Eurycletodes

Bang, Hyun Woo, 2020, A new species of the genus Eurycletodes Sars G. O., 1909 (Copepoda: Harpacticoida: Argestidae) from South Sea of Korea, Journal of Species Research 9 (4), pp. 480-488 : 487

Key to the species of the genus Eurycletodes

1. P1 exp-2 with inner seta, and P5 endopodal lobes with inner element···················································· 2

– P1 exp-2 without inner seta, and P5 endopodal lobes with inner seta ···························································· ··············· subgenus Eurycletodes (Eurycletodes) ······3

– P5 endopodal lobes without inner element ················ ·······························subgenus E. (Oligocletodes)······6

2. Maxillule exopod and endopod each represented by one seta; maxilliped with one seta on syncoxa ·········· ···························································· E. ephippiger *

– Maxillule endopod reduced, and exopod represented by one seta; maxilliped with two setae on syncoxa ··· ····················································· E. paraephippiger *

3. P1 exp-3 with four elements ···································· 4

– P1 exp-3 with five elements ····································· 5

4. Mandibular palp 2-segmented············ E. (E.) serratus

– Mandibular palp 1-segmented······· E. (E.) laticaudata

5. Anal operculum with denticles········ E. (E.) gorbunovi

– Anal operculum with smooth distal margin················ ··················································· E. (E.) rectangulatus

6. P1 endopod 2-segmented ········································· 7

– P1 endopod 1-segmented ······································· 15

7. P1 endopod distal segment with four elements········ 8

– P1 endopod distal segment with three elements ···· 10

8. P4 endopod-2 with four setae ·································· 9

– P4 endopod-2 with five setae ··········· E. (O.) peruanus

9. P5 exopod ovate about twice as long as wide, with five setae··················································· E. (O.) pori

– P5 exopod rectangular and elongated, with three setae················································· E. (O.) profundus

10. P1 exp-3 with five setae, and P4 endopod 2-segmented···································································· 11

– P1 exp-3 with five setae, and P4 endopod 1-segmented················································ E. (O.) arcticus

– P1 exp-3 with four setae, and P4 endopod 2-segmented····················································· E. (O.) latus

11. P2 exp-1 with inner seta, and exp-3 with seven setae; P3 enp-3 with four or five setae ····························· 12

– P2 exp-1 with inner seta, and exp-3 with six setae; P3 enp-3 with three setae ··············· E. (O.) verisimilis

– P2 exp-1 without inner seta, and exp-3 with six setae; P3 enp-3 with 3 setae ·············· E. (O.) irelandica

12.P2-P4 exp-1 with inner seta ·································· 13

– P2-P4 exp-1 with 1, 1, 0 inner seta, respectively ·· 14

– P3-P4 exp-1 without inner seta ································· ·················································· E. (O.) quadrispinosa

13. P2 and P3 enp-2 with five elements··························· ························································· E. (O.) echinatus

– P2 and P3 enp-2 with three and four elements··········· ······················································· E. (O.) parasimilis

14. P2 endopod distal segment with three elements ········ ································································ E. (O.) petiti

– P2 and P3 endopod distal segment with four elements ···················································· E. (O.) similis

– P3 endopod distal segment with five elements ·········· ··························································· E. (O.) monardi

15. P4 endopod 1-segmented ······································· 16

– P4 endopod absent ····························· E. (O.) minutus

16. P1 exp-3 with five elements··································· 17

– P1 exp-3 with four elements ·································· 19

17. P2 exp-3 with seven elements································ 18

– P2 exp-3 with six elements ·············· E. (O.) hoplurus

18. P3 exp-2 without inner seta, and P1-P4 endopod with 4, 4, 2, 2 setae ·························· E. (O.) oblongus

– P3 and P4 exp-2 with inner seta; P1-P4 endopod with 4, 3, 1, 2 setae································ E. (O.) abyssi

– P1-P4 endopod with 3, 2, 4, 2 setae, respectively····· ·················································· E. (O.) uniarticulatus

19.P2-P4 exopod with seven setae; P1 and P2 endopod with three and two setae········································· 20

– P2-P4 exopod with 6, 6, 5 setae, respectively, and P1-P2 endopod with four setae ············ E. (O.) major

20. P5 exopod with four setae, and P1 endopod reaches only to end of exp-1 ··············································· 21

– P5 exopod with five setae······································· 22

21. A2 exopodal seta absent; caudal rami more than 3 times as long as wide································ E. (O.) diva

– A2 with exopodal seta; caudal rami not much longer than their width································ E. (O.) aculeatus

22. A1 last segment with two inner setae; mandibular palp with three setae············ E. (O.) vadumus sp. nov.

– A1 last segment with one inner seta; mandibular palp with four setae ····························· E. (O.) denticulatus

* E. paraephippiger and E. ephippiger , they do not show any apomorphy of either of the 2 subgenera ( Gomez,

2018).