Platorchestia japonica Tattersall, 1922

Hou, Zhong-E & Li, Shuqiang, 2005, Amphipod crustaceans (Gammaridea) from Beijing, P. R. China, Journal of Natural History 39 (36), pp. 3255-3274 : 3260-3261

Platorchestia japonica Tattersall, 1922

Talorchestia japonica Tattersall 1922, p 452 .

Platorchestia japonica: Bousfield 1982, p 27 .

Platorchestia japonica: Morino and Dai 1990, p 7 ; Hou and Li 2003c, p 2441 –2460.

Material examined

Fengsui Relic , Xiabanquan Village, Yanqing County, collected by Shuqiang Li and Zhong-E Hou: one female, 26 August 2001; eight males, 7 April 2004; four males, 7 April 2004; 57 males, 7 April 2004; nine males and nine females, 18 May 2004; three males and five females, 18 May 2004; 34 males, 40 females and one juvenile, 18 May 2004; three males and four females, 18 May 2004; seven males and five females, 18 May 2004; seven males and five females, 18 May 2004; 22 males and 33 females, 18 May 2004. Guanting Reservoir, Heilongmiao Village , Yanqing County, collected by Shuqiang Li and Zhong-E Hou: two males and six females, 18 May 2004; 14 males and 14 females, 18 May 2004; three males and five females, 18 May 2004. Yuanmingyuan Park: 40 males and 65 females, 25 May 2004, collected by Zhong-E Hou and Yucheng Lin. Paddyfield near Jingmiyingshuiqu River , Xibeiwang Village : 65 males and 24 females, 22 August 2000, collected by Shuqiang Li and Zhong-E Hou. River at the foot of Mt Yuquanshan: five males and five females, 22 May 2001, collected by Shuqiang Li and Zhong-E Hou. Huamu Spring , Huamu Village, Huairou District: four females, 2 June 2001, collected by Shuqiang Li.

Diagnosis

Left mandibular lacinia mobilis five-dentate; male gnathopod 1 with swollen carpus and propodus; gnathopod 2 powerfully subchelate; female gnathopod 2 with anteriorly broadened basis and posteriorly tumescent carpus and propodus; carpus of pereopod 4 short; outer ramus of uropod 1 marginally unarmed.

Remarks

Platorchestia japonica was firstly recorded as Talorchestia japonica from Lake Biwa by Tattersall (1922). Bousfield (1982) ascribed it to the genus Platorchestia . Morino and Dai (1990) redescribed P. japonica from specimens collected along the Changjiang River, China, after which this species was reported based on specimens collected from Beijing ( Hou et al. 2002). The present material well accords with the figures and description of P. japonica given by Hou et al. (2002), except the variable size of the eyes and variable spines and setae on the appendages.