Heterorhabdus actinosus

Set number: 3114

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Heterorhabdus actinosus, Late Campanian, The specific location cannot be disclosed.

Set number: 3111

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Heterorhabdus actinosus, Late Maastrichtian, The specific location cannot be disclosed.

Set number: 3110

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Heterorhabdus actinosus, Late Albian, Folkestone, England

Set number: 3115

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Heterorhabdus actinosus, Middle Campanian, The specific location cannot be disclosed.

Set number: 3117

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Heterorhabdus actinosus, Middle Albian, Folkestone, England

Set number: 3116

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Heterorhabdus actinosus, Late Santonian, The specific location cannot be disclosed.

Set number: 3113

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Heterorhabdus actinosus, Early Maastrichtian, Mauritania, West Africa

Set number: 3112

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Heterorhabdus actinosus, Late Campanian, The specific location cannot be disclosed.

Final Epithet

Heterorhabdus actinosus Stover, 1966

Basionym

Coccolithus actinosus Stover, 1966

Synonyms

Cretarhabdus crenulatus hansmanii Bukry 1969

Cretarhabdella fragilis BLACK, 1971a

Polypodorhabdus paucisectus Black 1971a

Cretarhabdus leporarii Black, 1973

Description

Species of Heterorhabdus are constructed of a cretarhabdid pelaga surrounding a large central area spanned by a distinct axial cross that supports a distal process. The inter-cross area is occupied by lateral bars that delimit pores arranged in a single complete concentric cycle. Each quadrant typically contains three pores formed by two lateral bars, a feature characteristic of Heterorhabdus actinosus.

Optical Properties

Heterorhabdus actinosus exhibits first-order, slightly greyish-white interference colours. In plan view under crossed polars, the pelaga shows inclined extinction and length-fast (–) elongation.

References

Black, M. 1971a. Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society 38: 381-424.

Black, M. 1973. British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph 127: 49-112.

Bukry, D. 1969. Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles 51 (Protista 2): 1-79.

Stover, L. E. 1966. Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology 12(2): 133-167.