Chaetopterus, Cuvier, 1830

Sun, Yanan, 2014, A new species of Chaetopterus (Annelida, Chaetopteridae) from Hong Kong, Memoirs of Museum Victoria 71, pp. 303-309 : 308

Key to Pacific species of Chaetopterus

1 Benthic, with most of the tube buried in bottom 7

− Epibenthic, with the tube attached to a solid surface 2

2 Region A with 10–11 chaetigers C. aduncus

− Region A with 9 chaetigers 3

3 Last chaetiger of region A unilobed C. longipes

− Last chaetiger of region A bilobed 4

4 Tube fragile, made of sand and shell debris; notopodia of B1 straight and slender C. izuensis

− Tube parchment-like, made of mud; notopodia of B1 triangular 5

5 A4 modified chaetae light brown; notopodia of region C club-shaped with slightly swollen end C. qiani sp. nov.

− A4 modified chaetae dark brown; notopodia of region C lanceolate with tapered end 6

6 Region A with a prominent bulbous swelling on the dorsal side of notopodia; uncini with 8–9 teeth in B1, 9–10 teeth in B3 C. charlesdarwinii

− Region A without swelling; uncini with 6–7 teeth in B1, 5–6 teeth in B3 C. gregarius

7 Neuropodial dorsal cirri of region C long 8

− Neuropodial dorsal cirri of region C short or rudimentary 9

8 Neuropodial ventral lobe in region C with both dorsal and ventral cirri C. cautus

− Neuropodial ventral lobe in region C with dorsal cirrus only C. pacificus

9 Region A with 13–15 chaetigers C. galapagensis

− Region A with less than 12 chaetigers 10

10 Region C with 5–8 chaetigers C. japonicus

− Region C with more than 10 chaetigers 11

11 Region A with a prominent bulbous swelling on the dorsal side of notopodia C. macropus

− Dorsal swelling in region A absent C. variopedatus