Elaphoidella Chappuis, 1929

Watiroyram, Santi, Sanoamuang, La-Orsri & Brancelj, Anton, 2017, Two new species of Elaphoidella (Copepoda, Harpacticoida) from caves in southern Thailand and a key to the species of Southeast Asia, Zootaxa 4282 (3), pp. 501-525 : 522

Key to species of Elaphoidella Chappuis, 1929 from SEA based on females

1 P5 baseoendopod with 3 setae................................................................... E. trisaetosa

- P5 baseoendopod with 4 setae............................................................................2

2 P5 Exp with 2–3 setae..................................................................................3

- P5 Exp with 4–6 setae................................................................................. 6

3 P5 Exp with 2 setae.......................................................................... E. margaritae

- P5 Exp with 3 setae....................................................................................4

4 P5 with less developed beseoendopod; shorter than half of Exp length................................ E. superpedalis

- P5 with well developed beseoendopod; longer than half of Exp length............................................5

5 Inner margin of caudal ramus with thorn-like seta.................................................... E. cornuta

- Inner margin of caudal ramus with normal seta..................................................... E. javaensis

6 P1 Endp 2-segmented..................................................................................7

- P1 Endp 3-segmented.................................................................................10

7 P5 Exp with 5 setae........................................................................ E. bidens bidens

- P5 Exp with 4 setae....................................................................................8

8 Posterior margin of urosomites smooth........................................................ E. sanoamuangae

- Posterior margin of urosomites serrate.....................................................................9

9 P4 Endp absent........................................................................... E. thailandensis

- P4 Endp present................................................................................ E. elegans

10 Inner seta on P4 Endp-1 absent.......................................................................... 11

- Inner seta on P4 Endp-1 present.........................................................................21

11 P5 Exp with 5 setae...................................................................................12

- P5 Exp with 4 setae...................................................................................13

12 Posterior margin of urosomites smooth.......................................................... E. jaesornensis

- Posterior margin of urosomites serrate....................................................... E. bidens coronata

13 Endopod-2 of P4 with 2–3 setae and spines................................................................14

- Endopod-2 of P4 with 4 setae and/or spines................................................................17

14 Inner seta on P2 Endp-1 present.................................................................... E. labani

- Inner seta on P2 Endp-1 absent..........................................................................15

15 P3 Endp-2 with 4 setae....................................................................... E. vietnamica

- P3 Endp-2 with 5 setae................................................................................16

16 Posterior margin of urosomites smooth............................................................ E. malayica

- Posterior margin of urosomites serrate......................................................... E. sewelli s. str.

17 Posterior margin of urosomites smooth......................................................... E. namnaoensis

- Posterior margin of urosomites serrate....................................................................18

18 Inner seta on P2 Endp-1 absent.......................................................... E. paraaffinis sp. nov.

- Inner seta on P2 Endp-1 present.........................................................................19

19 Inner seta on P3 Endp-1 absent............................................................. E. ligorae sp. nov.

- Inner seta on P3 Endp-1 present.........................................................................20

20 P3 Endp-2 with 3 setae.................................................................... E. bromeliaecola

- P3 Endp-2 with 5 setae...................................................................... E. thienemanni

21 Posterior margin of urosomites smooth....................................................................22

- Posterior margin of urosomites serrate....................................................................25

22 P5 with well developed beseoendopod; about a half of Exp length...................................... E. cuspidata

- P5 with less developed beseoendopod; shorter than half of Exp length...........................................23

23 P5 Exp as long as wide........................................................................ E. bryophila

- P5 Exp more than 1.5 times as long as wide................................................................24

24 P5 Exp about 2.0 times as long as wide.......................................................... E. grandidieri

- P5 Exp more than 2.5 times as long as wide....................................................... E. longipedis

25 P5 Exp with 4 setae.............................................................................. E. affinis

- P5 Exp with 5 setae...................................................................................26

26 Anal operculum with 10–14 spinules........................................................ E. bidens decorata

- Anal operculum with more than 18 spinules................................................................27

27 Caudal ramus about 2.0 times as long as wide..................................................... E. intermedia

- Caudal ramus less than 1.5 times as long as wide...................................................... E. similis