Classification: ntax_cenozoic -> Coccolithales -> Hymenomonadaceae -> Hymenomonas
Sister taxa: Hymenomonas, Jomonlithus, Ochrosphaera

Daughter taxa (time control age-window is: 0-800Ma)
Hymenomonas coronata
Coccoliths tube only, with denticulate margin but no funnel.
Hymenomonas globosa
Coccolith with tube ca. 0.5 µm high, and funnel ca. 0.5 µm high
Hymenomonas lacuna
Coccoliths similar to H. globosa but higher and tube better developed (tube ca 0.8µm high)
Hymenomonas roseola
Freshwater - coccoliths almost identical to those of H. globosa
Hymenomonas krejcigrafii
Fossil coccolith species of similar size and shape to modern Hymenomonas. Thick-walled, elliptical.
Hymenomonas sp.
Specimens which cannot be assigned to established species


Citation: Hymenomonas Stein, 1878
Rank: Genus
Type species: Hymenomonas roseola Stein, 1878

Distinguishing features: Coccoliths with serated distal margin

Farinacci & Howe catalog pages: Hymenomonas

Morphology: Cells with long flagella, haptonema vestigial or absent.
Coccoliths broadly elliptical. Formed of 14-16 non-imbricate elements; formed of basal flange, vertical tube and flaring distal funnel; elements have pointed ends

Search data:
TagsLITHS: murolith, elliptical, CA: vacant,
CSPH: equant, monomorphic,
MetricsLith size: 0.8->2µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Aquitanian Stage (0% up, 23Ma, in Aquitanian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Gayral, P. & Fresnel, J. (1979). Revision du genre Hymenomonas Stein. A propos de l'étude comparative de deux Coccolithacées: Hymenomonas globosa (Magne) Gayral et Fresnel et Hymenomonas lacuna Pienaar. Revue Algologique N.S. 14(2): 117-125. gs

Stein, F. R. v. (1878). Der Organismus der Infusionsthiere nach eigenen Forschungen in systematischer Reihenfolge bearbeitet. Engelmann, Leipzig. 154-154. gs


Hymenomonas compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-5-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=746 Go to Archive.is to create a permanent copy of this page - citation notes

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