Identification key to described species of Amphitritides

(Type locality in brackets)

1A. Double rows of uncini only on thoracic neuropodia.......................................................... 2

1B. Double rows of uncini on some anterior or most abdominal neuropodia.......................................... 3

2A. 13 pairs of notopodia (Chile)....................................... A. pectinobranchiata Hartmann-Schröder, 1965

2B. Usually 21 pairs of notopodia (Namibia)................................................. A. namibiensis sp. nov.

3A. Double rows of uncini only on some anterior abdominal neuropodia (Namibia)................. A. skeletonensis sp. nov.

3B. Double rows of uncini on most abdominal neuropodia........................................................ 4

4A. Notopodia extending until posterior body (Australia, Queensland)................... A. harpa Hutchings & Glasby, 1988

4B. Notopodia only on thoracic segments..................................................................... 5

5A. 27 pairs of notopodia; 15 pairs of genital papillae on segments 6–20 (USA, Florida)....... A. bruneocomata (Ehlers, 1887)

5B. Number of notopodia and genital papillae in other combination................................................. 6

6A. Very short branchial filaments with rugose tips; 22–26 pairs of notopodia; 11–13 pairs of genital papillae from segment 6 (Greece)........................................................ A. kuehlmanni Arvanitidis & Koukouras, 1995

6B. Branchial filaments long, tips filamentous; number of notopodia and genital papillae in other combination............... 7

7A. Genital papillae between parapodial lobes; 17– 21 pairs of notopodia; 8 pairs of genital papillae on segments 6–13 (Great Britain).......................................................................... A. gracilis (Grube, 1860)

7B. Genital papillae at anterior base of notopodia and aligned to them............................................... 8

8A. 22–23 pairs of notopodia; 10 pairs of genital papillae on segments 6–15 (Namibia).................... A. jirkovi sp. nov.

8B. Number of notopodia and genital papillae in other combination................................................. 9

9A. Small species with 18–20 pairs of notopodia and 9 pairs of genital papillae (Australia, Queensland)............................................................................................. A. ithya Hutchings & Glasby, 1988

9B Median-sized species with 19–22 pairs of notopodia and 14 pairs of genital papillae (Australia, NS Wales)................................................................................... A. carawa Nogueira & Hutchings, 2007