B. Polyplacophora, Gastropoda marina, Bivalvia. In SCHULTZE,L.
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