Nannotax3 - ntax_non_cocco - Pavlovaceae Nannotax3 - ntax_non_cocco - Pavlovaceae


Classification: ntax_non_cocco -> Haptophytes -> Pavlovales -> Pavlovaceae
Sister taxa: Pavlovaceae

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa

Diacronema ennorea
Diacronema lutheri
Diacronema noctivaga
Diacronema virescens
Diacronema viridis
Diacronema vlkianum
Diacronema sp.


Exanthemachrysis gayraliae
Exanthemachrysis sp.


Pavlova calceolata
Pavlova granifera
Pavlova gyrans
Pavlova pinguis
Pavlova sp.


Rebecca helicata
Rebecca salina
Rebecca sp.


Citation: Pavlovaceae Green 1976
Rank: Family

Catalog entries: Pavlovaceae

Original description: With the characters of the Order. [Motile or palmelloid unicellular organisms; if non-motile, producing motile swarmers. Motile cells with two unequal, often anisokont, heterodynamic flagella and a haptonema; the shorter flagellum sometimes reduced to a vestigial structure.] Cells compressed or not compressed; flagella and haptonema inserted ventrally or laterally, the anterior flagellum bearing a garniture of fine hairs alone or fine hairs with small dense bodies; the posterior flagellum often bearing fine hairs but never with dense bodies; the haptonema demonstrating in the free part progressive distal reduction in the number of microtubules from approximately 8 at the base. Stigma present or absent. A pit or canal present penetrating the cell in front of the anterior flagellum, sometimes associated with the stigma, if present. Storage metabolite in the form of refractive bodies, known to be paramylon in some species.


Pavlovophyceae cells are solitary or may form non-motile aggregations. Solitary cells are laterally flattened and typically highly metabolic. The anisokont flagella, when present, are inserted sub-apically or sometimes ventrally, and surround a non-coiling, often vestigial, haptonema. Flagellar movement is markedly heterodynamic. Intracellular storage bodies are present in some species, likely containing paramylon-like storage carbohydrates in crystalline microfibrillar units forming granules as described by Kiss and Triemer (1988). Crystalline inclusions rich in sulphur and barium and polyphosphate granules have been reported in some members of the class (Fresnel et al. 1979; van der Veer 1976). An eyespot is generally present in association with an invagination of the plasmalemma, but not associated with a flagellar swelling. [Bendif et al. 2011]

Geological Range:
Last occurrence (top): Extant. Data source: Total of range of 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 range of species in this database


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

Green, J. C. (1976b). Notes on the flagellar apparatus and taxonomy of Pavlova mesolychnon van der Veer, and on the status of Pavlova Butcher and related genera within the Haptophyceae. Journal of the Marine Biological Association of the United Kingdom. 56: 595-602. gs


Pavlovaceae compiled by Jeremy R. Young viewed: 23-3-2023

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