Zoological Studies

Vol. 57, 2018

(update: 2018.02.05; 02.14)

Description of Elisesione imajimai sp. nov. From Japan (Annelida: Hesionidae) and A Redescription of E. problematica (Wesenberg-Lund, 1950) and Its Confirmation Within Hesionini

Naoto Jimi1,*, Danny Eibye-Jacobsen2, and Sergio I. Salazar-Vallejo3

1Department of Natural History Sciences, Graduate School of Science, Hokkaido University, N10 W8, Sapporo 060-0810, Japan
2Zoological Museum, Natural History Museum of Denmark, Universitetsparken 15, DK-2100 Copenhagen, Denmark. E-mail: dejacobsen@snm.ku.dk
3El Colegio de la Frontera Sur, Depto. Sistemática y Ecología Acuática, Chetumal, México. E-mail: savs551216@hotmail.com

(Received 8 July 2017; Accepted 27 January 2018; Communicated by James D. Reimer)

Naoto Jimi, Danny Eibye-Jacobsen, and Sergio I. Salazar-Vallejo (2018) Elisesione imajimai sp. nov. is newly described based on specimens collected in Sagami Bay, Japan, at a depth of 150-250 m. This new species resembles E. problematica (Wesenberg-Lund, 1950) from Iceland, but differs because in E. imajimai sp. nov. the ventral cirri surpass the tips of the neurochaetal lobes, reaching to the medial part of the neurochaetal bundle; the palps are 1/2-4/5 as long as the antennae; the aciculae are pale brownish; and the dorsal integument shows 9-10 transverse wrinkles per segment, whereas in E. problematica the ventral cirri hardly reach the tips of the neurochaetal lobes; the palps are as long as the antennae; the aciculae are black; and there are 15 transverse wrinkles per segment. A morphological redescription of E. problematica based on its type material and a revised key to identify species in the genus are also provided. A phylogenetic analysis based upon four genes (COI, 16S, 18S, 28S) confirms its position within Hesionini.

Key words: Hesionella, Wesenbergia, Hesionini, Polychaeta, Sagami Bay.

*Correspondence: E-mail: beniimo7010@gmail.com