Gammarus, Fabricius, 1775

Tong, Yan, Wang, Xiaokun, Liu, Fengsong, Li, Shuqiang & Hou, Zhonge, 2022, Taxonomic study of the genus Gammarus (Amphipoda, Gammaridae) from Xinjiang, China, with description of a new species, Zootaxa 5120 (1), pp. 97-110 : 108-109

Key to Gammarus species from Xinjiang, China

1. Eyes absent......................................................................... Gammarus liuruiyui

- Eyes present......................................................................................... 2

2. Inner ramus of uropod III shorter than one-third of outer ramus............................... Gammarus brevipodus

- Inner ramus of uropod III longer than one-third of outer ramus................................................. 3

3. merus and carpus of pereopods III–IV with long setae........................................................ 4

- merus and carpus of pereopods III–IV with short setae....................................................... 7

4. Uropod III both rami with simple setae.................................................................... 5

- Uropod III both rami with simple and plumose setae......................................................... 6

5. Calceoli of antenna II present............................................................ Gammarus simplex

- Calceoli of antenna II absent............................................................ Gammarus tianshan

6. Inner ramus of uropod III shorter than four-fifth of outer ramus................................. Gammarus decorosus - Inner ramus of uropod III longer than four-fifth of outer ramus.................................. Gammarus lacustris

7. Uropod III outer ramus terminal article longer than one-fifth of first arctile............. Gammarus hoboksar Hou , sp. nov.

- Uropod III outer ramus terminal article shorter than one-fifth of first article....................................... 8

8. Telson with one spine and setae on surface................................................. Gammarus tasitensis

- Telson with two setae on surface......................................................... Gammarus takesensis