Anthosphaera


Classification: Coccolithophores -> Holococcoliths -> tubeless -> Anthosphaera
Sister taxa: Anthosphaera, Sphaerocalyptra, flat (coccolithaceae HOLs), flat dimorphic, fried egg monomorphic, t. tubeless-minute,

Distinguishing features: fried egg shape, dimorphic (CFCs with large leaf-like process)


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
BCs minute (<1 µm) rounded protrusion typically with multiple openings, and well separated from the rim.

BCs elliptical with low, rounded, protrusion; perforations barely visible

Like S. molischii HOL but BCs small, with irregular crystallites

Anthosphaera species with ornamented coccoliths; CFCs with ornamented blade ending in spine-like rows of crystallites. BCs with large perforations separated by radial rows of crystallites; concave distal surface with a flange and a central distally pointed triangle.

Lke S. molischii HOL but with prominent, oblique perforations, often conical

BCs minute, 0.5-0.7µm, flattened

Specimens which cannot be assigned to established species

Taxonomy:

Citation: Anthosphaera Kamptner, 1937
Rank: Genus
Type species: Anthosphaera fragaria Kamptner, 1937
Notes & discussion: The species taxonomy of Anthosphaera is not very well worked out, mainly because it is both rather rare and morphologically variable. The type species A. fragaria has been shown by Triantaphyllou et al. (2016) to be a life cycle phase of and junior synoym of Syracosphaera molischii. As in other similar cases it seems, however, preferable to leave the other species in Anthosphaera pending elucidation of their life-cycles.

Farinacci & Howe catalog pages: Anthosphaera + *

Distinguishing features: fried egg shape, dimorphic (CFCs with large leaf-like process)


Morphology remarks:
BCs low flat domes with flat monolayer basal rim and central protrusion, often radial spokes between rim and protrusion. Thes have often been described as calyptroliths but they are rather atypical. Crystallites rather irregular, blocky.
CFCs with basal rim and monolayer leaf-like process (a variant on the helladolith theme, termed fragarioliths).
See Kleijne (1991) and Cros & Fortuño (2002) for more discussion.

Search data:
TagsLITHS: holococcolith, elliptical,
MetricsLith size: 0.4->1.8µm;
Sources:
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 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:

Cros, L. & Fortuño, J.-M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina, 66: 186. GS

Kamptner, E. (1937). Neue und bemerkenswerte Coccolithineen aus dem Mittelmeer. Archiv für Protistenkunde, 89: 279-316. GS

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

Triantaphyllou, M.; Karatsolis, B.; Dimiza, M.D.; Malinverno, E.; Cerino, F.; Psarra, S.; Jordan, R.W. & Young, J.R. (2016). Coccolithophore combination coccospheres from the NE Mediterranean Sea: new evidence and taxonomic revisions. Micropaleontology, 61(6): 457-472. GS


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Anthosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-5-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=48 Go to Archive.is to create a permanent copy of this page - citation notes



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