Heteropsyllus

Novikov, Aleksandr & Sharafutdinova, Dayana, 2021, Two new Canthocamptidae (Copepoda, Harpacticoida) from sponges of the Kara and Laptev Seas, Zootaxa 4948 (3), pp. 336-362 : 348

Key to the females of the genus Heteropsyllus :

1 P1 Exp3 with 5 setae.................................................................................. 2

- P1 Exp3 with 4 setae.................................................................................. 7

2 P2 Enp2 with 6 setae. White Sea, Laptev Sea*................................ H. coulli Kornev & Chertoprud, 2008

- P2 Enp2 with 5 setae.................................................................................. 3

- P2 Enp2 with 4 setae.................................................................................. 5

3 P4 Enp2 with 5 setae, anal operculum with spinules. Kara Sea*............................ H. spongiophilus sp. nov.

- P4 Enp2 with 4 setae, anal operculum naked............................................................... 4

4 P1 Enp3 twice as long as Enp2; syncoxa of maxilliped with 2 setae. North Sea, Mediterranean Sea, Laptev Sea........... ............................................................................ H. exiguus (Sars G.O., 1911)

- P1 Enp3 equal in length to Enp2; syncoxa of maxilliped with 1 seta. Mediterranean Sea....... H. meridionalis Soyer, 1974

5 P3 Enp2 with 5 setae.................................................................................. 6

- P3 Enp2 with 4 setae. North Sea ….................................................... H. masculus Kunz, 1971

6. Endopodal lobe of baseoendopod P5 with 5 setae. Arctic Ocean..................... H. rostratus similis Smirnov, 1946

- Endopodal lobe of baseoendopod P5 with 4 setae. North Sea, Kara Sea, Laptev Sea........ H. rostratus (Sars G.O., 1920)

7 P1 Exp2 with one seta, P4 Enp1 without seta............................................................... 8

- P1 Exp2 without seta, P4 Enp1 with one seta............................................................... 9

8 P1–P3 Enp1 with inner seta. Northwest Atlantic.............................. H. pseudonunni Coull & Palmer, 1980

- P1–P3 Enp1 without inner seta. Northwest Atlantic.......................................... H. nunni Coull, 1975

9 Endopodal lobe of baseoendopod P5 with 5 setae.......................................................... 10

- Endopodal lobe of baseoendopod P5 with 4 setae. Iceland-Faroe ridge.......... H. serratus Schriever, 1983 incertae sedis

10 P2 Enp2 with 5 setae................................................................................. 12

- P2 Enp2 with 3–4 setae............................................................................... 11

11 P3 Enp2 with 4 setae. North Sea, Mediterranean Sea.................................... H. nanus (Sars G.O., 1920)

- P3 Enp2 with 3 setae. Mediterranean Sea.............................................. H. confluens Soyer, 1974

12 Anal operculum dentate**............................................................................. 13

- Anal operculum naked**.............................................................................. 14

13 A2 exopod 2-segmented. Celtic Sea............................................... H. celticus Nam & Lee, 2006

- A2 exopod 1-segmented. Yellow Sea............................................. H. coreanus Nam & Lee, 2006

14 P4 Enp2 with 4 setae. North Sea, Bay of Biscay, Black Sea, Kara Sea, Laptev Sea............ H. major (Sars G.O., 1920)

- P4 Enp2 with 3 setae. North Sea, Celtic Sea........................................ H. curticaudatus Scott T., 1894

* Our data

** This morphological character is not the most successful. The fine serration of the anal operculum can only be seen at very high magnification. Perhaps the authors did not notice this in the original descriptions of H. major and H. curticaudatus .