Spirontocaris pectinifera (Stimpson, 1860)

Xu, Peng & Li, Xin-Zheng, 2015, Report on the Hippolytidae Bate (sensu lato) from China seas, Zoological Systematics 40 (2), pp. 107-165 : 155

Spirontocaris pectinifera (Stimpson, 1860) ( Fig. 30 )

Hippolyte pectinifera Stimpson, 1860: 35 . Type locality: Hokkaido.

Spirontocaris pectinifera Balss, 1914: 42 , figs. 23–24; Kemp, 1914:124 (list); Yokoya, 1930: 528; Holthuis, 1947: 8 (list).

Spirontocaris crassirostris Kubo, 1951: 271 , figs. 11–12.

Material examined. MBM057644 , 2 ♂ (cl 3.26, 3.73 mm), Yellow Sea , 1959-7-16, 48 m, brown mudy sand, Agassiz trawl, coll. Jin-Xiang Jiang ; MBM057647 , 1 ♂ (cl 4.93 mm), Yellow Sea , 1959-10-22, 50.3m, brown mud, sand and shell fragment, AT, coll. Jin-Xiang Jiang ; MBM057648 , 6 ♂ (cl 3.87–6.58 mm), Yellow Sea , 1959-10-17, 71.3 m, fine sand and little stone, AT ; MBM057652 , 1 ♀ (cl 5.18 mm), Yellow Sea , 1959-7-9, 66.5 m, brown mudy sand, AT, coll. Jin-Xiang Jiang ; MBM057653 , 2 ♂ (cl 4.75, 5.12 mm), 4 ovig . ♀ (cl 3.81–5.06 mm), Yellow Sea , 1959-4-18, 59.6 m, brown mud, BT, coll. Jin-Xiang Jiang ; MBM057656 , 4 ♂ (cl 3.55–6.50 mm) , 2 ♀ (cl 2.71, 3.67 mm), Yellow Sea, Jiangsu, Yancheng , 1959-10-18, 66.5 m, brown sandy mud, AT, coll. Gong-Yi Hu .

Description. Rostrum subcircular in lateral view; dorsal margin with 5–30 teeth, of which posterior 2–4 teeth placed on carapace and armed with some secondary teeth; ventral margin with 2–5 teeth; apex bifid or trifid. Carapace dorsally elevated, with usually 3 supraorbital spines; antennal spine and pterygostomial spine well developed; suborbital angle triangularly pointed. Abdomen dorsally smooth; anterior 5 pleurae with 3–9 marginal spines; sixth somite with large spine on lateral surface near posterior margin. Telson with 3–4 pairs of dorsal spines; posterior margin pointed at middle, posterolateral angles also pointed, with 2 pairs of spines.

Eye moderate; cornea with distinct ocellus; eyestalk bearing strong spine, which reaching midpoint of cornea. Antennular peduncle reaching apex of rostrum; basal segment longer than combination of distal two segments; stylocerite slightly overreaching distal margin of basal segment of antennular peduncle; second segment with large distolateral spine; 1 mm.

third segment short, about half as long as second segment, with slender dorsal marginal spine. Antennal scale triangular in dorsal view, about 2.0 times as long as wide, overreaching rostrum by distal 1/3; outer margin ending in lateral spine beyond lamella.

Third maxilliped slightly overreaching distal margin of antennal scale. First pereopod stout, reaching distal end of antennular peduncle. Second pereopod overreaching disal margin antennal scale by chela; carpus subdivided into 7 articles. Third to fifth pereopods similar in structure. Dactylus of these pereopods with 4 or 5 spinules on flexor margin; merus of third pereopod with 2–3 distolateral spines; merus of fourth pereopod with only 1 distolateral spine; merus of fifth pereopod unarmed. Endopod of first pleopod tapering in male and broad in female; endopod of second pleopod in male with appendix interna and appendix masculina of equal length.

Distribution. Yellow Sea; Sea of Japan, Sea of Okhotsk; 30– 80 m.

© Zoological Systematics, 40 (2): 107–165

Figures

Fig. 30. Spirontocaris pectinifera (Stimpson, 1860). A. Carapace, lateral view; B. Abdominal pleurae, lateral view. Scale bars=