Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Hymenomonas Coccoliths with serated distal margin | Hymenomonas coronata Hymenomonas globosa Hymenomonas lacuna Hymenomonas roseola Hymenomonas krejcigrafii Hymenomonas sp. | ||||
Jomonlithus Murolith coccoliths with simple rim, partially calcified specimens show beaded ultrastructure. | |||||
Ochrosphaera Coccoliths with well-developed basal flange and sometimes with distal flange |
Taxonomy:
Distinguishing features:
Parent taxon (Coccolithales): 2N: Mostly placolith heterococcoliths with V-unit forming the distal shield; R-unit the proximal shield. Non-motile
N: Form holococcoliths formed of single block, or non-calcifying
This taxon: 2N: cells motile, bearing muroliths with open central-area; proximal and distal flanges variably developed. Coccosphere large, monomorphic with many small coccoliths. Neritic.
N: non-calcifying.
Farinacci & Howe catalog pages: Hymenomonadaceae
Morphology:
They differ from Pleurochrysidaceae by the absence of a second cycle of units.
See also Manton & Peterfi (1969), Braarud (1954).
Ecology & Biogeography
Biology & life-cycles
Phylogenetic relations
Lith size: 0.8->2.5µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Miocene Epoch (5.33-23.03Ma, base in Aquitanian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Braarud, T. (1954). Coccolith morphology and taxonomic position of Hymenomonas roseola Stein and Syracosphaera carterae Braarud & Fagerland. Nytt Magasin for Botanikk. 3: 1-4. gs Fresnel, J. & Probert, I. (2005). The ultrastructure and life cycle of the coastal coccolithophorid Ochrosphaera neapolitana (Prymnesiophyceae). European Journal of Phycology. 40(1): 105-122. gs Fresnel, J. (1994). A heteromorphic life cycle in two coastal coccolithophorids, Hymenomonas lacuna and Hymenomonas coronata (Prymnesiophyceae). Canadian Journal of Botany. 72: 1455-1462. gs Manton, I. & Peterfi, L. S. (1969). Observations on the fine structure of coccoliths, scales and protoplast of freshwater coccolithophorid Hymenomonas roseola Stein, with supplementary observations on the protoplast of Cricosphaera carterae. Proceedings of the Royal Society of London. 172: 1-15. gs Senn, G. (1900). Chrysomonadineae. In, Engler, A. & Prantl, K. (eds) Die natürlichen Pflanzenfamilien. Engelmann, Leipzig 151-167. gs References:
Hymenomonadaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=745 Go to Archive.is to create a permanent copy of this page - citation notes |
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