Polydora

Surugiu, Victor, 2012, Systematics and ecology of species of the Polydora - complex (Polychaeta: Spionidae) of the Black Sea, Zootaxa 3518, pp. 45-65 : 56

Key to the genera and species of the Polydora -complex from the Black Sea

1 Chaetiger 5 slightly modified, with well-developed parapodia; major spines of chaetiger 5 of two types, arranged in curved Ushaped, double row; outer spines spoon-shaped, with bristles within concavity and tapering point, inner spines longer, with an angled distal end and rounded point; hooded neuropodial hooks from chaetiger 8; hooded hooks with main fang at acute angle to shaft with secondary tooth closely applied to main fang............................... Pseudopolydora antennata *

– Chaetiger 5 greatly modified; major spines of chaetiger 5 of one type, arranged in straight line or in slightly curved row; hooded neuropodial hooks from chaetiger 7; hooded hooks with prominent acute angle between teeth.................. 2

2 Chaetiger 1 without notochaetae; hooded hooks with constriction and manubrium on shaft, with main fang at more or less right angle to shaft; hooks not accompanied by inferior capillaries..................................... Genus Polydora 3

– Chaetiger 1 with notochaetae; hooded hooks with smooth, curved shafts, without constriction or manubrium, with main fang directed more or less apically, forming wide angle with shaft; hooks accompanied by inferior capillaries in anterior neuropodia.................................................................................... Genus Dipolydora 4

3 Prostomium with occipital antenna; modified spines of chaetiger 5 with small distinct lateral tooth and with thin subdistal longitudinal flange; companion chaetae distally bifurcate and plumose; builds tubes on various types of substrata.................................................................................................. Polydora cornuta

– Prostomium without occipital antenna; modified spines of chaetiger 5 with lateral flange; companion chaetae lanceolate; bores in calcareous structures.................................................................. Polydora websteri

4 Eyes arranged in transverse row; major spines of chaetiger 5 bifid, with bushy tuft of fine bristles between teeth; companion chaetae absent..................................................................... Dipolydora quadrilobata

– Eyes arranged in square; major spines of chaetiger 5 falcate, with large, flattened, beaklike curved end bearing large distinctive crest of bristles; companion chaetae present, reduced to thin, simple capillaries................... Dipolydora caulleryi *