Nannotax3 - ntax_cenozoic - Acanthoica acanthos Nannotax3 - ntax_cenozoic - Acanthoica acanthos

Acanthoica acanthos


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Acanthoica -> Acanthoica acanthos
Sister taxa: A. quattrospina, A. acanthifera, A. acanthos, A. biscayensis, A. janchenii, A. maxima, A. sp A ⟩⟨ A. backmanii, A. cohenii, A. laffittei, A. sp.

Taxonomy:

Citation: Acanthoica acanthos Schiller 1925
Taxonomic rank: species
Synonyms: Anacanthoica acanthos (Schiller 1925) Deflandre 1952
Taxonomic discussion: Very similar to A. quattrospina apart from absence of apical and antapical spine coccoliths. It is rarely seen so possibly the observed specimens are simply incomplete A. quattrospina coccospheres. As discussed in Young & Bown (2014) the very close similarity of the A. acanthos and A. quattrospina means that placing them in separate genera is not useful.

Distinguishing features:
Parent taxon (Acanthoica): Body coccoliths with well-developed radial lath cycle, low mound in centre; coccospheres polymorphic, usually some coccoliths with well-developed spines
This taxon: Like A. quattrospina but lacking spine coccoliths, and rim broader

Farinacci & Howe catalog pages: A. acanthos *


Morphology:

Coccoliths with broad rim, 24-35 laths, low conical protrusion. See Kleijne (1992) for longer description.

Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, grill, process,
CSPH: equant, CFC, AAC, CROSS-POLARS: R-prominent,
Lith size: 2->2.5µm; Liths per sphere: 60->90
Data source notes: lith size from Kleijne 1992 (BC width)
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:

References:

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs

Kleijne, A. (1992). Extant Rhabdosphaeraceae (coccolithophorids, class Prymnesiophyceae) from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Scripta Geologica. 100: 1-63. gs

Schiller, J. (1925). Die planktonischen Vegetationen des adriatischen Meeres. A. Die Coccolithophoriden-Vegetation in den Jahren 1911-14. Archiv für Protistenkunde. 51: 1-130. gs

Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. 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. S1: 1-132. gs


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Acanthoica acanthos compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-1-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=6 Go to Archive.is to create a permanent copy of this page - citation notes
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