Thor amboinensis (De Man, 1888)

Xu, Peng & Li, Xin-Zheng, 2015, Report on the Hippolytidae Bate (sensu lato) from China seas, Zoological Systematics 40 (2), pp. 107-165 : 156-157

Thor amboinensis (De Man, 1888) ( Fig. 31 )

Hippolyte amboinensis De Man, 1888: 535 . Type locality: Ambon, Indonesia.

Thor discosomatis Kemp, 1916: 388 , fig. 1, pi. 36: fig. 1.

Thor amboinensis Holthuis, 1947: 50 ; Chace, 1972: 130, figs. 55, 56; 1997: 92.

Material examined. MBM136466 , 1 ovig. ♀ (cl 1.69 mm), Hainan, Nansha Islands, Yongshujiao , 1993-5-17, no. 93-032B, coll. Xin-Zheng Li ; MBM136554 , 3 ♂ (cl 1.55–2.77 mm), 1 ovig. ♀ (cl 3.23 mm), Guangdong, Guangzhou, Shu Island , 1958-5-5, no. 58C-0308, coll. Zhen-Gang Fan.

Description. Rostrum short, more slender in male than in female; falling short of distal end of basal segment of antennular peduncle; dorsal margin with 2–4 teeth; ventral margin generally unarmed. Carapace with antennal tooth, without supraorbital tooth.

Eye subcylindrical, stalk longer than cornea. Pleurae of fourth and fifth abdominal somites each with small posteroventral tooth; sixth somite twice as long as fifth somite. Telson 1.4 times as long as sixth somite; dorsal surface with 4 pairs of dorsolateral spines and 4 pairs of terminal spines.

Antennular peduncle reaching nearly to midpoint of antennal scale; basal segment slightly longer than distal 2 segments combined; second segment with acute distolateral spine; third segment of antennular peduncle with subtriangular dorsal scale; stylocerite reaching or slightly overreaching distal end of second segment, armed with little indistinct tooth near proximal end of lateral margin. Antennal scale 2.5 times as long as wide; lateral margin straight, with distolateral tooth exceeded by lamina.

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

Third maxilliped with exopod; overreaching distal margin of antennal scale by 1/3 of ultimate segment, which with 8–10 corneous spines distally. First pereopod reaching distal margin of antennal scale; dactylus shorter than palm; carpus subequal in length to merus. Second pereopod overreaching distal margin of antennal scale by dactylus and half of propodus; dactylus slightly shorter than palm; carpus subdivided into 6 articles; merus 0.7 times as long as carpus; ischium shorter than merus. Third pereopod in male prehensile, subchelate. Third pereopod in female overreaching distal margin of antennal scale by dactylus and propodus; flexor margin of biunguiculate dactylus with 3–4 spinules; merus with 1 or 2 distolateral spines. Fourth pereopod overreaching distal margin of antennal scale by dactylus and half of propodus; merus generally with only distolateral spine. Fifth pereopod overreaching distal margin of antennal scale by dactylus; outer margin of merus generally unarmed.

Distribution. South China Sea; Africa East, Arabia Sea, Bay of Bengal, Ryukyu Islands, Philippines, Indonesia, Hawaii Islands, Bermuda, Mexico Bay, Caribbean; shallow water, usually with sea anemones or corals.

Figures

Fig. 31. Thor amboinensis (De Man, 1888), carapace, lateral view. Scale bar=1mm.