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- Title
Roscoffia minor sp. nov. (Peridiniales, Dinophyceae): A new, sand-dwelling, armored dinoflagellate from Hokkaido, Japan.
- Authors
Horiguchi, Takeo; Kubo, Fumiyasu
- Abstract
A new, sand-dwelling, armored dinoflagellate, Roscoiffia minor sp. nov., is described from Ishikari beach, Hokkaido, Japan. The dinoflagellate has been collected from sand samples taken both near the water's edge and further upshore (25 m from the water's edge at a depth of 1 m), indicating that it is a true sand-dwelling species. Roscoffia minor is heterotrophic and lacks both a chloroplast and an eye-spot. The cell consists of a flattened cap-shaped epitheca and a large hemispheroidal hypotheca, and it is quite different from cells of the typical armored dinoflagellates. The thecal plate formula is: Po. 3'. la, 5', 3c. 3s, 5''', 1"''. Its distinct cell shape and the thecal plate arrangement indicate affinity to the monotypic genus Roscoffia. Roscoffia minor is distinguished from Roscoffia capitata, the type species. by its smaller size and the possession of a finger-like apical projection. The thecal arrangement of the epitheca is similar to those of the members of the family Podolampaceae, while the hypothecal arrangement is the same as that of members of the subfamily Di-plopsalioideae (family Congruentidiaceae). The or- ganism seems to be positioned somewhere intermediate between these two families, but the family to which this dinoflagellate should be affiliated could not be determined.
- Subjects
HOKKAIDO (Japan); JAPAN; DINOFLAGELLATES; PERIDINIALES; CLASSIFICATION; CHLOROPLASTS; PLASTIDS
- Publication
Phycological Research, 1997, Vol 45, Issue 2, p65
- ISSN
1322-0829
- Publication type
Article
- DOI
10.1111/j.1440-1835.1997.tb00064.x