Hymenomonas prenanti


Classification: Coccolithophores -> hidden -> deleted -> Hymenomonas prenanti
Sister taxa: << < Ceatlithus cristatus, Ceratolithus cornulum, Chrysotila pseudoroscoffensis, Clausicoccus cribellum, C. binodata, C. zachosii, D. alata, D. magnolia, D. albitectus, Dictyococcites onustus, Discoaster blackstockae, Discoaster neohamatus, F. pileatus group, Futyania petalosa nova, Futyania spuriosa, Hymenomonas prenanti, Lithostromation deflandrei, Lithostromation reginum, N. quadrata, N. primitivus, Pappomonas flabellifera var x, P. sp. type 2, P. HOL cf arctica, P. iugifera HOL, Porsilidia, Reticulofenestra callida, S. umbrellus group, Sphenolithus pospichalii, Sphenolithus umbrellus group, Sphenolithus verensis, > >>

Distinguishing features: Coccoliths elliptical with moderately high walls and no inner structure, dimorphic with low and high liths. Perforate wall fabric. FRESHWATER


Taxonomy:

Citation: Hymenomonas prenanti Lecal 1965

Farinacci & Howe catalog pages: Hymenomonas prenanti + *

Distinguishing features: Coccoliths elliptical with moderately high walls and no inner structure, dimorphic with low and high liths. Perforate wall fabric. FRESHWATER


Morphology remarks: Described by Lecal (1965) as having structure intermediate between heterococcoliths and holococcoliths. However, re-examintion of her published TEMs in light of modrn knowledge of the range of crystallite fabrics shown by holococcoliths fdoes not support this.

These holococcoliths are similar to  Calcicasphaera but do correspond to any of the species described by Kleijne 1991. They are higher and less blocky than H. blokii and clearly different from the other two species.

Ecology & Biogeography: Freshwater - described from a stream in SW France

Biology & life-cycles: This is the only holococcolith we know of decribed from freshwater so it possible that it is the alternate life-cycle phase of the realtively well-known heterococcolith H. roseola.

Search data:
TagsLITHS: holococcolith, elliptical, RIM: H: tube (Holos), CA: vacant,
CSPH: not known, monomorphic, V-UNITS: none, R-UNITS: all, rim,
MetricsLith size: 0->0µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

See also: Hymenomonas roseola - possible alternate life-cycle phase.;

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Kleijne, A., (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology, 17: 1-76.GS

Lecal, J., (1965). Un nouvel Hymenomonas: H. prenantii n. sp. [Coccolithophoridés]. Annales de Limnologie, 1: 155-162.GS


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Hymenomonas prenanti compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-4-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=751 Go to Archive.is to create a permanent copy of this page - citation notes



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