北太平洋産Poeobius meseres Heathについて

概要

論文の詳細を見る
The present paper is to report the anatomical observations and the phylogenetic accounts of Poeobius meseres Heath, a curious pelagic marine echiuroid. This is the second report of this species after its original description in 1930. The present specimens were collected in the last September by the Ship Baird of the Scripps Trans-Pacific Expedition, from 44°22′ N. 153°00′ E., off the coasts of the Kurile Islands, at a depth of 735m, and were presented me for further study. The body is of elongated ellipse, 8-11.5mm in length, and semitransparent. The anatomical observations of various organs are described in detail, and their resemblances to those of other annelids are discussed. Among the features of these organs, the supra-oesophageal ganglia and the ventral nerve cord, with some pairs of ganglia, are strikingly annelidan in character. Concerning the phylogenetic status I consider that it must be included within the class Echiuroidea but it will be rather apart from the typical members of that class and stand near the Annelida proper.
社団法人日本動物学会の論文
1954-10-15