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Cocconeis tortilis: a new marine diatom (Bacillariophyta, Cocconeidaceae) from Japan

Hidekazu Suzuki, TAMOTSU NAGUMO, JIRO TANAKA

Abstract


A new species of Cocconeis, C. tortilis, was found on some seaweed collected from the Izu and Okinawa Islands of Japan. Its morphology was examined using both light and electron microscopy; details are described herein. This small diatom is characterized by: 1) a concave raphid valve with a straight raphe inclined from the apical axis, central area forming stauros, and uniseriate striae consisting of circular areolae occluded by hymens: 2) a twisted convex araphid valve with a narrow lanceolate sternum inclined from the apical axis, and uniseriate striae consisting of several loculate areolae occluded by hymens: and 3) a cingulum consisting of three non fimbriated girdle bands including a valvocopula.


Keywords


Bacillariophyta; Cocconeis tortillas; Japan; marine diatom; new species

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DOI: http://dx.doi.org/10.11646/phytotaxa.161.3.5

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ISSN 1179-3155 (print); ISSN 1179-3163 (online)

Published by Magnolia Press, Auckland, New Zealand