Thinora maldivensis Borradaile, 1915

Xu, Peng & Li, Xin-Zheng, 2015, Report on the Hippolytidae Bate (sensu lato) from China seas, Zoological Systematics 40 (2), pp. 107-165 : 122-123

Thinora maldivensis Borradaile, 1915 ( Fig. 8 )

Thor maldivensis Borradaile, 1915: 208 ; 1917: 401, fig. 6; Kemp, 1916: 391; Edmondson, 1925: 6; 252, fig. 153d; Bruce, 1976: 51. Type locality: Male Atoll , Maldive Islands.

Thor spinosus Boone, 1935: 192 .

Thorina maldivensis Bruce, 1997: 14 , figs. 1–6.

Thinora maldivensis Bruce, 1998: 398 .

Material examined. MBM136537 , 1 ♂ (cl 1.73 mm), 3 ♀ (cl 0.76–1.49 mm), 6 ovig. ♀ (cl 1.31–1.87 mm), Nansha Islands , Yongshujiao reef, 1993-5-17, coll. Xin-Zheng Li ; MBM136435 , 1 ♀ (cl 1.15 mm), Xisha Islands , Bei Island, 1958-4-24, coll. Zhen-Gang Fan.

Description. Rostrum short, reaching near to midpoint of basal segment of antennular peduncle; dorsal margin with only 1 tooth and ventral margin unarmed. Carapace smooth, with supraorbital tooth and antennal tooth, without pterygostomian tooth. Pleurae of fourth and fifth abdominal somites each with small posteroventral tooth; sixth somite 1.3 times as long as fifth somite. Telson 1.3 times as long as sixth somite; dorsal surface with 3 pairs of dorsolateral spines and 3 pairs of terminal spines.

Basal segment of antennular peduncle broad, ventromedial margin with stout acute tooth; second segment with acute distolateral spine; third segment of antennular peduncle with subtriangular dorsal scale. Stylocerite reaching distal margin of antennular peduncle, armed with little indistinct tooth near proximal end of lateral margin. Antennal scale 2.5 times as long as wide; distolateral tooth falling short of rounded distal margin of blade.

Eye well developed; large well pigmentedglobular cornea with conspicuous ocellus; stalk stout, compressed. Mandible without palp; incisor process slender, with 6 tiny teeth distally; molar process well-developed.

Third maxilliped in male overreaching antennal scale by ultimate segment; third maxilliped reaching distal margin of antennal scale. First pereopods showing marked sexual dimorphism, greatly hypertrophied insome adult male. First

© Zoological Systematics, 40 (2): 107–165 pereopod in female normal, reaching or slightly overreaching distal margin of antennal scale; dactylus about half length of palm; carpus 0.4 times as long as chela; merus subequal in length to chela, with 1 distolateral acute tooth. Second pereopod overreaching distal margin of antennal scale by chela; carpus subdivided into 6 articles, of which proximal third one longest; merus subequal in length to ischium.

Third pereopod overreaching distal margin of antennal scale by dactylus; flexor margin of biunguiculate dactylus with 2 spinules; flexor margin of propodus with 2 rows of 10–14 spinules; merus armed with 1 distolateral spine. Fourth and fifth pereopods similar tothird pereopod; outer margin of merus generally unarmed. Second pleopod in male completely without appendix masculine.

Distribution. Xisha Islands, Nansha Islands; widely distributed in Indo-West Pacific: Kenya, Tanganyika, Mauritius, Seychelles Islands, Maldives Islands, Laccadive Islands, Solomon Island, Dammam Islands, Ryukyu Islands, Cartire reefs, Great Barrier Reef, Papua New Guinea, Mariana Islands, Marshall Islands, Cook Islands, Kiribati, and Hawaii Islands; 0– 5 m.

Remarks. Not all the adult males with first pereopods have distinct sexual dimorphism, the first pereopods of some adult males are similar to those of females.

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

Figures

Fig. 8 Thinora maldivensis Borradaile, 1915. A. Carapace, lateral view; B. Abdominal pleurae, lateral view; C. Antennular peduncle, dorsal view; D. Telson, dorsal view; E. First pereopod showing marked sexual dimorphism in male, lateral view; F. First pereopod in female, lateral view. Scale bars=1mm.