Nannastacidae (Crustacea: Cumacea) from the Malayan shallow waters (South China Sea)

43 Pages·1997·2.3 MB·English

by  Petrescu, Iorgu

Beaufortia
INSTITUTE FORSYSTEMATICSAND POPULATIONBIOLOGY
(ZOOLOGICAL MUSEUM)UNIVERSITYOF AMSTERDAM
Vol. 47, no. 4 December 19, 1997
Nannastacidae(Crustacea: Cumacea) fromtheMalayanshallow
waters (South ChinaSea)
IorguPetrescu
"GrigoreAntipa"NationalMuseumofNaturalHistory Kiseleff1,Bucharest79744, Romania
,
Keywords: Nannastacidae,Cumacea,SouthChina Sea
Abstract
Four newspecies from the South China Sea are described: Nannastacusmuelleri n.sp.,Nannastacus wissenin.sp., Scherocumella
fagein.sp.andScherocumellamalayensisn.sp. The descriptions offurther 15 known species arecomplemented with newinfor-
mation (CampylaspisamblyodaGamo, 1960,Cumella canaHale, 1945, C. hispidaCaiman, 1911,C. indosinica Zimmer, 1952,C.
similis Fage, 1945, Nannastacusantipai Petrescu, 1995,N.gamoiBăcescu, 1992,N.gibbosusCalman, 1911,N.goniatusGamo,
1962, N. inconstansHale, 1945,N. mitreaePetrescu, 1995, N.pectinatus Gamo, 1962, Scherocumellanasuta (Zimmer, 1914),
SchizotremadepressumCalman, 1911 and S.sakaiiGamo, 1964).No Cumacea have been reported from the areaasyet.
INTRODUCTION MATERIAL AND METHODS
TheCumacea from the South China Sea and The samples including 1045 specimens were
West Pacific are partially known. Species have collected quantitatively with a handnetby H. G.
been described from the coasts ofSouth - East Miiller from4 stations:
Asia (Japan, China, Vietnam, Thailand), Indo- MAS- 2 Pulau Babi Besar, about 15 km off
nesia and especially from Australia. There are Mersing; reef-flat near sandy beach; in and
no data about Cumacea from the Malayan under dead coral rocks, lower intertidal, 1.4.
coasts. The present contribution deals with a 1991.
collection from the shallow waters of Malaysia MAS- 3 Pulau Babi Besar, about 15 km off
(from the reefs around Mersing) made by Dr. Mersing; central part of reef-flat; in and under
Hans-Georg Miiller(Germany) who kindly deadcoral rocks, mainly covered with coralline
offered it to me. algae, intertidal, 1 m, 1.4.1991.
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Fig. 1.MapofMalaysia withthecollectinglocality (Mersing).
MAS - 6 Pulau Babi Besar, about 15 km off (including 4 new species) belong to the family
Mersing; outer reef-flat and reef-margin; dead NannastacidaeBate, 1866.
corals (Acropora sp., Pocillopora damicornis) covered
with algae, sponges, hydroids and ascidians, 1-2 Campylaspis amblyoda Gamo, 1960(Fig. 2)
m , 2-9.4.1991.
MAS - 16 Pulau Tioman, about 60 km off Material: 1 female, stat. MAS-3; 2 females, stat
Mersing; coral substrate of fringing reef, 1-3 m, MAS-6; 10 females, 1 male and 1 juvenile, stat
12-17.4.1991(Fig. 1) MAS-16.
The type materialis deposited in the Zoolo-
gical Museum, University ofAmsterdam(ZMA), Description: Female body size: 2.01 mm. Gamo's
"Grigore Antipa" National Museum of Natural description doesnot contain any reference to the
History, Bucharest (GANMNH) and at the mouth parts. Mandible (Fig. 2 C), pars incisiva
University of Singapore (US).The remaining with 5 flattenedshort teeth, lacinia mobilis with
material is deposited in the collections of the 4flattened shortteeth; 3 spine-like plumose setae
museum ofBucharest. between lacinia mobilis and pars molaris; a
sharp, styliform pars molaris characteristic for
RESULTS the genus. Maxilla 1 (Fig. 2 D), protopod with 7
spines (5 bifid and 2 simple ones); endite with 4
All 5 genera and 19 species described below plumose setae; long palp with one filament.
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Fig. 2. Campylaspis amblyoda Gamo, 1960,A - H: female;I: male. A:body, lateralview;B: cephalothorax andfree thoracic
segments,dorsalview; C: mandible;D: maxilla 1;E: maxilla 2; F: maxilliped 1;G: maxilliped2; H:pereopod 1; I:pereo-
pod2;J:uropod; K: uropod. Scale bars (inmm):A, B:0.5; C- G: 0.1;H - K:0.1.
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Fig. 3. Cumella (Cumella) canaHale, 1945,female.A:body,lateralview; B:cephalothorax and free thoracic segments,dor-
salview; C: antenna 1;D: mandible; E:maxilla 1;F: maxilla 2;G:maxilliped 1;H:maxilliped2; I: maxilliped3;J: pereo-
pod 1;K.:pereopod 2; L:pereopod 3. Scalebars (inmm): A:0.3;B:0.2;C,G - I:0.1; D-F: 0.05; J- L:0.15.
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Fig. 4. Cumella (Cumella)canaHale, 1945,A - C: female;D - M: male. A: pereopod 4;B: pereopod5; C: uropod; D: body,
lateralview; E:cephalothorax and freethoracicsegements, dorsalview; F: antenna 1;G: maxilliped 3; H: pereopod 1;I:
pereopod2; J:pereopod 3;K:pereopod 4;L:pereopod 5; M: uropod. Scale bars(inmm):A-C, H -M:0.15; D, E:0.2; F,
G:0.1.
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Fig. 5. Cumella (Cumewingia) hispidaCalman, 1911,female.A: body,lateral view;B: carapace,dorsalview;C: antenna 1;D:
antenna 2; E:mandible; F: maxilla 1;G: maxilla 2; H: maxilliped 1; I:maxilliped 2;J: maxilliped 3; K: pereopod 1; L:
pereopod 2;M:pereopod3. Scale bars (in mm):A: 0.5;B:0.3;C, D, E,G - I:0.1;F:0.05; J:0.15;K -M:0.2.
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Maxillla 2 (Fig. 2 E), narrow protopod with 4 basis with 2 plumose long setae on outer distal
simple setae. Maxilliped 1 (Fig. 2 F), with 2 corner; bulky merus witharounded hairy hump
hook-like spines on endite of basis as usual for on inner margin; 2 small setae on outer margin
thegenus. of carpus; 2 simple setae on distal inner corner
and 2 plumose ones on outer distal corner of
Remarks: Ourspecimens are very similar to those carpus; dactylus as longas its claw.
fromJapan, but there are a few differences:
female - carpus ofmaxilliped 2 (Fig. 2 G) with 2 Remarks: There are a few differences with the
teeth on outer margin versus 1;merus ofpereo- Australianspecimens: female - integument finely
pocl 1 as long as carpus versus merus longer granulose butalso with fewhairs (Fig. 3 A), cara-
thancarpus (Fig. 2 H); carpus ofpereopod 2 pace(Fig. 3 B) with club-like setae on its anterior
(Fig. 2 I) with 2 short simple setae in outer distal half; maxilliped 3 (Fig. 3 I) with hairs and
corner versus aplumose one; uropodal peduncle plumose setae on outer margin ofbasis (Flale's
(Fig. 2 J) with hairs instead of5 small spines on specimens withaserrate innermargin on its dis-
the inner edge; endopod just alittle longer than tal half, terminal spine shorter than dactylus
exopod, with longer spines on inner margin; (versus longer), more hairy pereopods 3-5 (Fig. 3
male - uropodal peduncle (Fig. 2 K) with more K), uropodal endopod (Fig. 4 C) with 3 subter-
numerous plumose setae on inner margin (10 minalspines insteadof 4; male- the same club-
versus 7); endopod with fewer spines on inner like setae on carapace (Fig. 4 E); maxilliped 3
margin (6 versus 10). (Fig. 4 G) with teeth on the outer distal corner
of basis, basis shorter than the rest ofmaxilliped
Cumella(Cumella) canaHale, 1945 (longer in Hale); pereopod 1 (Fig. 4 H), more
(Figs 3, 4) hairy, dactylus with longer terminalsetae; pereo-
pod 2 (Fig. 4 I) with shorter basis and longer
Material: 14 females, 1 male, stat. MAS-2; 14 dactylus; little longer uropodal rami (rami:
females, 3 males, stat. MAS-3; 11 females, 1 peduncle= 0.75versus 0.66) (Fig. 4M).
male, stat. MAS-6; 13females, stat. MAS-16. The species belongs to the subgenus Cumella
Sars, 1865 because the male pseudorostrum is
Description: Body size: 1.30 mm (females), 1.18 without lenses.
mm (males). Cumella canawas firstly described by
Hale in 1936 as C. laeve (Caiman, 191 1). He Cumella (Cumewingia) hispida Calman,
redescribed it and established its status as anew 1911(Figs 5, 6)
species - Cumella cana Hale (1945). I complete
both descriptions with the following parts: Material: 10 females, 4 males, stat. MAS-2; 22
mandible(Fig. 3 D), pars incisiva with 3 teeth, females, 15 males, stat. MAS-3; 42 females, 8
small lacinia mobilis with 3 teeth (the middle males, stat. MAS-6; 18 females, 2 males, stat.
one, the longest); 6 spine-like simple setae MAS-16.
between lacinia mobilis and pars molaris; trun-
cated pars molaris with a small tubercle on its Description: Descriptions and illustrations of this
anterior corner; maxilla 1 (Fig. 3 E), long proto- species were done by Caiman (1911), Stebbing
pod with 8 simple spines; endite with 4 simple (1913), Fage (1945) and Hale (1945), but all of
setae; short palp with 2 unequal glabrous fila- them are incomplete. Only the shape of body,
ments; maxilla 2 (Fig. 3 F), truncated, with 2 carapace, antenna 1, pereopods 3-5 and uropod
unequal endites, that never exceed the top of are mentioned. So, I add the remaining parts.
protopod; maxilliped 1 (Fig. 3 G), endite ofbasis Female -(Figs 5, 6 A-C) - Antenna 2 (Fig. 5 C)
with a tooth-like spine, 2 hook-like spines and 4 with 2 unequal long plumose setae. Mandible
simple setae on outer margin; 8 bifid flattened (Fig. 5 E), pars incisiva with 3 teeth, lacinia
spines mixed with simple setae on outer margin mobilis with 3 teeth (the middle one longest)
of carpus, a plumose seta in distal inner corner exceeds pars incisiva , 5 simple spine-like setae
ofcarpusand propodus; maxilliped 2 (Fig. 3 H), between lacinia mobilis and pars molaris, 2
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Fig. 6. Cumella(Cumewingia)hispidaCalman, 1911,A - C:female; D - M:male.A:pereopod 4; B:pereopod5;C: uropod; D:
body,lateral view; E:carapace, dorsalview;F:antenna 1;G: maxilliped3; H: pereopod 1;I:pereopod 2;J: pereopod 3; K:
pereopod4;L:pereopod 5; M:uropod.Scale bars (in mm):A - C,G - L:0.2; D:0.5;E, M: 0.25;F:0.15.
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small tubercles between those setae and pars Cumella(Cumewingia) indosinica
molaris (on outer margin), truncated pars Zimmer, 1952(Fig. 7)
molaris with a strong tooth on outer margin.
Maxilla 1 (Fig. 5 F), protopod with 7 simple Material:2 males, stat.MAS-3.
spines, aplumose seta on inner margin, endite
with 4 plumose setae, palp as long as protopod Description: This is the first record of the species
with 2 unequal filaments. Maxilla 2 (Fig. 5 G) after its description by Zimmer from the waters
truncated, top endite exceeds protopod. of Vietnam and Cambodia in 1952. This
Maxilliped 1 (Fig. 5 H), basis with 4 hand- like description and illustration contains only the
spines and 3 simple setae on outer margin, its body, pereopods 1 and 5and uropods. Antennae
endite with 2 setae, a flattened hook-like spine (Fig. 7 A,B), as usual for the genus. Mandible
and 2 smaller hook-like ones; 8 bifid flattened (Fig. 7 C), pars incisiva with 3 teeth, lacinia
spines mixedwith simple setae on outer margin mobilis 3 unequal teeth,5 spine-like simple setae
of carpus; merus, carpus and propodus with an between lacinia mobilis and pars molaris, 2
innerridge, a plumose long seta on innerdistal small tubercles between those setae and pars
corner; dactylus shorter than its terminal setae. molaris, pars molaris with a tooth on anterior
Maxilliped 2 (Fig. 5 1), short basis with 2 long corner. Maxilla 1 (Fig. 7 D) with 8simple spines
plumose setae on outer distal corner, broadened on protopod; endite with 4 simple setae; palp as
merus, carpus and propodus, a long plumose long as protopod, with 2 glabrous filaments.
seta on inner distal corner and 3 plumose setae Maxilla 2 (Fig. 7 E), as usualfor the genus, upper
on outer distal corner ofpropodus, dactylus endite exceeds protopod. Maxilliped 1 (Fig. 7 F),
shorter than its claw. Male- antenna 2(Fig. 6F), basis with 4 plumose setae on outer margin, 2
its flagellum does not exceed the 5th pleonite. hook-like spines and a bifid one on top of its
Maxilliped 3 (Fig. 6 G)with atooth on outer dis- endite; 8 bifid flattened spines on outer margin
tal corner of basis, another stronger one on ofcarpus; dactylus as long as its claw.Maxilliped
innermargin of merus; dactylus shorter than its 2 (Fig. 7 G), basis with 2 unequal plumose setae
claw Pereopod 1 (Fig. 6 H) with a hyaline ridge on its distal outer corner (one ofthem exceeds
on inner margin ofbasis (distal half), carpus carpus), merus with hairs on inner margin, car-
longer than propodus, propodus longer than pus with hairs and 2 plumose short setae on
dactylus, dactylus shorter than its claw.Pereopod outer andone oninnerdistal margin, dactylus as
2 (Fig 6 I) with a hyaline ridge on theinner mar- long as its claw. Maxilliped 3 (Fig. 7 H), a little
gin ofbasis, longer than 1/3 of theentire pereo- curved, longer than halfof the maxilliped, with
pod, carpus a little longer than merus and 2 unequal plumose setae on its process and a
propodus, 3 unequal simple setae (the middle tooth on its distal outer corner, slender articles,
one the longest), short dactylus (dactylus: propo- dactylus alittle shorter than its claw. Pereopod 2
dus= 1.1), 3 terminal setae spines shorter than (Fig. 7J), basis witha hyaline creston innermar-
dactylus. Pereopods 3, 4 (Fig. 6J, K) withstrong, gin, longer than halfof the pereopod, simple
broadened basis, longer than 1/3 of the entire setae on basis, merus and carpus; dactylus 2
pereopod, carpusas longas propodus. times longer than propodus, with 2 small spines
on outer margin, oneon innermargin and 3 ter-
Remarks: There are a few differences regarding minal spines, shorter than dactylus. Pereopod 3
especially the carapace: females could have 2-4 and 4 (Fig. 7 K,L) with strong basis, basis of
small teeth (4 in the biggest, ovigerous ones); pereopod 3 longer than halfof pereopod, basis
immature males with 1-2 median dorsal teeth, ofpereopod 4,shorter.
integument ofthe whole body with club- like Remarks: Body with a granular integument. Few
setae more numerous on carapace (Fig. 6 D, club-like setae on carapace, fewer than in C.
E).The males have lenses on pseudorostrum, so hispida. Pseudorostrum with a pair oflenses (the
the species belongs to the subgenus Cumewingia species belongs to the subgenus Cumewingia).
Bacescu, 1971. Body, pereopods 1 and 5 like in Zimmer's
description (Fig. 7 I, M). Uropodal peduncle
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Fig. 7. Cumella(Cumewingia) indosinica Zimmer, 1952,male. A:antenna 1;B:antenna2; C: mandible;D: maxilla 1;E:maxil-
la 2;F: maxilliped 1; G: maxilliped 2; H: maxilliped 3;I:pereopod 1;J: pereopod 2;K; pereopod 3;L: pereopod 4; M:
pereopod5;N: uropod. Scalebars (in mm): A,B,F, G:0.1; C - E:0.05;H,N:0.15;I-M:0.2.
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