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Investigaciones marinas

On-line version ISSN 0717-7178

Abstract

ROZBACZYLO, Nicolás; MORENO, Rodrigo A.  and  DIAZ-DIAZ, Oscar. Benthic subtidal polychaetes on soft bottoms in Aysén, Chile: Clades Amphinomida, Eunicida, Spionida, Sabellida and Scolecida (Annelida, Polychaeta). Investig. mar. [online]. 2006, vol.34, n.1, pp.43-62. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71782006000100004.

We present results from a taxonomic study of subtidal benthic polychaetes belonging to the Amphinomida, Eunicida, Spionida, Sabellida and Scolecida clades, obtained during the Cimar-7 and Cimar-8 Fjords research cruises. We include morphological observations and illustrations, synonymy and the geographical distribution for each species. Samples were obtained in the Aysén region (43º45’S-46º28’S), on the southeastern Pacific coast of Chile, from silt-clay bottoms using an Agassiz trawl between 20 and 444 m depth. During the two cruises we collected 79 specimens from the Eunicida clade (corresponding to six species, grouped into six genera and five families); two specimens of the species Pareurythoe chilensis (Kinberg) and Chaetopterus cf. variopedatus (Renier) from the Amphinomida and Spionida clades, respectively; 13 specimens from the Sabellida clade (four species, grouped into four genera and three families); and 187 specimens from the Scolecida clade (three species grouped into two genera and one family). We collected a total of three species of Maldanidae (20% of the total sampled abundance), two species of Lumbrineridae and Serpulidae (13.3%), and one species each of Amphinomidae, Dorvilleidae, Eunicidae, Oenidae, Onuphidae, Chaetopteridae, Sabellariidae and Sabellidae (6.7%), respectively. During the Cimar-7 cruise we collected a total of 178 polychaete specimens, noteably Maldane sarsi antarctica Arwidsson which represented 73% of total abundance. During the Cimar-8 cruise we collected 105 polychaetes; Maldane chilensis Hartmann-Schröder represented 50.5% of total sampled species abundance. Our findings increase the total number of benthic polychaete species currently recorded for the Aysén region to 91 species

Keywords : Polychaeta; cold temperate waters; Province; southeastern Pacific.

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