Nannotax3 - ntax_non_cocco - Dicrateria Nannotax3 - ntax_non_cocco - Dicrateria


Classification: ntax_non_cocco -> Haptophytes -> Prymnesiales -> Prymnesiaceae -> Dicrateria
Sister taxa: Corymbellus, Dicrateria, Haptolina, Hyalolithus, Petasaria, Prymnesium, Pseudohaptolina

Daughter taxa (time control age-window is: 0-800Ma)
Dicrateria inornata
No scales
Dicrateria rotunda
Bears two types of plate-like scales, with sparse radial ribs
Dicrateria sp.
Specimens which cannot be assigned to established species


Citation: Dicrateria Parke 1949
taxonomic rank: Genus
Type species: Dicrateria inornata Parke 1949
Taxonomic discussion: The monospecifc genera Dicrateria and Imantonia were revised and discussed by Green & Pienaar (1977) who placed them both in the Isochrysidales based on absence of a delveloped haptonema, although a vestigial one does occur. The two were very similar but scales were only developed in Imantonia.  Edvardsen et al. (2000) reclassified Imantonia rotunda into the Prymnesiales based on molcular genetics.  Bendif et al. (2013) showed that Dicrateria inornata should also be placed in the Prymnesiales and that it had virtually identical SSu rDNA sequences to D. inornata. Following this they merged the two genera.

Catalog entries: Dicrateria, Imantonia

Original description: Cellula natante, solitaria, nuda, periplasto differentiae carente praedita; protoplasto rigidiore, formam praebente immutabilem; cellula sphaeroidi subovatave; deest sulcus; 2 flagellis, longitudine paribus, ex granulo basali distincto exsistentibus in parte cytoplasmatis hyalina sito; 2 chromatophoris magnis parietalibus crateriformibus fulvis contrapositis; nucleo mediocri pro- pius polum ilium sito ex quo exsisrunt flagella; cellula pabulum holophytica; nee oleo nee leucosino indigente; sine sexu propagatur fissione per gradum mobilem; cysto intra cellulam confecto; cystis sphaeroidibus subovatisque cum membrana externa laevi; non deest multiplicationis genus palmelloidem per gradum effectae.

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


Reynolds, N. (1974). Imantonia rotunda gen. et sp. nov., a new member of the Haptophyceae. British Phycological Journal. 9: 429-434. gs


Dicrateria compiled by Jeremy R. Young viewed: 21-7-2024

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