Nannotax3 - ntax_cenozoic - Hymenomonas lacuna

Hymenomonas lacuna

Classification: ntax_cenozoic -> Coccolithales -> Hymenomonadaceae -> Hymenomonas -> Hymenomonas lacuna
Sister taxa: H. coronata, H. globosa, H. lacuna, H. roseola, H. krejcigrafii, H. sp.


Citation: Hymenomonas lacuna Pienaar, 1976
Rank: Species
Taxonomic discussion: This has been regarded as a discrete species from H. globosa but it is extremely similar and close examination of the evidence suggests it is probably a junior synonym [my interpretation - JRY 2018] since:
It was, however, reported in Young et al (2003) that H. lacuna forms higher coccoliths than H. globosa, based on culture observations of I. Probert.

Distinguishing features:
Parent taxon (Hymenomonas): Coccoliths with serated distal margin
This taxon: Coccoliths similar to H. globosa but higher and tube better developed (tube ca 0.8µm high)

Farinacci & Howe catalog pages: Hymenomonas lacuna

Size: Cells 25-30µm

Cultures: strains of this species are maintained in culture, for details see Roscoff culture collection.

Search data:
TagsLITHS: murolith, elliptical, CA: vacant,
CSPH: equant, monomorphic,
MetricsLith size: 1->2µm; Segments: 14->15; Coccosphere size: 15->30µm;
Data source notes: RCC
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: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]

Plot of occurrence data:


Gayral, P. & Fresnel, J. (1976). Nouvelles observations sur deux Coccolithophoracées marines: Cricosphaera roscoffensis (P. Dangeard) comb. nov. et Hymenomonas globosa (F. Magne) comb nov. Phycologia. 15(339-355): -. gs

Lefort, F. (1975). Etude du quelques Coccolithophoracees marines rapportees aux genres Hymenomonas et Ochros_phaera. 15, 213-229. Cahiers de Biologie Marine. 1975(213-229): -. gs

Meier, K. J. S., Kinkel, H. & Young, J. R. (2014b). A note on calcareous nannoplankton from the Kieler Förde (Baltic Sea). Journal of Nannoplankton Research. 33(1): 29-37. gs V O

Pienaar, R. N. (1976). The microanatomy of Hymenomonas lacuna sp. nov. (Haptophyceae). Journal of the Marine Biological Association of the United Kingdom. 56: 1-11. gs

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue. 1: 1-132. gs V O


Hymenomonas lacuna compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-1-2022

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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