radiolaria - rads_cenozoic - Siphocampe altamontensis

radiolaria - rads_cenozoic - Siphocampe altamontensis radiolaria - rads_cenozoic - Siphocampe altamontensis

Siphocampe altamontensis

Classification: rads_cenozoic -> Artostrobiidae -> Siphocampe -> Siphocampe altamontensis
Sister taxa: S. acephala, S. altamontensis, S. arachnea, S. bassilis, S. daseia, S. elizabethae, S. grantmackiei, S. imbricata, S. lineata, S. minuta, S. modeloensis, S. nodosaria, S. pachyderma, S. quadrata, S. septata, S. stathmeporoides, S. sp.

Taxonomy

Citation: Siphocampe altamontensis (Campbell and Clark 1944)

Rank: species

Basionym: Tricolocampe altamontensis Campbell & Clark 1944

Taxonomic discussion: (Campbell and Clark) 1944

Catalog entries: Tricolocampe altamontensis

Type images:

type image: T. altamontensis

Original description: Shell small and narrow (length 3 times the diameter), shaped like a test tube without flange; cephalis hemispherical, short, and a trifle asymmetrical; thorax truncate-conical (30°) and rather firmly united with cephalis, the 2 joints together having a length of 0.2 total length, and differentiated by only a trace of difference in lateral contour; abdomen usually subcylindrical or sometimes mildly biconical (23° in upper 0.5 and 20° in lower, inverted section, maximum diameter, in this instance, being at middle where it may reach 1.5 diameter of shell aperture), apertural margin the simple end of shell without special modification save that a little way above it lies a transverse line of pores which are a little smaller than ones immediately above; wall thin, strictly following external contour even to slight local modifications; surface smooth except for numerous subvertical wrinkles in cephalis and thorax, and in upper abdomen, in which wrinkles are quite independent of pores (unlike most other species); pores very few and widely separated in cephalis, apparently wholly lacking in thorax except for one row of about 16 circular ones at lower end where they more or less mark its lower bounds, in abdomen pores in 9 regular transverse rows (about 16 in a row), of elliptical outline (the long axes subvertical), mostly of similar size, in addition a few odd scattered pores out of regular lines on interspaces of abdomen, pores shallow and well separated.
Remarks on original description: The authors here list Tricolocampe altamontensis under the subgeneric name Tricolocamptra and include the subgeneric name in the species name.[comment from RadWorld database]

Description

Biogeography and Palaeobiology

Similar species
altamontensis

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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Siphocampe

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

Siphocampe altamontensis compiled by the radiolaria@mikrotax project team viewed: 29-11-2023

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