A new species of &lt;i&gt;Pista&lt;/i&gt; (Annelida: Polychaeta: Terebellidae) from shallow waters of Shizugawa Bay, Sanriku Coast, Japan

Eijiroh Nishi,Katsuhiko Tanaka

doi:10.3989/scimar.2006.70s3139

Abstract

A new species of the genus Pista (Annelida: Polychaeta: Terebellidae) was found on a boulder bottom in shallow waters of of Shizugawa Bay, Sanriku coast, northern Honshu, Japan. Individuals of this species measure 5 to 10 cm long and 3 to 5 mm wide. There are two pairs of branchiae on segments 2 and 3, each with an annulated long stalk and many dichotomous branches. The peristomium and segment 3 have elongate, semi-circular lateral lobes, segments 2 and 4 each have small lobes, segments 5 and 6 have very small lobes inserted between the neuropodium and ventral pad. Individuals of the new species have 17 pairs of notopodia from segment 4 and conical nephridial papillae on segments 6 and 7. The new Japanese species differs from all known species in the structure of the branchiae and the lateral lobes of anterior chaetigers.

Highlights

We have studied the terebellids from Shizugawa Bay, Sanriku coast, Tohoku region, northern Honshu, Japan (Fig. 1)
We report here on the new taxon of Terebellidae from the shallow water of Shizugawa Bay, Japan
Seven species of Pista have been recorded from Japanese waters: P. atypica Hessle, 1917; P. cristata (Muller, 1776); P. elongata Moore, 1909; P. fasciata sensu Marenzeller, 1885; P. fasciata sensu MacIntosh, 1885; P. microlobata Hessle, 1917; P. robustiseta Caullery, 1915 (Imajima and Hartman, 1964; Uchida, 1992)

Summary

INTRODUCTION

We have studied the terebellids from Shizugawa Bay, Sanriku coast, Tohoku region, northern Honshu, Japan (Fig. 1). Seven species of Pista have been recorded from Japanese waters: P. atypica Hessle, 1917; P. cristata (Muller, 1776); P. elongata Moore, 1909; P. fasciata sensu Marenzeller, 1885; P. fasciata sensu MacIntosh, 1885; P. microlobata Hessle, 1917; P. robustiseta Caullery, 1915 (Imajima and Hartman, 1964; Uchida, 1992). These records and descriptions are brief and provide limited information on the features distinguishing these species. We have expanded their generic diagnosis of Pista (Hutchings and Glasby, 1988) to include species with lateral lobes on segments 2-6 and describe a new species, and compare this with previously described species from Japan and the Pacific

MATERIALS AND METHODS

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