Bathropyramis woodringi

Classification: rads_cenozoic -> Theoperidae -> Acropyramiidae -> Bathropyramis -> Bathropyramis woodringi
Sister taxa: B. aeshna, B. ramosa, B. sanjoaquinensis, B. scalaris, B. spongiosa, B. timorensis, B. woodringi, B. sp.


Citation: Bathropyramis woodringi Campbell & Clark 1944
Rank: species
Basionym: Bathropyramis woodringi
Taxonomic discussion: Campbell and Clark 1944

Catalog entries: Bathropyramis woodringi

Original description: Shell broadly pyramidal (30-28°),relatively wide at apertural end (sometimes reaching 0.67 total length in diameter); apex rounded, almost globular, scarcely pinched off from pyramid below it, side walls plane; eight divergent radial beams forming edges of nine plane surfaces which form sides; these radial beams relatively thin, externally sharp-edged and raised; parallel horizontal bars in nine to eleven rows, rather thicker than beams and similarly with raised edges; pores subrectangular with rounded corners enclosed by beams and bars and with wide frames, approximately 80 to 100 pores in whole shell, lower three or four rows of pores less rounded than those of upper tiers which are nearly circular, enclosed with much thicker frames, and with a coarse arachnoidal network subdividing each pore into a number of smaller areas; wall everywhere hyaline.

Length, up to 210µm; diameter of aperture, up to 140µm; of largest pores 17.6 by 15.4µm. Distinguishing characters (rw): Bathropyramis woodringi n. sp. is more broadly pyramidal and with fewer rings of pores than either acephala (Haeckel, 1887) or quadrata (Haeckel, 1887), less squat than trapezoides (Haeckel, 1887), and not discoidal like interrupta (Haeckel, 1887) and medusa (Haeckel, 1887). It approaches, in apical characters, Sethopyramis (such as quadrata Haeckel, 1887) but is much more broadly pyramidal.
All other species of subgenus Acropyramis are recent and occur at 0-2900 fathoms, in both Atlantic and Pacific, warmer waters. Phylogeny (rw): Relationship is very close and in some instances it is difficult to assign a species to one or other of these genera. Haeckel (1887) suggests that Bathropyramis was derived from Sethopyramis by loss of cephalis, and woodringi n. sp., as might be expected in a late fossil species, seems intermediate in this character. Clark and Campbell (1942) did not find Bathropyramis in Eocene of California.
Remarks on original description: [Campbell and Clark here list this species under the subgeneric name Acropyramis and include the subgeneric name in the species name.


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:


Campbell, A. S. & Clark, B. L. (1944a). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs


Bathropyramis woodringi compiled by the radiolaria@mikrotax project team viewed: 16-4-2021

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