radiolaria - rads_cenozoic - Botryostrobus bramlettei

Botryostrobus bramlettei


Classification: rads_cenozoic -> Artostrobiidae -> Botryostrobus -> Botryostrobus bramlettei
Sister taxa: B. aquilonaris, B. auritus, B. bramlettei, B. hollisi, B. joides, B. kerguelensis, B. miralestensis, B. rednosus, B. sp.
Sub-taxa & variants (time control age-window is: 0-800Ma)
Botryostrobus bramlettei bramlettei

neptune records:
Botryostrobus bramlettei costatus

neptune records:
Botryostrobus bramlettei pretumidulus

neptune records: 3
Botryostrobus bramlettei reedi

neptune records:
Botryostrobus bramlettei seriatus

neptune records: 6
Botryostrobus bramlettei tumidulus

neptune records: 165

Taxonomy

Citation: Botryostrobus bramlettei (Clark & Campbell 1944) Caulet 1979
Rank: species
Basionym: Botryostrobus bramlettei

Taxonomic discussion:
(Campbell & Clark 1944 p.53, pl.7, figs.10-14 as Lithomitra); Nigrini 1977 p.248-249, pl.1 figs.7&8; Caulet, 1979

Catalog entries: Lithomitra bramlettei

Original description: Shell small, elongated (2.0 maximum, or 3.3 apertural diameters, in length), with conspicuously swollen third joint, one of important distinguishing characters of species; cephalis small, rather smooth, caplike, not much pitted, apically rounded, and laterally convex; shell-joints subequal in length, third and fifth shell-joints perhaps a little longer than upper ones, strictures well marked, sometimes by transverse lines as well as by changes in lateral contour, five joints forming shell exclusive of cephalis, first two bulged like old-fashioned wedding rings and together subconical (30°), third ring greatly swollen (1.65 apertural diameter in diameter), fourth segment much less swollen than others, and ultimate one subcylindrical, its free edge squarely truncated, minutely toothed with subequal, subregular, discrete teeth, and its diameter only 0.3 total length; wall not especially thick, rather uniform, thinnest in ultimate shell-joint, grayish; pores on cephalis rather numerous, tiny, subcircular, on shell-joints squarish, in four to seven vertical tiers of 16-36 pores in a transverse row, these pores closely set, subuniform, subequidistant, in sharply distinct rows both vertically and horizontally, surface with subvertical lines limited to upper part of swollen joint, otherwise smooth.

Length, 150µm; diameter, maximum, 70µm, of largest pores, 6.6µm. Distinguishing characters (rw): Large suites of this common species available in this collection. Considerable variation in nearly all characters, yet essential characters remain distinct. In some individuals, ultimate segment contracts, in others it is laterally bulged, and in some it even flares slightly. Swollen joint is not so apparent in a few individuals as in majority of forms, and, in a few, pores tend to become subhexagons. Dimensions differ among various specimens, although not so much as to suggest other than slight variations.
Lithomitra bramlettei n. sp. resembles Siphocampe malagaensis n. sp. in general form but differs in that third rather than second shell-joint is swollen, ultimate joint is subcylindrical rather than subconical, and in its stouter proportions as well as lack of tubular accessory opening. Differs from biconvexa n. sp. in lateral contour and distinctness of swollen segment.
Remarks on original description: [Campbell and Clark here list the species under the subgeneric name Lithomitrissa and include the subgeneric name in the species name.
Questionably synonymized with Botryostrobus euporus (Ehrenberg) Petrushevskaya 1975c
New name Botryostrobus bramlettei (Campbell and Clark) in Nigrini 1977]

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

Caulet, J. (1979). Les depot a radiolaires d'age Pliocene superieur a Pleistocene dans l'ocean Indien central:Nouvelle zonation biostratigraphique. Mémoires du Muséum National d'Histoire naturelle. 43: 119-141. gs

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


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Botryostrobus bramlettei compiled by the radiolaria@mikrotax project team viewed: 28-11-2021

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