radiolaria - rads_cenozoic - Botryostrobus bramlettei 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. parsonsae, 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


Citation: Botryostrobus bramlettei (Clark & Campbell 1944) Caulet 1979
Rank: species
Basionym: Botryostrobus bramlettei
1944 Lithomitra (Lithomitrissa) bramlettei - Campbell and Clark p.53; Pl. 7, figs 10-14
1977 Botryostrobus bramlettei - Nigrini p.248; Pl. 1,figs. 7.8
1989 Botryostrobus bramlettei - Alexandrovich Pl. 3, fig. 5
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.
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]


Published descriptions

Nigrini 1977 - Lithomitra bramlettei

Description: Shell usually thick-walled; surface rough. Cephalis hemispherical wi th a few subcircular pores and well-developed vertical tube, approximately cylindrical but tapering distally. Tube directed obliquely upward at about 45°. Sometimes thornlike apical horn present. Collar stricture indistinct. Thorax inflated bearing three transverse rows of subcircular pores. Lumbar stricture apparent, but not pronounced. Abdomen and first post-abdominal segment similar in shape to thorax but somewhat larger, fourth segment being the largest in both length and breadth. Four transverse rows of subcircular pores on abdomen; three to six on fourth segment. First four segments form a cone; shell then narrows sharply to an approximately cylindrical (sometimes symmetrically sinuous) segment. Termination may be poreless band with or without small terminal teeth or in some specimens the peristome consists of two poreless bands flanking single row of subquadrangular pores. Dimensions (based on 15 specimens): Total length 105-130µ; maximum breadth 60-65µ.

Range: Very rare to few from the Cannartus (?) petterssoni Zone to the Stichocorys peregrina Zone. Phylogeny: It seems that B. aquilonaris may be descended from B. miralestensis. It is interesting to note that the range of B. bramlettei neatly spans the gap between the uppermost occurrence of B. miralestensis and the lowermost occurrence of B. aquilonaris. suggesting that bramlettei is a transitional form.

Remarks: This species may be distinguished from B. aquilonaris by its more pronounced lumbar and post-lumbar strictures and by the characteristic change in shape from conical to cylindrical. B. aquilonaris is more spindle-shaped and is generally larger.

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:


Alexandrovich, J. M. (1989). Radiolarian biostratigraphy of ODP Leg 111, Site 677, eastern equatorial Pacific, late Miocene through Pleistocene. Proceedings of the Ocean Drilling Program, Scientific Results. 111: 245-262. gs

Campbell, A. S. & Clark, B. L. (1944). 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, Paris. 43: 119-141. gs

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


Botryostrobus bramlettei compiled by the radiolaria@mikrotax project team viewed: 30-11-2023

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