Hemilepistus (Hemilepistus), 1930

Wang, Jin, Hong, Xinkai & Li, Weichun, 2022, First record of the genus Hemilepistus (Isopoda: Agnaridae) from China, with description of two new species, Zootaxa 5188 (1), pp. 87-94 : 93

Key to the species of the subgenus Hemilepistus (Hemilepistus)

1. Posterior margin of pereonite 3 smooth................................................................... 2

- Posterior margin of pereonite 3 with tubercles.............................................................. 5

2. Lateral tuberosity present on pereonite 3.................................................................. 3

- Lateral tuberosity absent on pereonite 3................................................................... 4

3. Pereonites 1 and 2 with bulbous tubercles directed upwards............................... H. (H.) dushengi sp. nov.

- Pereonites 1 and 2 with long conical tubercles directed upwards on tergite 1 and backwards on tergite 2................................................................................................. H. (H.) conicus sp. nov.

4. Head with two curved rows of small tubercles..................................... H. (H.) reductus Borutzky, 1945

- Head with single large tubercle in median position................................ H. (H.) rhinoceros Borutzky, 1958

5. Pereonites 1 and 2 with well-developed tubercles and formed tall upright crests................................... 6

- Pereonites 1 and 2 with small tubercles near posterior and lateral margins........................................ 9

6. Flagellum of antenna with segment 2 as long as segment 1.................................................... 7

- Flagellum of antenna with segment 2 half as long as segment 1................................................. 8

7. Pereonites 3 with small bulbous tubercles, tergite 4 with small lateral tubercles only...... H. (H.) crenulatus (Pallas, 1771)

- Pereonites tergite 3 with long tubercles, tergite 4 with weak posterior tuberosities and well-developed lateral tubercles............................................................................ H. (H.) cristatus Budde-Lund, 1885

8. Frons with six tubercles forming semicircle surrounding two median tubercles.......... H. (H.) aphganicus Borutzky, 1958

- Frons without median tubercles.................................................. H. (H.) magnus Borutzky, 1945

9. Pereonite 4 with well-developed tubercles................................................................ 10

- Pereonite 4 with faint traces of tuberosity................................................................. 11

10. Head with 12–14 large tubercles................................................. H. (H.) schirasi Lincoln, 1970

- Head with 25–30 small tubercles....................................... H. (H.) reaumurii (Milne-Edwards, 1840)

11. Pereonites 2 and 3 with conical tubercles directed backwards............................ H. (H.) klugii (Brandt, 1833)

- Pereonites 2 and 3 with bulbous tubercles directed upwards..... H. (H.) taftanicus Kashani, Sari & Hosseini Ostavani, 2010