Heptacarpus acuticarinatus Komai & Ivanov, 2008

Xu, Peng & Li, Xin-Zheng, 2015, Report on the Hippolytidae Bate (sensu lato) from China seas, Zoological Systematics 40 (2), pp. 107-165 : 145-147

Heptacarpus acuticarinatus Komai & Ivanov, 2008 ( Fig. 24 )

Spirontocaris camtchatica Balss, 1914: 44 ; Parisi, 1919: 47; Yokoya, 1933: 26. Not Spirontocaris camtschatica (Stimpson, 1860) .

Heptacarpus camtschaticus: Hayashi & Miyake, 1968: 134 ; Hayashi, 1979: 14; 1992: 180; Liu & Zhong, 1994: 559. Not Heptacarpus camtschaticus (Stimpson, 1860) .

Heptacarpus acuticarinatus Komai & Ivanov, 2008: 9 . Type locality: Sagami Bay .

Material examined. MBM109774 , 4 ♂ (cl 3.36–4.59 mm), 1 ovig. ♀ (cl 4.75 mm), 1958-5-4, 49.2 m, mud, gravel and shell fragment, BT ; MBM109775 , 2 ♂ (cl 3.34–3.87 mm), 3 ♀ (cl 4.96–5.59 mm),1 ovig. ♀ (cl 5.22 mm), Yellow Sea, 1958-4-9, 45 m, mud and shell fragment, BT ; MBM109778 , 7 ♂ (cl 3.98–4.86 mm), 5 ♀ (cl 4.81–5.52 mm), Yellow Sea, 1958-7-6, st. Y1, sand and gravel, AT ; MBM109779 , 1 ♂ (cl 5.32 mm), 1 ovig. ♀ (cl 5.69 mm), Yellow Sea, 1958-7-6, st. Y206, 51.5 m, mud and sand, AT ; MBM109782 , 2 ovig. ♀ (cl 4.19, 4.25 mm), brown sandy mud, BT ; MBM109783 , 2 ♂ (cl 2.93, 3.27 mm), 1♀ (cl 4.20 mm), 1958-4-11, st. Y106, 50.8 m, mud, BT ; MBM109785 , 1♂ (cl 4.47 mm), 1 ♀ (cl 4.61 mm), Yellow Sea, 1958-7-9, st. Y407 ; MBM109786 , 1 ♀ (cl 5.22 mm), Yellow Sea, 1957-7-1, st. Y106, 49 m, mud, BT ,

© Zoological Systematics , 40 (2): 107–165 coll. Rui-Yu Liu; MBM109787 , 1♂ (cl 3.17 mm), 1957-7-12, st. P403, 21 m, sandy mud, BT, coll. Rui-Yu Liu; MBM109788 , 11 ♂ (cl 3.27–4.75 mm), 12 ovig. ♀ (cl 3.49–5.61 mm), 1958-4-9, st. Y207, coll. Zhi-Can Tang ; MBM109789 , 2 ♀ (cl 4.75, 5.21 mm), Yellow Sea , 1957-11-13, st. Y302, 53.3 m, mud, BT, coll. Rui-Yu Liu ; MBM109790 , 1♂ (cl 2.66 mm), 1957-8-2, st. P204, 26 m, sandy mud, BT, coll. Rui-Yu Liu ; MBM109791 , 1♂ (cl 4.02 mm), 1958-5-4, st. YP1, 53 m, sandy mud, gravel and shell fragment, BT ; MBM109792 , 15 ♂ (cl 3.15–4.26 mm), 2 ovig. ♀ (cl 4.17, 5.06 mm), Yellow Sea , 1957-10-25, st. Y1, 51.5 m, sandy mud, roch and shell fragment, BT, coll. Rui-Yu Liu ; MBM109793 , 10 ♂ (cl 3.18–3.93 mm), 1 ♀ (cl 4.86 mm), 4 ovig. ♀ (cl 3.54–5.60 mm), Yellow Sea , 1958-4-11, st. Y107, 50 m, mud and sand, BT ; MBM109794 , 1 ♀ (cl 4.28 mm), Yellow Sea , 1958-7-9, st. Y406, 55.6 m, mud, AT ; MBM109795 , 1 ♂ (cl 4.11 mm), 1 ovig. ♀ (cl 4.79 mm), Southern Yellow Sea , 1975-4-18, 65 m, mud, BT ; MBM109796 , 1 ♀ (cl 5.17 mm), Yellow Sea , 1957-10-2, st. Y205, 51.5 m, sandy mud, BT, coll. Rui-Yu Liu ; MBM109797 , 1 ♀ (cl 4.96 mm), Yellow Sea , 1958-7-7, st. Y302, 57.5 m, mud, AT, coll. Rui-Yu Liu ; MBM109799 , 2 ♂ (cl 3.29, 3.31 mm), 3 ovig. ♀ (cl 4.57–4.93 mm), Yellow Sea , 1957-11-15, st. Y605, 51 m, fine sand, BT, coll. Rui-Yu Liu ; MBM109800 , 1♂ (cl 2.86 mm), Yellow Sea , 1958-6-17, st. Y103, mud, BT ; MBM109801 , 3 ♂ (cl 2.13–2.87 mm), 1 ♀ (cl 3.43 mm), 1957-7-12, st. P401, 52 m, sandy mud, BT, coll. Rui-Yu Liu ; MBM109803 , 23 ♂ (cl 3.61–4.59 mm), 8 ♂ (cl 3.21–4.43 mm), 3 ovig. ♀ (cl 3.86–4.76mm), Yellow Sea , 1957-10-3, st. Y206, 54 m, BT, coll. Rui-Yu Liu ; MBM129685 , 3 ♂ (cl 2.65–3.17 mm), 2 ♀ (cl 4.59, 4.76 mm), 1957-11-14, st. Y506, 35 m ; MBM109820 , 12 ♂ (cl 3.34–4.70 mm), 5 ♀ (cl 4.59–5.22 mm), Yellow Sea , 1959-10-30, 52 m, mud, coll. Hui-Lian Chen.

Description. Rostrum straight, slightly falling short of or reaching distal margin of antennal scale, 1.3 length of carapace; dorsal margin armed with 5–7 teeth including 1 or 2 on carapace, distal 1/5 of dorsal margin unarmed; ventral margin with 5–8 teeth (teeth slightly unequal or subequal in size except for minute distal most tooth); lateral carina sharply defined. Carapace with suborbital lobe rounded, constricted at base, falling short of or reaching antennal tooth; pterygostomial angle always with small tooth.

Abdomen dorsally rounded, not gibbous. Second somite with faint transverse groove on tergite. Pleurae of anterior four somites broadly rounded; fifth pleuron with moderately large posteroventral tooth, posterolateral margin sinuous. Sixth somite 1.5 times longer than fifth and 2.0 times longer than high. Telson 1.2 times as long as sixth somite, about 3.5 times longer than wide, armed with 5 or 6 dorsolateral spines oneither side; posterior margin terminating in acute tooth, with 3 pairs of unequal spines.

Eye-stalk generally subpyriform; cornea slightly wider and longer than remaining part of eyestalk; ocellus distinct, showing as black spot; maximal diameter of cornea 0.2 of carapace length. Antennular peduncle not reaching midlength of antennal scale. First segment unarmed on dorso distal margin; stylocerite overreaching distal margin of first segment, closely in touch with first segment; second segment about 0.3 length of first segment, with small spineat dorsolateral distal angle; third segment short, with small spine on dorsodistal margin. Lateral flagellum with thickened aesthetasc-bearing portion 1/3 length of carapace. Antennal scale slightly longer than carapace and 3.5 times longer than wide; lateral margin straight; distal lamella exceeding beyond distolateral tooth.

Third maxilliped reaching distal 1/4 of antennal scale; ultimate segment with seven darkly pigmented corneous spines

© Zoological Systematics, 40 (2): 107–165 distally. First pereopod reaching nearly to midlength of antennal scale; chela about 1.9 of carpal length; merus about 1.7 of carpal length. Second pereopods reaching distalmargin of antennal scale; dactylus 0.7 of palm length; carpus about 3.8 times longer than chela, divided in 7 unequal articles; ischium subequal in length to merus.

Third to fifth pereopods similar in structure. Third pereopod slightly overreaching distal margin of antennal scale; biunguiculate dactylus about 0.3 of propodal length, armed with 4 or 5 accessory spinules on flexor margin; propodus with 2 rows of slender spinules on flexor margin; carpus about half length of propodus; merus armed with 7–10 lateral spines. Fourth pereopod reaching about distal 0.7 of antennal scale; merus with 5–8 lateral spines. Fifth pereopod reaching midlength of antennal scale; merus with 3–6 lateral spines.

Endopod of first pleopod elongate subtriangular, with conspicuous appendix interna at terminal position; second pleopod with appendix masculina slightly shorter than appendix interna.

Coloration in life. Body and appendages generally pale pink; cornea gray.

Distribution. Yellow Sea; Southern Hokkaido to Kyushu, Japan and Korea, 30– 150 m.

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

Figures

Fig. 24. Heptacarpus acuticarinatus Komai & Ivanov, 2008. A. Carapace, lateral view; B. Abdominal pleurae, lateral view. Scale bars =1mm.