Exanthemachrysis gayraliae


Classification: ntax_non_cocco -> Haptophytes -> Pavlovales -> Pavlovaceae -> Exanthemachrysis -> Exanthemachrysis gayraliae
Sister taxa: E. gayraliae, E. sp.

Taxonomy:

Citation: Exanthemachrysis gayraliae Lepailleur 1970
Rank: Species
Basionym: Exanthemachrysis gayraliae Lepailleur 1970

Catalog entries: Exanthemachrysis gayraliae


Morphology: The dominant stage consists of non-motile colonies of slightly ovate cells embedded in multiple layers of mucilage. The parietal plastid is brownish-green with a bulging pyrenoid that forms a visible protuberance on the cell body. The flagella of motile cells do not possess hairs and a haptonema is present. A distal string of pearl-like structures is present on the posterior flagellum , a feature that has never previously been described. Thylakoid lamellae exhibit a helicoidal arrangement as noticed by van der Veer (1979) for Rebecca salina and R. helicata, formerly Pavlova mesolychnon (van der Veer 1969) and Pavlova helicata (van der Veer 1972) respectively. The bulging pyrenoid is delimited from chloroplast stroma by osmiophilic vesicles forming an eyespot. The cell body is devoid of knob scales. [Bendif et al. 2011]

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:

References:

Bendif, E. M. et al. (2011). Integrative taxonomy of the Pavlovophyceae (Haptophyta): A reassessment. Protist. 162: 738-761. gs

Lepailleur, H. (1970). Sur un nouveau genre de Chrysophycées: Exanthemachrysis nov. gen. (E. gayralii nov. sp.). Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris. 270: 928-931. gs


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Exanthemachrysis gayraliae compiled by Jeremy R. Young viewed: 15-5-2021

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