radiolaria - rads_cenozoic - Siphocampe elizabethae radiolaria - rads_cenozoic - Siphocampe elizabethae

Siphocampe elizabethae


Classification: rads_cenozoic -> Artostrobiidae -> Siphocampe -> Siphocampe elizabethae
Sister taxa: S. acephala, S. altamontensis, S. arachnea, S. bassilis, S. daseia, S. elizabethae, S. grantmackiei, S. imbricata, S. lineata, S. minuta, S. modeloensis, S. nodosaria, S. pachyderma, S. quadrata, S. septata, S. stathmeporoides, S. sp.

Taxonomy

Citation: Siphocampe elizabethae (Clark&Campbell 1942)
taxonomic rank: species
Basionym: Lithomitra elizabethae Nigrini, 1977
Taxonomic discussion: (Clark and Campbell), 1942, p.92, pl.9, fig.18, as Lithomitra; Nigrini, 1977, p. 256, pl. 3, fig 6

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:

References:

Clark, B. L. & Campbell, A. S. (1942a). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs

Nigrini, C. A. (1977). Tropical Cenozoic Artostrobiidae (Radiolaria). Micropaleontology. 23(3): 241-269. gs


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Siphocampe elizabethae compiled by the radiolaria@mikrotax project team viewed: 30-5-2024

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