Siphocampe elizabethae

Taxonomy

Catalog entries: Lithomitra elizabethae

Original description: Shell small, smooth, with two strictures, generally shaped like a finger-cot and with roughly toothed margin; shell divided into three joints or segments by two horizontal strictures, the apical segment hemispherical (approximately 0.2 total length, distally somewhat flattened, basally limited by a sharp change in length), its sides rather strongly bulging especially in the middle, a little asymmetrical; third segment nearly cylindrical (about the same length as the one above it), its midregion somewhat bulging; apical segment without pores, or at the very most with a single row, perhaps, around the base, and these exceedingly small, middle segment with four tiers of pores, approximately sixteen pores in a row, uniform, oval, well-spaced, double-rimmed, third segment with three tiers of pores, sixteen or more in a row, rows not perfectly horizontal, perhaps 5° off horizontal, pores of different sizes, some much larger than others, ovoidal, elongate, droplet-shaped, or even irregular, those of the apertural row generally smaller and more irregular than others, the apical two rows closer together, the marginal row rather near the aperture; wall comparatively thick, very dark, closely following the shell contour and not modified at the strictures, surface without especial ornamentation, smooth; apertural rim ragged, with small, irregularly shaped, differently sized projections.
Remarks on original description: [The authors here lists this species under the subgeneric name Lithomitrissa and include the subgeneric name in the species name.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P 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: Siphocampe elizabethae, synonyms included - Lithomitra elizabethae; Lithomitrella elizabethae; Siphocampe elizabethae; Theocampe elizabethae;
• See also space-time plot :: Samples map :: Parent: Siphocampe

Siphocampe elizabethae compiled by the radiolaria@mikrotax project team viewed: 10-12-2023 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=205384 Go to Archive.is to create a permanent copy of this page - citation notes

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