摘要
中国科学院海洋研究所于1960年在中国南部采集的蛇尾类中,有7个标本是盘棘蛇尾属Ophiocentrus Ljungman,1867的一新种。现描述如下。系统描述 阳遂足科Family AMPHIURIDAE Ljungman,1867异常盘棘蛇尾(新种)Ophiocentrus anomalus sp.nov.(图1;图版Ⅰ)IOAS-E00965。
Among the ophiurans collected by the Institute of Oceanology,Academia Sinica are seven specimens of a new species of the genus Ophiocentrus Ljungman,1867.The following is a description for this new species:Family AMPHIURIDAE Ljungman,1867 Ophiocentrus anomalus sp.nov.(Fig.1;P1.Ⅰ)Holotype IOAS-E00961,Gulf of Beibu.18°30′N,108°15′E,depth 62 meters,sand mud bottom.may 26,1960.Paratypes IOAS-E00965,Gulf of Beibu,Xiamen coast,depth 19—62 meters;6 specimens.Description Size large,diameter of disk sometimes over 20mm,arms about eight times as long as disk diameter,width of arms at base about 3.5mm(at d.d.20mm).Disk more or less puffed,covered by a thick skin,in which are hidden some fine,thin scales,each of the more conspicuous ones with a small,elongated spinelet,the covering of which,as a wholc,is sparse.When dried,the scales around the radial shields become visible,the skin turns dark and appears to lack calcification,and the interradial spaces of disk become concave.Large part of dorsal surface of disk is occupied by radial shields,which are very large,about 4 mm long and 1 mm wide(at d.d.15 mm),meeting distally or separated throughout.Interbrachial space below covered by skin,in which fine scales are embedded.Some of these scales carry a small,slender spinelet identical with those on the dorsal surface;these spinelets are more crowded toward the periphery of disk.Genital slits rather broad,provided on their internal border with a row of rather broad scales.Oral shields small,slightly raised,longer than broad,with an obtuse proximal angle and a small distal lobe.Adoral plates small,somewhat crescentiform and not meeting in the median interrarial line.A quite unique feature is that the adoral plates appear to lack distal oral papilla or at most vestigial.Of seven specimens examined,only two with a single small distal oral papilla in one side of a radii,attached to the proximal end of an adoral plate;five others with no distal oral at all.Paired infradepental papillae on apex of jaw distinct.Two oral tentacle scales in each slit,large,conical and pointed,situated in a higher level.Dorsal arm plates small,occupy only a very limited portion of the dorsal surface of arms,the greater part of which is covered by the side arm plates.Except for the first one or two,they are somewhat heart-shaped,a little longer than broad,or as long as broad,with a blunt distal angle,and somewhat straight sides,proximal edge concave in the middle,more or less overlapping,or slightly separated from each other by a skin.First ventral arm plates small,wider than long;succeeding Plates rectangular longer than wide,with rounded corners,outer surface raised and forms a small knob;after fourth or fifth,these plates become pentagonal or tetragonal,wider than long,with concave distal,margin,slightly separated from each other by a skin.Side arm plates developed,not meeting either below or above,each plate carries ten blunt-pointed arm spines,of which the lowest is the,largest and stouter,.its length exceeds a joint.Surface of all arm spines is smooth,except the second from below of which the tip is occasionally slightly incurved,but not forming a hook.Tentacle pores extremely large,and without scales.Colour of specimens in alcohol grayish white.Remarks This species is distinguished at a glance from the other species of the genus Ophiocentrus by its absence of distal oral papilla.So far as I know,no species of Ophiocentrus are known to lack the distal oral papilla.It seems to be very well characterized and quite distinct from any of its relatives.
作者
廖玉麟
Liao Yulin(Institute of Oceanology,Academia Sinica)
出处
《海洋与湖沼》
1983年第4期407-410,412,共5页
Oceanologia Et Limnologia Sinica
