Heptacarpus rectirostris (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 : 153-154

Heptacarpus rectirostris (Stimpson, 1860) ( Fig. 29 )

Hippolyte rectirostris Stimpson, 1860: 102 ; Doflein, 1902: 637. Type locality: Hakodate.

Spirontocaris rectirostris Rathbun, 1902: 44 ; Balss, 1914: 43; Yokoya, 1930: 531.

Heptacarpus rectirostris Holthuis, 1947: 13 ; Miyake & Hayashi, 1968: 434.

Material examined. MBM129654 , 1 ♀ (cl 6.67 mm), Shandong, Qingdao, Shazikou , 1957-1-20 , coll. Yong-Liang Wang, Feng-Xuan Zhang & Zhen-Gang Fan; MBM129655 , 1 ovig. ♀ (cl 5.34 mm), 1964-4-17 , 29 m, mud, AT, coll. Feng-Shan Xu; MBM129670 , 12 ovig. ♀ (cl 4.87–5.71 mm), Hebei, Beidaihe ; MBM129674 , 1 ovig. ♀ (cl 5.13 mm), 1958-4-2 , st. P803, 19.3 m, mud, BT; MBM129678 , 1 ovig. ♀ (cl 7.46 mm), 1961-1-1 , donated by Yellow Sea Fisheries Research Institute; MBM129679 , 4 ♀ (cl 4.06–4.43 mm), 1958-4-7 , st. P4, coll. Wei-Quan Zhang; MBM129680 , 3 ovig. ♀ (cl 5.39–6.55 mm), 1958-4-7 , 10 m, mud, BT; MBM129682 , 1 ovig. ♀ (cl 6.41 mm), st. Y108, 1958-3-24 , 49.3m, BT; MBM129684 , 2 ♀ (cl 3.66, 3.98 mm), Yellow Sea , 1957-11-16 , st. Y803, 56.5 m, BT, coll. Rui-Yu Liu; MBM129686 , 2 ♂ (cl 3.16, 3.35 mm), 2 ♀ (cl 3.72, 4.59 mm), 1957-10-28 , st. Y108, 50 m, BT, coll. Rui-Yu Liu; MBM129687 , 1 ♀ (cl 3.37 mm), 1958-3-23 , st. Y501, 19.5 m, mud, BT; MBM129688 , 1 ♀ (cl 5.10 mm), 1958-4-7 , st. P303, 32.7 m, mud and sand; MBM129689 , 1 ♀ (cl 4.04 mm), 1 ovig. ♀ (cl 5.34 mm), 1958-4-2 , st. P902, 16 m, mud; MBM129708 , 5 ovig. ♀ (cl 4.22–6.01 mm), Shandong, Rongcheng, Longxu Island , 1951-5-6 ; MBM129709 , 3 ♂ (cl 2.17–2.68 mm), Liaoning, Changhai, Haiyang Island , 1956-9-27 ; MBM129712 , 11 ♂ (cl 3.45–4.31 mm), 5 ovig. ♀ (cl 4.21–4.79 mm), Shandong, Yantai, Fish Market , 1951-4-12 ; MBM129723 , 3 ovig. ♀ (cl 5.01–5.47 mm), Shandong, Yantai, Qing Moutain , 1954-3-2 ; MBM129730 , 16 ♂ (cl 2.02–3.79 mm), 37 ovig. ♀ (cl 3.86–5.25 mm), Shandong, Yantai , 1955-4-1 , coll. En-Ze Yang.

Description. Rostrum narrow and straight, slightly overreaching distal margin of antennular peduncle; dorsal margin armed with 5 or 6 teeth, of which first 2 or 3 placed on carapace behind orbit; ventral margin with 2, 3 or 4 teeth near apex. Antennalspine developed and acute, separated from round suborbitalangle by notch. Pterygostomian spine small but distinct. Abdomen smooth, not forming ridges or grooves.

Pleurae of fourth and fifth somites pointed posteriorly. Telson shorter than uropod, tapering and armed with usually 4 pairs of dorsal spines or asymmetrically with 3 spines on one side; posterior margin of telson ending in an acute triangular point and armed with one long plumose hair and two, long inner and short outer, spines on either side of acute point.

Eye moderate in size and cylindrical; cornea slightly shorter than stalk and ocular spot distinct in contact with cornea. Antennal peduncle reaching middle of antennal scale; first and second segment each with marginal spine on lateral side; third segment with similar spine at top of dorsal side. Stylocerite pointed anteriorly, just reaching or falling short of distal margin of second segment. Outer antennular flagellum thickened and setose in proximal 10–15 segments. Antennal scale long, being about 2.8 times as long as wide and narrowed distally; outer margin straight and ending in spine. Mandibular palp two-segmented; terminal segment being longand setose; distal apex of incisor process with 4 tiny teeth; molar process bearing tooth and many spinules. Molar nrocess bears tooth and many spinules.

Third maxilliped slender, reaching with distal halfor distal third of ultimate segment beyond distal margin of antennal scale; provided with epipod but destitute of exopod; ultimate segment much shorter than carapace and armed with 7 corneous spines at apex. First pereopod rather stout, reaching distal margin of antennal scale; merus slender and cylindrical, being 3.5–4.0 times as long as wide,with diagnostic spine on subterminal portion of outer margin; chela less than twice as long as carpus. Second pereopod slender, reaching beyond distal margin of antennal scale by half of carpus which subdivided into 7 articles; ischium somewhat compressed, being longer than merus; carpus much longer than chela; movable finger shorter than palm. First three pereopods each with epipod. Third pereopod reaching beyond tip of antennal scale by dactylus which bearing 4–5 spines excluding terminal claw; merus armed with series of 4–6 spines along outer margin. Fourth pereopod falling short of apex of antennal scale; merus armed with 3–5 outer spines, situated along distal

© Zoological Systematics, 40 (2): 107–165 two-thirds of outer side. Fifth pereopod reaching tip of antennular peduncle; merus armed with 3–5 spines on distal half.

Endopod of first pleopod in male tapering in distal third, with some retinacula near apex. Endopod of second pleopod in male provided with long slender appendix interna and very short appendix masculina.

Coloration in life. Variable, usually bule-green; eggs orange.

Distribution. Bohai Gulf, Yellow Sea, East China Sea; northern waters of Japan; 5– 60 m.

Figures

Fig. 29. Heptacarpus rectirostris (Stimpson, 1860). A. Carapace, lateral view; B. Abdominal pleurae, lateral view; C. Antennule, dorsal view; D. Antennal scale, dorsal view; E. First pereopod, lateral view; F. Second pereopod, lateral view; G. Third pereopod, lateral view. Scale bars=1mm.