Anarthruridae

Drumm, David T. & Bird, Graham J., 2016, New deep-sea Paratanaoidea (Crustacea: Peracarida: Tanaidacea) from the northeastern Gulf of Mexico, Zootaxa 4154 (4), pp. 389-414 : 405

Key to genera of Anarthruridae

1. Labrum narrow or elongate-conical (laterally compressed)..................................................... 2

- Labrum conical, not elongate............................................................................4

2. Labrum elongate-conical, reaching end of antenna article-3. Maxillule with five terminal spiniform setae... .. Anarthruropsis

- Labrum narrow, not reaching end of antenna article-3. Maxillule with more than five terminal spiniform setae............ 3

3. Maxilliped endite with one pair distal setae. Uropod exopod with two setae............................ Siphonolabrum

- Maxilliped endite without setae. Uropod exopod with three setae....................................... Anisopechys

4. Labrum distally setose. Maxilliped palp article-3 with six long inner setae............................ .. Acinoproscelos

- Labrum not distally setose. Maxilliped palp article-3 with three or four long inner setae.............................. 5

5. Cheliped propodal palm with lobe or fold..................................................................6

- Cheliped propodal palm without lobe or fold................................................................ 8

6. Cheliped merus with cluster of setae, carpus crenulate, propodal lobe extending onto portions of fixed finger and dactylus. Uropod exopod with two setae............................................................ Crenicarpus n. gen.

- Cheliped merus without cluster of setae, carpus not crenulate, propodal lobe or fold not extending onto portions of fixed finger and dactylus. Uropod exopod with three setae............................................................... 7

7. Pereopods 4–6 with simple spiniform setae....................................................... Anarthrurella

- Pereopods 4–6 with complex spiniform setae..................................................... Synanarthrura

8. Pereopods 4–6 with simple spiniform setae. Cheliped fixed finger with one ventral seta..................... Anarthrura

- Pereopods 4–6 with complex spiniform setae. Cheliped fixed finger with two ventral setae...........................9

9. Maxilliped article-3 with four long inner setae. Pereopods 4–6 with three carpal spiniform setae............... Thorkelius

- Maxilliped article-3 with three long inner setae. Pereopods 4–6 with four carpal spiniform setae...................... 10

10. Maxilliped article-2 with one inner seta............................................................... Keska

- Maxilliped article-2 with three inner setae............................................................. thyomus