On two new species of Thalamita Latreille, 1892 (Crustacea, Decapoda, Brachyura, Portunidae) from China

2008·0.35 MB·

Acta Zootaxonomica Sinica, 33 (4) : 645- 649 ( Oct., 2008) ISSN1000(cid:1)0739
动物分类学报
ON TWO NEWSPECIES OF THALAMITA LATREILLE, 1892 ( CRUSTACEA,
DECAPODA, BRACHYURA, PORTUNIDAE) FROM CHINA
CHENHui(cid:1)Lian1, YANGSi(cid:1)Liang2,3
1. Instituteof Oceanology, ChineseAcademyof Sciences, 7Naihai Road, Qingdao(cid:1) 266071China
2. BeijingNaturalHistory Museum, Beijing(cid:1) 100050, China
3. Jiangsu ProvincialKeyLaboratory of CoastalWetlandBioresourcesandEnvironmentalProtection, YanchengTeachersCollege, YanchengCity, JiangsuProvince(cid:1) 224002, China
Abstract(cid:1) Twonewspecies of portunidcrabsarereported fromtheSouthChina Sea, viz. Thalamita acanthophallus and T. xishaensis
(Portunidae, Thalamitinae). Their affinitieswith allied taxa are discussed in thispaper.
Key words(cid:1) Portunidae, Thalamita, newspecies, South China Sea.
1(cid:1) Introduction Epibranchial ridge sinuous, extending to base of
epibranchial tooth, separated from metagastric ridge by
The portunid genus Thalamita Latreille, 1829 is one
cervicalgroove. Cardiacregionwithsinuous ridge. Front
of the largest genera in the subfamily Thalamitinae
cut into 6 lobes: median ones rounded, separated by a
Paulson, 1875, with over 90 described species
V(cid:1)shaped notch, lying on a lower plane and distinctly
(Edmondson, 1925, 1951; 1954; Montgornery, 1931;
narrower than first lateral lobe; second lateral lobe
Leene, 1938; Stephenson & Hudson, 1957; Crosnier,
narrowest, bluntly angular. Supraorbital lobes short,
1962; 1975, 1984, 2002; Stephenson & Rees, 1967;
arched. Anterolateral margin with 4 sharp teeth
Stephenson, 1972; 1975; Dai & Yang, 1991; Wee &
(including outer orbital tooth) ; decreasing fromfront to
Ng, 1995; Moosa, 1995 Apel & Spiridonov, 1998, Ng
rear in breadth; last one smallest, directed
etal., 2008). Members ofthegenusarewell represented
in the East China Sea and South China Sea ( Sakai, anterolaterally. Posterolateral margin longer than
anterolateral margin, slightly converging backwards.
1976; Dai etal., 1986; Dai&Yang, 1991; Wee&Ng,
Posterior margin straight, joining posterolateral margin as
1995; Dai, Cai &Yang, 1996; Ng et al., 2001). As a
part of our ongoing studies on the Portunidae fauna of curved margin. Antennal basal segment narrower than
China, we recently examined the material in the orbital breadth, with granular crest.
collections of the Institute of Oceanology, Chinese Third maxillipedwith exognath broader; about 0(cid:2)5
times breadth of ischium. Merus shorter than ischium,
Academy of Sciences ( Qingdao) and Beijing Natural
History Museum. Two specimens of Thalamita from the subquadrate, about as long as broad with outer(cid:1)distal
South China Sea are proved to be new, and are here angle rounded, notproduced.
described. Chelipeds covered with granules on outer surface.
The abbreviation G1 is used for the male first Carpus with 3 spines on outer surface and a stout, short
gonopod. Measurements ( in millimeters ), are of spine atinner(cid:1)distal angle. Palm armed with 5 spines on
carapace length by carapace width. The type specimens dorsal surface, of which distal spine smaller; with 2
are deposited in the Collections of the Institute of longitudinal ridges on outer surface. Fingers shorter than
Oceanology, Chinese Academy of Sciences (IOCAS). palm, cutting edges with unequal blunt teeth. Propodus
of natatory leg bearing 5 spines; dactylus ovate with
2(cid:1) Taxonomy
spiniform tip.
Family Portunidae Rafinesque, 1815 Male abdomen with third to fifth segments
completely fused. Sixth segment trapezoidal, about 1(cid:2)5
Genus Thalamita Latreille, 1829
times as broad as long, with lateral margin parallel in
Thalamita acanthophallus sp. nov. (Figs(cid:2)1(cid:1)7)
proximal half and arched in distal half, breadth of basal
Material examined. Holotype, male (7(cid:2)5 by 11(cid:2)5 margin about 1(cid:2)5 times as distal margin, Telson
mm), IOCAS(cid:1)C01043, ChenhangIsland, Xisha Islands triangular, about as long as broad, with blunt tip.
(16(cid:2)18(cid:2)N, 111(cid:2)42(cid:2)E), coll. Zh. G. Fan, 26 Apr. G1 stout, arched, tapering to tip; distal portion
1958. with numerous spinules arranged into a few longitudinal
Diagnosis. Carapace about 1(cid:2)5 times as broad as rows.
long. All anterior carapace ridges present: frontal and Etymology. The name acanthophallus is derived
protogastric ridges short; mesogastric ridge longer, from the Greek for a spiny male reproductive organ
interrupted medially; metagastric ridge short, straight. (phallus), and refers to the numerous spines in distal
Received6June2008, accepted3 Sep. 2008.
645
(cid:1) 6(cid:1)46(cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) ActaZootaxonomica Sinica 动物分类学报(cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Vol. 33(cid:1) No. 4
(cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1)
Figs(cid:2)1(cid:1)7. Thalamitaacanthophallus sp. nov. 1. Carapace. 2. Antennalbasalsegment. 3. Thirdmaxilliped. 4. Chela. 5. Last
3segmentsof natatoryleg. 6. Maleabdomen. 7. G1. Fig(cid:2)8. G1 of Thalamitamultispinosa. Scale bars= 1mm, exceptwhere
indicated otherwise.
portion of the male first gonopod. margin, the fourth tooth being small or rudimentary
Taxonomic remarks. In general morphology, T. ( Stimpson, 1858; Stephenson & Rees, 1967;
acanthophallus sp. nov. is most similar to T. danae Stephenson, 1975; Crosnier, 2002) . In thenewspecies,
Stimpson, 1858, T. multispinosa Stephenson & Rees, there are only four anterolateral teeth without trace of a
1967, and T. holthuisi Stephenson, 1975, in its fifth. In addition, the G1 of T. acanthophallus is
prominently separated six frontal teeth, and the entire distinctly stouter and shorter, taperingtoa blunt tip, and
first anterolateral tooth. The latter three species, its distal portion bears numerous spines, arranged
however, arearmedwithfive teethalongtheanterolateral backwards in a few longitudinal rows. The G1 of T.
Oct., 2008 陈惠莲等: 中国短桨蟹属 (十足目, 短尾次目, 梭子蟹科) 二新种 647 (cid:1)
danae, T. multispinosa and T. holthuisi are distinctly 20 spines on anterior border and 4 spines on posterior
slender. Moreover the G1 of T. multispinosa has a flared border; tip spiniform.
tip (Fig(cid:2)8); the G1 of T. danae has only a row of Male abdomen with third to fifth segments
bristles on the inner surface of the distal portion besidesa completely fused. Sixth segment trapezoidal, clearly
clump of bristles on the outer surface ( Stephenson and broader than long, with lateral margin slightly arched,
Hudson, 1957: figs. 2N, 3N; Dai &Yang, 1991: fig. breadth of basal margin about 1(cid:2)3 times length of distal
134 (2); Wee& Ng, 1995: figs. 42G(cid:1)I); and the G1 margin. Telson triangular, tip blunt.
of T. holthuisi has 7 short stout bristles followed by 6(cid:1)12 G1stout, distal portion flared, outer surface of tip
elongate bristles on outer side of the subterminal portion with 7 long spines and a few small spines; inner surface
and extending to underside, and the inner side with 10(cid:1) with 2 small spines.
15 spines forming an extended row (Stephenson, 1975: Ecology. Inhabits sand and rocky bottom along the
figs. 4D(cid:1)F) . T. acanthophallus sp. nov. alsodiffersfrom coast, in coral reef, and in shallow water.
the latter 3 species by having the sixth segment of the Etymology. Namedinreferenceto thetypelocality.
male abdomen distinctly shorter. Taxonomic remarks. Thalamita xishaensis sp. nov. is
perhaps most similar to T. nanshaensis Dai, Cai &Yang,
Thalamita xishaensis sp. nov. (Figs(cid:2)9(cid:1)16)
1996, and T. wakensis Edmondson, 1925
Material examined. Holotype male ( 8(cid:2)1 by 13(cid:2)5 ( Edmondson, 1925; Dai, Cai & Yang, 1996;
mm), IOCAS(cid:1)C01042, YongxingIsland, Xisha Islands Crosnier, 2002). It differs from T. nanshaensis in the
(16(cid:2)50 N, 112(cid:2)20 E), coll. CHEN, Hui(cid:1)Lian, 5 June following: 1) the carapace is covered with granules on
1981. mostparts of the dorsal surface [ versus granules present
Diagnosis. Carapace about 1(cid:2)7 times as broad as only on thefront and anterolateral portions of the dorsal
long, densely covered with granules and setae. surface (Dai, Cai & Yang, 1996: figs. 5(cid:1)1)]; 2) the
Protogastric and mesogastric ridges distinct; metagastric merus of the cheliped is stout and short, the palm
ridge short, straight, separated from epibranchial ridge possessing five spines on the dorsal surface, and the
bycervical groove. Epibranchial ridge extending to base movable finger is equal to the dorsal border of the palm
of epibranchial tooth. Cardiacand mesobranchial regions [ versus the merus ofthechelipediselongateand slender,
each with a ridge. Front cut into 4 lobes: median lobes the palmhasjusttwo spines andafew tinyteeth, andthe
straight, inclined laterally outward, separated by a deep movablefinger is distinctly longer than the dorsal border
V(cid:1)shaped notch; lateral lobes triangular, much narrower of thepalm ( Dai, Cai &Yang, 1996: figs. 5(cid:1)4, 5)];
than median lobes. Supraorbital lobes narrow, arched. 3) the merus of the maxilliped is subquadrate, broader
Anterolateral margin with 5 sharp teeth ( including outer than long with the outer(cid:1)distal angle produced, and the
orbital tooth), second tooth largest, fourth smallest, last palp is quitestout[ versus the merus is subtrapezoidal, as
tooth longest, clearly produced beyond other teeth. broad as long, the outer(cid:1)distal angle is notproducedand
Posterolateral margin longer than anterolateral one, the palp is relatively more slender ( Dai, Cai & Yang,
concave, converging posteriorly. Posterior margin 1996: figs. 5(cid:1)3) ]; 4 ) the male abdomen is
slightly convex, forming a bluntangle with posterolateral proportionately broader and shorter, the third to fifth
margin. Antennal basal segment narrower than orbital abdominal segments are completely fused, the length of
breadth, with granulated crest. the third to seventh segments is about 2(cid:2)5 times the
Third maxilliped with ischium about 1(cid:2)5 times as breadth of the sixth segment, the sixth segment is
long as broad. Merus subquadrate, broader than long, trapezoidal in shape, with the lateral margin slightly
with outer(cid:1)distal angle slightly produced; palp relatively arched, and the breadth of the basal border is about 1(cid:2)3
stout. times that of the distal border [versus the male abdomen
Chelipeds unequal, covered with coarsegranules on is relatively more elongate and slender, the third to fifth
dorsal and outer(cid:1)lateral surfaces. Merus with inner abdominal segments are fused but the remnant sutures
margin bearing3 acute spines medially, proximal portion can still be discerned between the segments, thelength of
serrated, distal portion smooth. Carpus armed with 3 the third to seventh segments is about three times the
spines on outer surface, inner(cid:1)distal spine elongate, breadth of the sixth segment, the sixth segment is
slender. Palm armed with 5 spines on dorsal surface, subquadrate, with the lateral margin parallel in most
distal spines much smaller; outer surface with 3 parts, and the breadth of the basal border is about 1(cid:2)5
longitudinal ridges. Finger stout; immovable finger times that ofthedistal border ( Dai, Cai &Yang, 1996:
shorter thanpalm, movablefinger equal tolatter, cutting figs. 5(cid:1)7) ]; and 5) the distal portion of the G1 has two
edges with unequal blunt teeth. Natatory leg with small spines on theinner surface[versus numerous spines
propodus bearing 5 spines; dactylus slender with about ( Dai, Cai &Yang, 1996: figs. 8, 9)] .
(cid:1) 6(cid:1)48(cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) ActaZootaxonomica Sinica 动物分类学报(cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Vol. 33(cid:1) No. 4
Figs(cid:2)9(cid:1)16. Thalamita xishaensis sp. nov. 9. Carapace. 10. Antennalbasal segment. 11. Third maxilliped. 12. Cheliped. 13.
Chela. 14. Last 2 segments of natatory leg. 15. Male abdomen. 16. G1. Scale bars = 1mm, except where indicated
otherwise.
(cid:1) (cid:1) It differs from T. wakensis in the following: 1) the researchgrant (key project 39899400) from the National
medianfrontal lobes normal [versus medianfrontal lobes Natural ScienceFoundation of China andNatural Science
each dividedinto2 small lobes( Edmondson, 1925: fig. Foundation of the Education Department of Jiangsu
7a; Sakai, 1976: figs. 197a; Crosnier, 2002: fig. Province (05KJB180145).
27A(cid:1)C)]; 2) the penultimate antero(cid:1)lateral tooth is
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中国短桨蟹属 (十足目, 短尾次目, 梭子蟹科) 二新种
陈惠莲1(cid:1) 杨思谅2,3
1. 中国科学院海洋研究所(cid:1) 青岛(cid:1) 266071
2. 北京自然博物馆(cid:1) 北京(cid:1) 100050
3. 江苏省滩涂生物资源与环境保护重点建设实验室, 盐城师范学院(cid:1) 盐城(cid:1) 224002
摘(cid:1) 要(cid:1) 记述梭子蟹科 Portunidae, 短桨蟹属 Thalamita 2新 西沙短桨蟹, 新种 T. xishaensis sp. nov. (图 9~ 16)
种, 即刺肢短桨蟹T. acanthophallus 和西沙短桨蟹T. xishaensis。 新种最相似于 T. nanshaensis Dai, Cai &Yang, 1996, and
刺肢短桨蟹, 新种T . acanthophallus sp. nov. (图 1~ 8) T. wakensis Edmondson, 1925。但新种与 T. nanshaensis Dai,
Cai&Yang, 1996, 在头胸甲上的颗粒分布, 螯足、第3颚足、
在整体形态上, 新种最相似于T. danae Stimpson, 1858,
雄性腹部及雄性第 1腹肢的形态等均有明显差异。新种与
T. multispinosa Stephenson & Rees, 1967, and T. holthuisi
Stephenson, 1975。新种与后3种的区别在于: 新种头胸甲只 T. wakensis 的区别主要在于额齿、头胸甲前侧齿的形态, 以
及游泳足前节后缘的齿数。
有4枚前侧缘, 而后3种具 5齿, 而; 雄性腹部第6节明显
词源: 新种种名意指模式标本产地。
短于其它3种; 雄性第1腹肢形态与后3种明显不同。
模式标本采自南中国海西沙群岛, 并保存在中国科学院
词源: 新种种名acanthophallus 来源于希腊文, 意指繁殖器
海洋研究所。
官雄性第1腹肢末部具众多刺。
关键词(cid:1) 梭子蟹科, 短桨蟹属, 新种, 南中国海.
中图分类号(cid:1) Q959(cid:2)223(cid:2)63