Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification/main database link: Petasaria protruberans Jordan, Malinverno, Šupraha, Thomsen et Young
Compiled data
Original Description
Size:
Etymology:
Extra details from original publication
Remarks: In the original diagnosis of Petasaria heterolepis (Moestrup 1979) no mention was made of forms with protuberances. Our specimens of P. protuberans show scales bearing a short (Pl. 7, fig. 5), intermediate (Pl. 7, fig. 6) or long (Pl. 7, figs. 7-8) protuberance. The distal groove and corresponding proximal raised structure is rectangular on those specimens with short to intermediate protuberances, whilst the groove/depression on specimens with longer protuberances is circular to oval, as in P. heterolepis. Here we have made no distinction between these two types of groove/depression and have assigned all protuberance-bearing specimens to P. protuberans. Whether the difference is meaningful taxonomically is not known at present.
Jordan, R. W. et al. (2016). Observations on the morphological diversity and distribution of two siliceous nannoplankton genera, Hyalolithus and Petasaria. Micropaleontology. 61(6): 439-455. gsReferences:
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Petasaria protruberans: Catalog entry compiled by Jeremy Young. Viewed: 17-2-2025
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