radiolaria - rads_cenozoic - Botryostrobus miralestensis

Botryostrobus miralestensis


Classification: rads_cenozoic -> Artostrobiidae -> Botryostrobus -> Botryostrobus miralestensis
Sister taxa: B. aquilonaris, B. auritus, B. bramlettei, B. hollisi, B. joides, B. kerguelensis, B. miralestensis, B. rednosus, B. sp.

Taxonomy

Citation: Botryostrobus miralestensis (Campbell and Clark) Petrushevskaya and Kozlova 1972
Rank: species
Basionym: Dictyocephalus miralestensis

Taxonomic discussion:
(Campbell & Clark) 1944 p.45 pl.6 figs.12-14 as Dictyocephalus; Petrushevskaya&Kozlova 1972 p.539 pl.24 fig.31; Nigrini 1977

Catalog entries: Dictyocephalus miralestensis

Original description: Shell stout (three apertural diameters in length); cephalis generally conical (33°), its apical portion caplike, rounded, sides plane, basal diameter 1.3 apertural diameters, and length 0.3 total length, with distinct but not accentuated transverse stricture; thorax generally barrel-like, with well-swollen sides, reaching maximum diameter (1.9 apertural diameters) near its middle and similarly 30° in upper and lower section above and below widest level; aperture squarely truncate, 0.33 total length in diameter, its margin entire, and region just above forms an internal tube leading to shell cavity; surface of cephalis heavily pitted, coarse, of thorax smooth; wall fairly uniform in thickness save in lip where it is thinner; pores of cephalis, upward of 64, well separated, deeply set, circular, some larger than others but all smaller titan in thorax, with wide lentils, of thorax in 10 vertical tiers of 14-24 (or more) pores in a transverse row, circular with a few upper ones squarish, shallow, and fairly well separated, double-contoured.

Length, total, 120µm; diameter, maximum, 60µm, aperture, 40µm, of thoracic pores, 3µm. Distinguishing characters (rw): Our figured specimen had a blob of excess shell material on one side of thorax near stricture.
Dictyocephalus miralestensis n. sp. resembles australis (Haeckel, 1887), a recent species, but has more pores on thorax with less strong double-contours, and with a greater difference between cephalis and thorax in stricture, structure, pores, and wall.
Remarks on original description: [Campbell and Clark here list the species under the subgeneric name Dictyoprora and include the subgeneric name in the species name.
New name Botryostrobus miralestensis (Campbell and Clark) in Petrushevskaya and Kozlova, 1972]

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:

References:

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

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

Petrushevskaya, M. G. & Kozlova, G. E. (1972). Radiolaria: Leg 14, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 14: 459-648. gs


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Botryostrobus miralestensis compiled by the radiolaria@mikrotax project team viewed: 27-9-2021

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