Stygonitocrella, Reid, Hunt & Stanley, 2003

Karanovic, Tomislav & Hancock, Peter, 2009, On the diagnostic characters of the genus Stygonitocrella (Copepoda, Harpacticoida), with descriptions of seven new species from Australian subterranean waters 2324, Zootaxa 2324 (1), pp. 1-85 : 82

Key to genera of Stygonitocrella s. l.

1 Endopod of fourth leg one-segmented ............................................................................................ Stygonitocrella s. l.

- Endopod of fourth leg two- or three-segmented ................................................................................... other Ameiridae

2 Ultimate exopodal segment of first leg with five elements .......................................................................................... 3

- This segment with four elements .................................................................................................................................. 5

3 Endopod of fourth leg reduced to a small, unarmed knob ............................................. Kimberleynitocrella gen. nov.

- This segment well developed, armed............................................................................................................................ 4

4 Third exopodal segment of second and third legs with an inner seta ................................. Gordanitocrella gen. nov.

- This segment without inner seta ........................................................................................ Eduardonitocrella gen. nov.

5 Third exopodal segment of second leg with two outer spines ..................................................................................... 6

- This segment with three outer spines..................................................................................... Lucionitocrella gen. nov.

6 Endopod of fourth leg reduced to a small, unarmed knob ........................................................................................... 7

- This segment well developed, armed with one element ............................................................................................... 8

7 Second exopodal segment of first leg without outer spine ........................................... Psammonitocrella Huys, 2009

- This segment with outer spine ................................................................................... Neonitocrella Lee & Huys, 2002

8 Endopod of second leg with single element ............................................. Stygonitocrella Reid, Hunt & Stanley, 2003

- This segment with two armature elements ................................................................................................................... 9

9 Lateral seta on endopod of second leg present ....................................................................... Reidnitocrella gen. nov.

- This seta absent ........................................................................................................................................................... 9

10 Swimming legs without outer seta on basisInermipes .................................................................... Lee & Huys, 2002

- This seta present........................................................................................................... Megastygonitocrella gen. nov.