radiolaria - rads_cenozoic - Phormostichoartus caryoforma radiolaria - rads_cenozoic - Phormostichoartus caryoforma

Phormostichoartus caryoforma


Classification: rads_cenozoic -> Artostrobiidae -> Phormostichoartus -> Phormostichoartus caryoforma
Sister taxa: P. caryoforma, P. corbula, P. crustula, P. doliolum, P. fistula, P. furcaspiculata, P. marylandicus, P. multiseriatus, P. pitomorphus, P. platycephala, P. schneideri, P. strongi, P. sp.

Taxonomy

Citation: Phormostichoartus caryoforma (Caulet) Nigrini&Caulet 1992
Taxonomic rank: species
Basionym: Lithamphora caryoforma
Synonyms:
1979 Lithamphora caryoforma - Caulet p. 131, pl.2, fig.2.

From Suzuki Paleotax db:

1979 Lithamphora caryoforma n. sp. Caulet p. 131, pl. 2, fig. 2
1992 Phormostichoartus caryoforma (Caulet) Nigrini & Caulet p. 161, pl. 6, figs. 7-9
1996 Phormostichoartus caryoforma (Caulet) Haslett pl. 2, fig. 15
Taxonomic discussion: (Caulet) 1979

Catalog entries: Lithamphora caryoforma

Original description: Petite Lithamphora à trois segments. Céphalis et thorax soudés avec tube vertical incliné sur le thorax. Abdomen rétréci en tube très court avant l'ouverture. Cette espèce se distingue de la précédente, dont elle est peut-être l'ancêtre, par une suture lombaire plus nette et une ouverture non rétrécie.
[Small Lithamphora with three segments. Cephalis and thorax united with the vertical tube inclined on thorax. Abdomen narrowing into a very short tube before opening. This secies is distinguished from the former (L. crustula) whose it may be the ancestor, by lombar stricture more marked and a not narrowed opening.]

Description


Published descriptions


Nigrini and Caulet 1992 Lithamphora caryoforma

Plate 6, figures 7-9

Description: Shell three-segmented, smooth,generally cylindrical, but tapering distally. Cephalis approximately spherical, but not easily distinguished from the thorax. Vertical tube cylindrical, lying along the proximal part of the thorax. Thorax annular with 3 to 4 horizontal rows of subcircular pores, 4 pores on a half equator. Lumbar stricture distinct. Abdomen vase-shaped, i.e. cylindrical, but tapering distally, with horizontal rows of subcircular pores of varying size. No peristome. Dimensions (based on 25 specimens): Length of cephalis 10-14 m; of thorax 24-26 µm; of abdomen 53-63 µm. Maximum breath of cephalis 26-28 µm; of thorax 35-40 µm, of abdomen 45-50 µm. Distinguishing characters: This species is distinguished from P. schneideri by its smooth abdominal outline and smaller size.


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:

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. & Caulet, J. (1992). Late Neogene radiolarian assemblages characteristic of Indo-Pacific areas of upwelling. Micropaleontology. 38(2): 139-164. gs


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Phormostichoartus caryoforma compiled by the radiolaria@mikrotax project team viewed: 7-2-2025

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