摘要
仿五角蟹属Genus Nursilia隶属于玉蟹科Leucosiidae,拳蟹亚科Philyrinae,自Bell1855年建立至今,仅报道过两种:钝齿仿五角蟹Nursilia dentata Bell,1855及修容仿五角蟹Nursilia tonsor Alcock,1896,均分布于印度-西太平洋热带区。Bell对模式种有文字描述及图,而Alcock对其新种的描述过于简单,又无图可参考,这样给后人正确鉴定物种带来了一定困难,因此两个种有时混淆不清。国内过去对本属没有报道,因此,很有必要进行系统的研究。
Nursilia sinica sp.nov.Holotype■.allotype■(K 123B-100),South China Sea(19°30’N,112°30’E.)bottom coarse sand with mud,depth 174 m,1960,Ⅱ.8;Paratype 1■(V466B-21),East China Sea(29°30’N,125°30’E.),bottom fine sand,depth 100 m,1975,X.9;1■(V469B-95),East China Sea(27°30’N,126°E.),bottom fine sand,depth 162 m,1975,X.10.Carapace broader than long,surface with small granules and mushroom-shaped tubercles.Front elevated and bilobed,its median surface depressed,with an oblique posterior ridge on the frontal border.Gastro-hepatic ridge,longitudinal ridge and"M"shaped ridge are marked.There are two obtuse spines one large and one small,on the posterior part of the longitudinal ridge."M"shaped ridge with seven obtuse spines(including last spine of the lateral border and first spine on the longitudinal ridge).Gastric region deeply depressed,with a pair of small spines.There is an obtuse spine behind the oblique gastro-hepatic ridge.Posterior branchial region of the female with an oblique ridge,2-3 coarse granules,which in the male are obscure.There are twelve obtuse teeth of different sizes on the lateral border.The posterior border forms an oblique facet,with a large tubercle at centre,each side with a semicircular tubercle.Ventral surface of third maxilliped covered with mushroom-shaped tubercles and small granules.Ischio-merus segments deeply depressed.The base of merus of female with an oblique ridge and a high longitudinal ridge at the middle of ischium.Inner lateral face of the ridge has a lower thin ridge with dense hairs.On dorsal surface the merus half with a conical tubercle,its extremity joins with the base of carpus.The last three segments slender.The tip of pterygostomian region of carapace is broad,the middle is divided into two blunt teeth by a notch.The merus of chelipeds covered with small granules and mushroomshaped tuber-cles on the borders.The exterior border of carpus with coarser granules.Palm swollen,with the exterior lateral surface slightly depressed,forming cristiform lamina with fine denticles,tip with one or two tubercles on dorsal and ventral surface,the tubercle(s)on the ventral surface being larger.Fingers twice as long as palm,its borders thin,with denticles.The tips of fingers are crossed,inner border with sharp denticles.Pereiopods slender,merus cylindrical.Its surface with small granules,posterior borders with sharp teeth.Carpus longer than propodus,the two segments armed with small granules but anterior border with sharp teeth,posterior border with short setae.Abdomen with the third to sixth terga fused together in both sexes:male abdomen triangular,having a median tubercle near the distal end of the sixth segment;female abdomen oval,with small granules.First male pleopod almost straight,tip equally bifid.This new species may easily be distinguished from the two known species in the gastric region of the carapace being deeply depressed,in having a pair of small spines,in the posterior part of the longitudinal ridge being armed with two obtuse spines,one large and one small,in having cristiform lamina at the outer border of the palm of the chelipeds and in the male first pleopod being equally bifid at the tip.
作者
陈惠莲
Chen Huilian(Institute of Oceanology,Academia Sinica)
出处
《海洋与湖沼》
1982年第3期267-274,共8页
Oceanologia Et Limnologia Sinica
