Nannotax3 - ntax_non_cocco - Hyalolithus tumescens Nannotax3 - ntax_non_cocco - Hyalolithus tumescens

Hyalolithus tumescens


Classification: ntax_non_cocco -> Haptophytes -> Prymnesiales -> Prymnesiaceae -> Hyalolithus -> Hyalolithus tumescens
Sister taxa: H. neolepis, H. tumescens

Distinguishing features:
Parent taxon (Hyalolithus):
This taxon: Scales have, in distal view, an indentation on one side of the central mound (= an off-centre swelling in proximal view).

Taxonomy:

Citation: Hyalolithus tumescens Abe et al. 2016
Taxonomic rank: species

Catalog entries: Hyalolithus tumescens

Distinguishing features:
Parent taxon (Hyalolithus):
This taxon: Scales have, in distal view, an indentation on one side of the central mound (= an off-centre swelling in proximal view).

Original description: Diagnosis. A fossil species of Hyalolithus characterized by scales with an indentation on one side of the central mound in distal view and an off-centre swelling seen in proximal view.

Description. Solid siliceous scales, circular to elliptical in shape. On distal side, scale with prominent marginal rim and perforated central mound, separated by narrow to wide hyaline area. Perforated area consists of about 30–150 circular to elliptical openings (pores) of variable size. One side of central mound with indentation and pit-like depression, always on long axis. On proximal side, perforated central area surrounded by hyaline margin. Swelling (corresponding to pit-like depression on distal side), perforated around the base, situated on long axis.

Type images:

Geological Range:
Notes: This form has only been recorded from two, middle Eocene, localities, so its total range is not constrained.
Last occurrence (top): within Middle Eocene Sub-Epoch (37.75-47.84Ma, top in Bartonian stage). Data source: Abe et al. 2016
First occurrence (base): within Middle Eocene Sub-Epoch (37.75-47.84Ma, base in Lutetian stage). Data source: Abe et al. 2016

References:

Abe, K., Tsutui, H. & Jordan, R. W. (2016). Hyalolithus tumescens sp. nov., a siliceous scale-bearing haptophyte from the middle Eocene. Journal of Micropalaeontology. 35: 143-149. gs


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Hyalolithus tumescens compiled by Jeremy R. Young viewed: 30-4-2025

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