Heteromastus, Eisig, 1887

Choi, Hyun Ki & Yoon, Seong Myeong, 2016, First record of Heteromastus filiformis (Polychaeta: Capitellidae) from Korean waters, with a taxonomic note on the genus, Journal of Species Research 5 (3), pp. 264-271 : 4

Key to worldwide species of the genus Heteromastus

1. Thoracic hooded hooks with indistinct node on shaft ·· ···················································································· 2

- Thoracic hooded hooks with distinct node on shaft ···· ···················· H. tohbaiensis Yabe and Mawatari, 1998

2. Posterior abdominal segment with conspicuously projecting uncinial spines ···· H. caudatus ( Hartman, 1976)

- Posterior abdominal segment without conspicuously projecting uncinial spines ········································· 3

3. Abdominal segment with palmately arranged filamentous branchiae ······························································ ············· H. filobranchus Berkeley and Berkeley, 1932

- Abdominal segment with simple branchiae ············· 4

4. Branchiae broadly­based and rounded lamellae projecting posteriorly ····· H. filiformis ( Claparède, 1864)

- Branchiae triangular­shaped and carrying abdominal hooded hooks ··························································· 5

5. Abdominal hooded hooks with node situated anterior to middle of shaft ·········· H. hutchingsae Green, 2002

- Abdominal hooded hooks with node located posterior to middle of shaft ··············· H. similis Southern, 1921