Journal of the Marine Biological Association of the UK

Research Article

The phylogenetic relationships between Amphinomidae, Archinomidae and Euphrosinidae (Amphinomida: Aciculata: Polychaeta), inferred from molecular data

Helena Wiklunda1 c1, Arne Nygrena1, Fredrik Pleijela2 and Per Sundberga1

a1 Department of Zoology, Göteborg University, PO Box 463, SE-405 30 Göteborg, Sweden

a2 Department of Marine Ecology, Tjärnö Marine Biological Laboratory, Göteborg University, SE-452 96 Strömstad, Sweden


Amphinomida is an ‘isolated’ clade within the polychaete group Aciculata and traditionally includes the families Amphinomidae, Archinomidae and Euphrosinidae. Archinomidae were erected for a single species, the hydrothermal vent polychaete Archinome rosacea. Originally, A. rosacea was assigned to Euphrosinidae although it shares more morphological similarities with Amphinomidae. In this study we assess the position of Archinome, Euphrosinidae and Amphinomidae by using molecular data from nuclear 18S rDNA and 28S rDNA. Parsimony, maximum likelihood and Bayesian analyses are performed on the nucleotide datasets covering in total 19 terminals from Amphinomidae, Euphrosinidae, Archinomidae and outgroups. Our results conclusively show that Euphrosinidae and Amphinomidae are sister taxa and that Archinome is sister to Chloeia within Amphinomidae. Based on these results the family name Archinomidae is treated as a junior synonym of Amphinomidae.

(Received December 25 2006)

(Accepted November 15 2007)


c1 Correspondence should be addressed to: Helena Wiklund Göteborg University Department of Zoology PO Box 463 SE-405 30 Göteborg, Sweden email: