Morphology: All plates with or without papillae, ca.12-15 papillae/μm, are radially veined, with veins dichotomously branching and anasto- mosing increasingly toward the margin, forming a wide inner ring of elongate areolae. Plates with radially-arranged papillae between the slit-like areolae, and two concentric rows of papillae on top of a low marginal rim. Small triangular spine covered by papillae usually present at plate centre. [Konno et al. 2007] Size: Cells 1.9-2.5μm in diameter. Shield plates ca.1.3-1.6μm in diameter. Triradiate girdle plates ca.0.8-1.3μm long (measured along the dorso-ventral plane from end to central structure). Arms of dorsal plate, ca.0.8μm long. Ventral plate ca.1.1-1.8μm in diameter.[Konno et al. 2007]
Ecology & BiogeographyAntarctic and Arctic occurrences [Konno et al. 2007]
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Biology & life-cycles Phylogenetic relations
Geological Range: Last occurrence (top): Extant. Data source: Konno et al. 2007 First occurrence (base): within no known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: Konno et al. 2007
References:
Booth, B. C. & Marchant, H. J. (1987). Parmales, a new order of marine chrysophytes, with descriptions of three new genera and seven new species. Journal of Phycology. 23: 245-260. gs
Konno, S., Ohira, R., Komuro, C., Harada, N. & Jordan, R. W. (2007b). Six new taxa of subarctic Parmales (Chrysophyceae). Journal of Nannoplankton Research. 29(2): 108-128. gsVO
Tetraparma pelagica compiled by Jeremy R. Young viewed: 30-11-2022
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