title: Revision of the genus Eusyllis Malmgren, 1867 (Annelida: Phyllodocida: Syllidae: Eusyllinae), with the description of a new species from the eastern Pacific Ocean.
abstract: Eusyllis Malmgren, 1867 (Annelida, Syllidae) is revised, with 7 species considered as valid (Eusyllis assimilis Marenzeller, 1875; Eusyllis blomstrandi Malmgren, 1867; Eusyllis kupfferi Langerhans, 1879; Eusyllis lamelligera Marion & Bobretzky, 1875; Eusyllis longicirrata Imajima, 1966; Eusyllis maxima (Monro, 1930); and Eusyllis nuchalata Hartmann-Schröder, 1965) plus a newly described species (Eusyllis grandmarie n. sp.) the only species of the genus recorded from a whale carcass, lying at more than 600 m deep in the eastern Pacific Ocean off the California coast. The new species is characterized by elongated compound chaetae, with blades almost unidentate, and a thin, spine-like proximal tooth. It differs from Eusyllis longicirrata Imajima, 1966, from Japan, in having shorter dorsal cirri and blades of compound chaetae. Additionally, Eusyllis nuchalata Hartmann-Schröder, 1965 is re-described. A key to the species of the genus is included.
authors.affiliation: Departamento de Biología (Zoología), Facultad de Ciencias, Universidad Autónoma de Madrid, calle Darwin, 2, Cantoblanco, E-28049, Madrid, Spain.; Email: vivian.brusa@gmail.com.
authors.forename: Vivian S
authors.initials: VS
authors.lastname: Brusa
authors.affiliation: Departamento de Biología (Zoología), Facultad de Ciencias, Universidad Autónoma de Madrid, calle Darwin, 2, Cantoblanco, E-28049, Madrid, Spain.; Email: maite.aguado@uam.es.
authors.forename: M Teresa
authors.initials: MT
authors.lastname: Aguado
authors.affiliation: Departamento de Biología (Zoología), Facultad de Ciencias, Universidad Autónoma de Madrid, calle Darwin, 2, Cantoblanco, E-28049, Madrid, Spain.; Email: guillermo.sanmartin@uam.es.
authors.forename: Guillermo
authors.initials: G
authors.lastname: San Martín
authors.affiliation: Scripps Institution of Oceanography, UCSD La Jolla, CA 92093-0202, USA.; Email: grouse@ucsd.edu.
authors.forename: Greg
authors.initials: G
authors.lastname: Rouse
mesh_terms: D063147:Animal Distribution; D000818:Animals; D017753:Ecosystem; D010140:Pacific Ocean; D011077:Polychaeta / Q000033:anatomy & histology* / Q000145:classification* / Q000502:physiology