Translator Disclaimer
3 February 2022 A Morphological Comparison of Two Cladopyxidacean Dinoflagellates: The Extant Micracanthodinium setiferum and the Fossil Cladopyxidium saeptum (Dinophyceae, Gonyaulacales)
Kenneth Neil Mertens, M. Consuelo Carbonell-Moore, Kristina Gardner
Author Affiliations +
Abstract

Among dinoflagellates, extant cladopyxidaceans may provide a missing link to better understand the first evolutionary transformations from ancestral configurations toward the more abundant and more derived patterns in Gonyaulacales and Peridiniales. A restudy of the extant, motile-defined Micracanthodinium setiferum using plankton samples from the Indian and Atlantic oceans and the Mediterranean Sea demonstrates that the correct plate formula is Po, Pt, X, 3′ + *4′, 4a, 7″, 7C, 4S, ?6‴, 0p, 2′‴. A ventral pore is found between 1′, 3′ and *4′. A restudy of the extinct, fossil-defined Cladopyxidium saeptum from the upper Paleocene of Delaware (USA), demonstrated the presence of an identical tabulation. A ventral pore (= porichnion) was positioned between *1′ and 7″. Cladopyxidium is morphologically closer to Micracanthodinium than to Cladopyxis. Since Cladopyxidium has been extinct since the middle Eocene, it is unlikely that Micracanthodinium and Cladopyxidium have a direct biological link; the close morphological similarity between them does, however, suggest an important phylogenetic relationship between them in the evolution of cladopyxidaceans.

© 2021 AASP – The Palynological Society
Kenneth Neil Mertens, M. Consuelo Carbonell-Moore, and Kristina Gardner "A Morphological Comparison of Two Cladopyxidacean Dinoflagellates: The Extant Micracanthodinium setiferum and the Fossil Cladopyxidium saeptum (Dinophyceae, Gonyaulacales)," Palynology 46(1), 1-17, (3 February 2022). https://doi.org/10.1080/01916122.2021.1934908
Published: 3 February 2022
JOURNAL ARTICLE
17 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

Share
SHARE
KEYWORDS
dinoflagellates
Eocene
Kofoidian
Paleocene
partiform
porichnion
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top