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: Hyalolithus tumescens Abe et al. 2016
Compiled data
Original Description
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.
Size:
Etymology:
Extra details from original publication
Remarks. The siliceous scales of the type species Hyalolithus neolepis, like those of H. tumescens sp. nov., are solid, circular to elliptical in shape, with a prominent marginal rim and perforated central mound, separated by a narrow to wide hyaline area. However, the scales of H. neolepis are generally much smaller in size (2.9–7.9 μm long, 2.8–7.0 μm wide), with more (about 45–350) but smaller (0.1–0.3 μm long) openings. A small pit-like depression occurs rarely between the two central mounds on the distal side, with a corresponding centrally placed swelling (0.5– 0.7 μm in diameter) on the proximal side. The swelling is perforated seemingly all over the surface, whereas that of H. tumescens is perforated only near the base. We chose the word ‘swelling’ because it is part of the perforated surface not a separate structure and is thus unlike the hollow imperforate tube as seen in the exothecal coccoliths of Syracosphaera pulchra Lohmann.
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 References:
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Hyalolithus tumescens: Catalog entry compiled by Jeremy Young. Viewed: 17-2-2025
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