Nannotax3 - ntax_non_cocco - Prymnesium parvum forma patelliferum

Prymnesium parvum forma patelliferum

Classification: ntax_non_cocco -> hidden -> deleted -> Prymnesium parvum forma patelliferum
Sister taxa: Micrascidites, M. sp., M. vulgaris, Pentalaminaceae, P. parvum forma parvum, P. parvum forma patelliferum, S. ramonii, ThoracosphaeraceaeDEL, Triparmaceae, taxon list.txt, Common calc dinos


Citation: Prymnesium parvum forma patelliferum (Green et al. 1982) Larsen 1999
Rank: form
Basionym: Prymnesium patellifera Green, Hibberd & Pienaar 1982

Catalog entries: Prymnesium patellifera

Original description: Swimming cells 6-12 µm long x 3.5-8-0 µm broad; mostly sub-spherical to elongate with more or less parallel sides and rounded posterior end; sometimes bent or pyriform or with a tapered posterior end; anterior end obliquely truncate. Two equal or sub-equal distally tapered heterodynamic flagella, 10-14.5 µm in length and a short, 3.0-5.0 µm, flexible non- coiling haptonema arising sub-apically from a groove or depression in the truncate face. Swimming motion smooth, the cell rotating about its longitudinal axis and the anterior (flagellar) pole describing a helix about the path of travel; flagella directed posteriorly.

Body scales 0.36-0.37 µm x 0.25-0.27 µm, of two types in two layers: scales of the inner layer with a narrow inflexed rim, a central thickening on the distal face, and a radial fibrillar pattern on both faces; scales of the outer layer similar but with relatively tall upright rims.

Chloroplasts two, lateral and parietal, yellow-green to olive, lobed or dissected, each with an immersed pyrenoid. Nucleus central between the chloroplasts, Golgi body parabasal. Reserve metabolite probably chrysolaminarin (leucosin) accumulated in a posterior vacuole. Peripheral muciferous bodies and usually several lipoidol globules present.

Cysts ovoid, 9.3-10.8 µm x 6.0-6.4 µm, with a simple sub-anterior pore, the latter 2.75- 3.00 µm in diameter; wall composed of layers of scales with electron-dense siliceous material deposited on the distal surfaces of the outermost scales.



Geological Range:
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source:


Green, J. C., Hibberd, D. J. & Pienaar, R. N. (1982). The taxonomy of Prymnesium (Prymnesiophyceae) including a description of a new cosmopolitan species, P. patellifera sp. nov., and further observations on P. parvum N. Carter. British Phycological Journal. 17: 363-382. gs V O

Missing or ambiguous references: Larsen 1999;


Prymnesium parvum forma patelliferum compiled by Jeremy R. Young viewed: 6-7-2022

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