Elaphoidella, Chappuis, 1929

Watiroyram, Santi, Janpong, Wongduan & Sanoamuang, Laorsri, 2022, Elaphoidella longiramus sp. nov. (Copepoda: Harpacticoida, Canthocamptidae), a new species of cave-dwelling copepod from central Thailand, Zootaxa 5138 (2), pp. 152-166 : 161-162

Key to the species of Elaphoidella from Thailand caves

[Modified from Sanoamuang & Watiroyram (2021)]

Female:

1. Urosomites with smooth free posterior margins dorsally...................................................... 2

― Urosomites with serrated free posterior margins dorsally...................................................... 3

2. P5 Exp with four setae................................................................... E. sanoamuangae

― P5 Exp with five setae...................................................................... E. jaesornensis

3. P5 Exp with four setae................................................................................. 4

― P5 Exp with five setae................................................................................ 10

4. P4 Enp completely absent or with segmental vestige......................................................... 5

― P4 Enp present....................................................................................... 6

5. P3 Enp-2 with one spine and one seta......................................................... E. thailandensis

― P3 Enp-2 with three setae............................................................. E. longiramus sp. nov.

6. P3 Enp-1 with inner seta............................................................................... 7

― P3 Enp-1 without inner seta............................................................................ 8

7. P3 Enp-2 with three spines and setae......................................................... E. bromeliaecola

― P3 Enp-2 with six spines and setae............................................................ E. namnaoensis

8. P2 Enp-1 with inner seta........................................................................ E. ligorae

― P2 Enp-1 without inner seta............................................................................ 9

9. P4 Enp-2 with three spines and setae............................................................. E. brancelji

― P4 Enp-2 with four spines and setae............................................................. E. paraaffinis

10. Posterior margin of urosomites finely serrated............................................................. 11

― Posterior margin of urosomites coarsely serrated.............................................. E. bidens decorata

11. Caudal ramus without spinules at distal inner margin............................................... E. intermedia

― Caudal ramus with spinules at distal inner margin..................................................... E. isana Male (unknown for E. bidens decorata , E. isana , E. jaesornensis , and E. namnaoensis ):

1. Urosomites with smooth free posterior margins dorsally........................................ E. sanoamuangae

― Urosomites with serrated free posterior margins dorsally...................................................... 2

2. P4 Enp completely absent or with segmental vestige......................................................... 3

― P4 Enp present...................................................................................... .. 4

3. P2 Enp-2 with two setae................................................................... E. thailandensis

― P2 Enp-2 with one seta.............................................................. E. longiramus sp. nov.

4. P2 Enp-1 without inner seta............................................................................ 5

― P2 Enp-1 with inner seta............................................................................... .. 6

5. P2 Enp-2 with three spines and setae............................................................. E. brancelji

― P2 Enp-2 with four spines and setae............................................................ E. paraaffinis

6. P4 Exp-3 with transformed spine........................................................................ 7

― P4 Exp-3 without transformed spine............................................................... E. ligorae

7. Transformed spine of P4 Exp-3 presented with reduced spine........................................ E. intermedia

― Transfromed spine of P4 Exp-3 presented with antler-like spine..................................... E. bromeliacola