A new species of the genus Ensiculifera (Dinophyceae); its cyst and motile forms

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概要

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• A new calcareous cyst form attributable to Ensiculifera, which is one of the small orthoperidinioid dinoflagellates, is found in surface sediments of central Japan. Other occurrences of the thecate cells are recorded from the Caribbean Sea. The cysts are spherical, 43-54 μm in diameter and comprise a calcareous outer layer forming a muri and/or large verrucate structure and a smooth inner layer. The paracingulum and parasulcus can be reflected by parallel rows of calcareous muri, but other paraplate features are indistinct. The archeopyle is a therophylic intercalary type, and the archeopyle suture probably runs between the apical and anterior intercalary plate series. Thecate cells are 18.3-54.2 μm in length by 16.2-38.2 μm in width, and are generally dark brown in color. The epitheca, with a conspicuous apical horn, is triangular in dorso-ventral view and the hypothec a is laterally asymmetrical with a single small and hollow projection (carina) at the triple junction of plates Sp, 1"" and 2"". The Ct plate (cingular transitional plate) has a long spine at its anterior right corner. The plate formula is Po, X, 4', 3a, 7", 5c (4c+t), 5s, 5"', and 2"". Based on these morphological features, this species differs from species of such other genera of small orthoperidinioid dinoflagellates as Scrippsiella, Peridinium and' Pen tap ha rsodinium. Therefore, we describe it to be a new species of the genus Ensiculifera; Ensiculifera carinata MATSUOKA, KOBAYASHI et GAINS sp. nov.

• Plankton Society of Japan,日本プランクトン学会の論文

著者

• 小林 聡

  (株)東京久栄技術センター

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