Entomolepididae Brady, 1899

Farias, Amilcar, Santana, Alisson, Neves, Elizabeth G. & Johnsson, Rodrigo, 2024, Three new species of Spongiopsyllus Johnsson, 2000 (Copepoda: Siphonostomatoida: Entomolepididae) associated with Aplysina cauliformis (Carter, 1882) (Porifera: Demospongiae) from Todos-os-Santos Bay, Northeastern Brazil, European Journal of Taxonomy 968, pp. 37-59 : 54-55

Key to the species of the family Entomolepididae Brady, 1899 (adapted from Borges et al. (2021)

1. Pedigerous somite 3 and 4 fused ...................................................................................................... 2

– Pedigerous somites 3 and 4 not fused ............................................................................................... 8

2. Most of urosome exposed ................................................................................................................. 3

– Most of urosome hidden under body shield ..................................................................................... 4

3. Antennule 18-segmented with aesthetasc on segment 15, L 4 reduced to a knob .............................. ................................................................................................... Parmulella emarginata Stock, 1992

– Antennule 17-segmented with aesthetasc on segment 16, L 4 biramous with 3-segmented rami ........................................................................ Neoparmulella periperiensis Farias et al., 2020

4. P3 biramous ...................................................................................................................................... 5

– P3 uniramous ( Paralepeopsyllus Ummerkutty, 1960 ) ..................................................................... 6

5. P4 reduced to a knob and antennule 17-segmented ................. Parmulodes verrucosa Wilson, 1944

– P4 absent and antennule 16-segmented .................... Parmulopsyllus iamarinoi Borges et al., 2021

6. Antennule 15-segmented ................................................... Paralepeopsylllus leei Lee & Kim, 2017

– Antennule 14-segmented .................................................................................................................. 7

7. Third exopodal segment of P3 with 3 setae ...... Paralepeopsyllus mannarensis Ummerkutty, 1960

– Third exopodal segment of P3 with 4 spines and 3 setae ................................................................... .............................................................................. Paralepeopsyllus dambayensis Lee & Kim, 2017

8. P4 absent ( Entomolepis Brady, 1899 ) ............................................................................................... 9

– P4 present ........................................................................................................................................ 10

9. Caudal ramus 5–6× as long as wide ............................................... Entomolepis ovalis Brady, 1899

– Caudal ramus at least 10 × as long as wide ........................ Entomolepis hamondi McKinnon, 1988

10. P4 endopod reduced to a small segment ( Lepeopsyllus Thompson & Scott, 1903 ) ........................11

– P4 endopod absent .......................................................................................................................... 12

11. Female antennule 15-segmented .............................. Lepeopsyllus typicus Thompson & Scott, 1903

– Female antennule 13-segmented ................................ Lepeopsyllus ovalis Thompson & Scott, 1903

12. Three postgenital somites in female and four in male ( Spongiopsyllus Johnsson, 2000 ) .............. 13

– Two postgenital somites in female and three in male ( Entomopsyllus McKinnon, 1988 ) ............. 19

13. Female antennule 14-segmented ................................. Spongiopsyllus atypicus Canário et al., 2019

– Female antennule with 15 or more segments ................................................................................. 14

14. Female antennule 15-segmente .................................. Spongiopsyllus redactus Canário et al., 2012

– Female antennule with 16 or more segments ................................................................................. 15

15. Female antennule 16-segmented ..................................................................................................... 16

– Female antennule 17-segmented ................................... Spongiopsyllus adventicius Johnsson, 2000

16. Maxillule inner lobe with 4 setae .................................................................................................... 17

– Maxillule inner lobe with at least 3 setae ....................................................................................... 18

17. Maxilliped endopod formula (2,1,1+claw) ..................................... Spongiopsyllus aramisi sp. nov.

– Maxilliped endopod formula (2,2,0+claw) .................................... Spongiopsyllus porthosi sp. nov.

18. Maxilliped endopod formula (2,1,1+claw), maxillule inner lobe with 3 setae ................................... ............................................................................................................ Spongiopsyllus athosi sp. nov.

– Maxilliped endopod formula (1,1,1+claw), maxillule inner lobe with 2 setae ................................... ................................................................................. Spongiopsyllus intermedius Borges et al. 2021

19. Endopod of P1 shorter than exopod ................................ Entomopsyllus nichollsi McKinnon, 1988

– Endopod of P1 shorter than exopod ................................................................................................ 20

20. Female antennule 15-segmented; third exopodal segment of P4 showing 2 setae ............................. ........................................................................................................ Entomopsyllus stocki Kim, 2004

– Female antennule with more than 16-segments; third exopodal segment of P4 showing 3 or more setae ................................................................................................................................................ 21

21. Female antennule 16-segmented; third exopodal segment of P4 showing 3 setae ............................. .................................................................................................. Entomopsyllus adriae (Eiselt, 1959)

– Female antennule 17-segmented; third exopodal segment of P4 showing 4 setae ............................. ............................................................................... Entomopsyllus brevicaudatus Lee & Kim, 2017