Lamprocyclas hannai

Taxonomy

Catalog entries: Calocyclas hannai

Original description: Shell rather large, stout (approximately 2.2 maximum diameters in length), generally bell shaped; apical horn stout (12°), with four equal, triangular blades fused down sides of cephalis, its tip sharp; cephalis generally conical (28°), apically angled due to triangular blades mentioned above, often asymmetrical, swollen slightly at middle and subcylindrical in lower section, its length 0.18 total length, and cervical diameter 0.31 maximum diameter of shell; thorax broadly truncate-conical (55°), usually with fairly convex sides (sometimes reaching its maximum above its base and cylindrical basally), and thoracic margin pinched off with a transverse stricture and always marked by an internal, transverse septum; abdomen barrel-shaped, approximately 0.37 total length in length of shell, sometimes abdomen reaches its maximum diameter near middle and at other times just a little above shell aperture; shell aperture contracted (0.72 maximum diameter in diameter), its margin with discrete, projecting, spinelike, sharp denticles; wall uniform, rather thick; pores of cephalis about 50, large, circular, scattered, and well separated, of thorax larger than those of cephalis, circular, 125 or more, scattered and separated, of abdomen, larger than those of thorax, subcircular to subrectangular, sometimes in pairs of small rectangles or otherwise altered, well separated, well scattered, and about 200.
Remarks on original description: [Campbell and Clark here list this species under the subgeneric name Calocycletta and include the subgeneric name in the species name.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested.
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Lamprocyclas hannai, synonyms included - Lamprocyclas hannai; Lamprocyrtis hannai;
• See also space-time plot :: Samples map :: Parent: Lamprocyclas

Lamprocyclas hannai compiled by the radiolaria@mikrotax project team viewed: 15-8-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204346 Go to Archive.is to create a permanent copy of this page - citation notes

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