radiolaria - rads_cenozoic - Lophophaena macrencephala

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radiolaria - rads_cenozoic - Lophophaena macrencephala radiolaria - rads_cenozoic - Lophophaena macrencephala

Lophophaena macrencephala

Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Lophophaena -> Lophophaena macrencephala
Sister taxa: L. apiculata, L. arctissa, L. arie, L. buetschlii, L. capito, L. circumtexta, L. clevei, L. cylindrica, L. decacantha, L. galeaorci, L. hispida, L. josephinus, L. macrencephala, L. mugaica, L. nadezdae, L. polycyrtis, L. radians, L. rioplatensis, L. sibirica, L. simplex, L. tekopua, L. thaumasia, L. variabilis, L. witjazii, Lophophaenoma, L. sp., Lophophaenoma sp.

Taxonomy

Citation: Lophophaena macrencephala Clark & Campbell 1945

Taxonomic rank: species

Basionym: Lophophaena macrencephala

Synonyms:

From Suzuki Paleotax db:

1945 Lophophaena (Lophophaenula) macrencephala n. sp. Clark & Campbell p. 41, pl. 7, figs. 6-9
1971 Lophophaena cf. macrencephala (Clark et Campbell) [sic] Petrushevskaya pl. 56, figs. 9, 10
1971 Lophophaenoma sp. C Petrushevskaya pl. 56, fig. 14, pl. 63, figs. 1, 2 (non pl. 56, fig. 15)
1971 Lophophaenoma sp. C Petrushevskaya pl. 56, fig. 15 (only)
1978 Lophophaena macrencephala Clark et Campbell group Dzinoridze et al. pl. 29, fig. 20, pl. 32, fig. 36
1979 Lophophaena macrenecephala Clark et Campbell Kozlova & Petrushevskaya p. 126, figs. 348, 349

Taxonomic discussion: Clark and Campbell, 1945, p.41, pl.7, figs.6-9

Catalog entries: Lophophaena macrencephala

Type images:

type image: L. macrencephala

Original description: Small, urceolate shell having the cephalis and thorax subequal, the former globular with the proximal end squarely truncate, and distally bearing at least 4 short, conical, free, radial horns of which the frontal one is sometimes bifurcate, the longer horn (generally frontal) is less than the radius of the cephalis, the remainder being less than 0.5 that length; cephalis and thorax having a sharp, deep transverse collar stricture (its diameter 0.5 equator of cephalis); thorax distally truncated, generally bell-shaped with convex sides, usually being subsymmetrical, generally about 0.5 total length in length, and having the apertural margin squarely truncated and entire; often this margin is similar to or as much as twice the equator of the cephalis in diameter; pores of both cephalis and thorax nearly similarly circular except near the collar stricture where they are elliptical on the cephalis and again in the lower thorax where they are minutely squarish, or there are large elliptical ones sometimes in regular vertical rows save for odd interpolated small ones, the pores being rather closely set, numbering about a dozen (or more) across the cephalic equator, and 10 (or more) along the length of the thorax; generally the pores are of nearly similar size except as noted; wall nearly uniformly thin.
Remarks on original description: The authors here list Lophophaena macrencephala under the subgeneric name Lophophaenula and include the subgeneric name in the species name.[comment from RadWorld database]

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: Lophophaena macrencephala, synonyms included - Lophocyrtis macrencephala; Lophophaena macrencephala;
See also space-time plot :: Samples map :: Parent: Lophophaena

References:
Clark, B. L. & Campbell, A. S. (1945b). Radiolaria from the Kreyenhangen Formation near Los Banos, California. Geological Society of America, Memoir. (10): 1-66. gs

Lophophaena macrencephala compiled by the radiolaria@mikrotax project team viewed: 22-3-2025

Taxon Search:

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