arrayname: original
Distinguishing features:
Parent taxon (Petasaria):
This taxon: Simlar to P. neolepis but with protruberance of variable length extending from rim of scales
Taxonomy:
Catalog entries: Petasaria protruberans
Distinguishing features:
Parent taxon (Petasaria):
This taxon: Simlar to P. neolepis but with protruberance of variable length extending from rim of scales
Original description: Cell shape unknown, only collapsed cells observed. Cell cover composed of 20-30 circular to oval siliceous scales, 2.7-3.1 μm x 2.5-2.9 μm. Distal surface of scale perfo- rated, except for a centrally raised hyaline patch and deep rectangular or circular groove. All scales with a short to long protuberance (0.3-4.0 μm x 0.3-1.3 μm) extending from rim of hyaline area, terminating in three to five short finger-like structures. Proximal surface with raised hyaline structure (corresponding to groove on distal side, and of similar shape) possessing short projections directed towards hyaline area. Rim slightly curved towards proximal side, more prominent near hyaline area and along protuberance.
Type images:
Morphology:
Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton
First occurrence (base): within no known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY]
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 compiled by Jeremy R. Young viewed: 25-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20286 Go to Archive.is to create a permanent copy of this page - citation notes |
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