Prymnesium chiton

Taxonomy:

Catalog entries: Chrysochromulina chiton

Original description: Motile cells showing some metaboly, sphaeroidal to ovoid with a flattened flagellar pole depressed centrally across one axis, 5-8 (exceptionally 4-10) µm in diameter. Two flagella and one haptonema arising close together slightly off-centre from the depression; the flagella subequal, or of equal length, homodynamic, 2½-3½ times body length, smooth, apex gradually attenuated to a small knob (E. M. observation); the haptonema, thinner than the flagella, 4-5 times body length when fully extended, with a club-shaped tip and an internal structure of three concentric membranes surrounding a ring of seven ' fibres'. The very thin periplast of a pectic nature covered by very thin, transparent, oval, two-layered, sculptured, exceptionally large, dimorphic scales, visible when dry under the light microscope, details visible only under the electron microscope. Large scales oval, bipartite, saucer-shaped, with a wide rim delimited from an oval centre by a ridge, 1.9 x 2.4 to 2.2 x 2.9 µm, with the base showing a radiating pattern of ridges on the surface towards the body, the outer surface patternless. The small scales, round to oval, 0.7 x 0.9 to 1.1 x 1.4 µm, with the relatively patternless rimmed face away from the body and the face with the pattern of radiating ridges towards the body. Scale distribution a single layer over the body with small scales filling interstices between large. Cells uninucleate, no stigma. Chromatophores appearing striated, usually two or four, occasionally one or six, golden brown; in motile phase usually ellipsoid or oblong, parietal, with a single globular body (pyrenoid) attached by a constricted neck to inner face near one margin slightly nearer to the non-flagellar pole than the flagellar pole; in non-motile phase deeply lobed or stellate. Lipoids and leucosin produced. Ejectile muciferous bodies generally distributed in peripheral cytoplasm but usually more numerous at flagellar pole. Nutrition phototrophic and/or phagotrophic. Non-toxic to fish. In motile phase asexual reproduction by fission into two, three or occasionally four daughter-cells of equal or unequal size; in non-motile phase reproduction (asexual?) by successive fission of amoeboid cells to produce four daughter-cells with thin smooth walls; motile phase probably liberated from walled daughter-cells through a pore.

Morphology:

Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source:

Prymnesium chiton compiled by Jeremy R. Young viewed: 16-5-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20388 Go to Archive.is to create a permanent copy of this page - citation notes

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