摘要
中国科学院海洋研究所最近在东海水深250米的一个站采到48个海星标本,属于蔷薇海星属Rosaster Perrier,1894的一个新种。描述如下:角海星科GONIASTERIDAE Forbes,1841细腕蔷薇海星(新种)Rosaster attenuatus sp.nov.(图版Ⅰ;图1)鉴别特征R/r为3.1。
Among the sea-stars collected recently by the Institute of Oceanology,Academia Sinica from the East China Sea at a station of 250 meters depth,48 specimens representing a new species of the genus Bosaster Perrier,1894 are described herein.The description is given below.Family GONIASTEEIDAE Forbes,1841 Rosaster attenuatus sp.nov.(Pl.I;Fig.1)Diagnosis E/r 3.1.Form substellate,distal portion of rays rather attenuated;superomarginals rather narrow,not forming a distinct border to the body when viewed from above,and in contact distally for a considerable portion of rays;abactinal plates tabulate and with internal radiating connecting ossicles;adambulacral plates with a straight margin,bearing a regular comb of 9-10 furrow spines,widely spaced from these 12 to 16 prismatic subambulacral grannies,arranged in 2 or 3 series;small entrenched pedicellariae occasionally present;gonads arranged in series.Description The 48 specimens at hand are nearly the same size ranging from E.45-58mm,r.14-18 mm.E=3.0-3.2 r.The average of E/r is 3.1.In the ho-lotype E=53 mm,r=17 mm,E=3.1 r.Disc relatively large and thin,abactinal surface slightly elevated,actinal surface flat.Eays five,gradually tapering from base to a fine pointed tip,distal portion of the rays rather slender,about 1.5 mm in diameter,round in cross-section.Interbra-chial arcs widely round.Abactinal plates low-tabulate,subhexagoiial,arranged in regular series;median radial plates broader than long,larger radial plates with 18-24 truncate peripheral granules and 40-50 subhexagonal,flattened,crowded central granules.Primary basal plates distinct,slightty larger than the other plates.Seen from the coelomic,the hexagonal radial and adradial plates joined by internal elliptical ossicles at the laterals of the plates,and lack the ossicles binding consecutive plates so that there are only 4(laterals)around each plate(fig.1:a).Papulae six about each plate.No abactinal pedicellariae.Superomarginals narrow,much longer than wide as seen from above,and in interhrachial they are more or less vertical,forming an inconspicuous border to the body.From the median interradial line to the extremity,the number of superomar-ginals is 29-32,the average is 31.The fifteenth meets its fellow in the median line of ray,from this meeting point outward the rays become rapidly narrow and attenuated.All plates covered closely with truncate granules similar to those on the abac-tinal surface.A few small,entrenched slender 2-jawed pedicellariae occasionally found in the superomarginals.Inferomarginals correspond to the superomarginals on the interradius and alternated with superomarginals distally.Granulation similar to that of superomarginals.Actinal intermediate plates four-sided,arranged in 5 or 6 regular chevrons,the outer reaching fourth inferomarginal.The plates are plane and covered with polygonal granules,slightly coarser than those of abactinal plates.No pedicellariae.Adambulacral plates longer than wide,with a straight margin,bearing a regular comb of 9-10 four-sided furrow spines,of which the adoral one is shorter.There is a wide,bare area between the furrow spines and the subambulacral spines,which are in 2 or 3 irregular series of 12--16 prismatic granules(Fig.l:b).Mouth plates with a straight marginal series of 9--10 spines like the adambulac-rals except that the inner three become gradually enlarged and more compressed.Su-boral granules 15-20,arranged in 2 or 3 series.Madreporic body small,surrounded by 3 large plates,of which the largest is the primary basal plate.The madreporite is situated about one-third the distance between center and inner edge of superomarginals.Anus subcentral,not prominent,encircled by 6 granules.Remarks This species which I am referring to the genus Rosaster agrees in having internal supplementary ossicle connecting the abactinal plates,and in having the superomarginals in contact medially over a considerable portion of the rays,and in lacking the superambulacral ossicles.
作者
廖玉麟
Liao Yulin(Institute of Oceanology,Academia Sinica,Qingdao)
出处
《海洋与湖沼》
1984年第5期478-481,501,共5页
Oceanologia Et Limnologia Sinica
