pforams@mikrotax - Abathomphalus

pforams@mikrotax - Abathomphalus pforams@mikrotax - Abathomphalus

Abathomphalus

Classification: pf_mesozoic -> Globotruncanidae -> Abathomphalus
Sister taxa: Abathomphalus, Contusotruncana, Dicarinella, Gansserina, Globotruncana, Globotruncanella, Globotruncanita, Loeblichella, Marginotruncana, Radotruncana

Daughter taxa (time control age-window is: 0-800Ma)
			Abathomphalus intermedius
			Abathomphalus mayaroensis
			Abathomphalus sp. Specimens which cannot be assigned to established species

Taxonomy

Citation: Abathomphalus Bolli, Loeblich,&Tappan 1957

taxonomic rank: Genus

Type species: Globotruncana mayaroensis Bolli, 1951

Original description: Test free, trochospiral, biconvex to concavoconvex, almost nonumbilicate, periphery with a single or double keel; sutures depressed, curved and sometimes beaded on the spiral side, depressed and radial on the umbilical side; wall calcareous, perforate, radial in structure, commonly ornamented with fine nodes, and the peripheral keels and sutures may also be beaded; primary aperture interiomarginal, extraumbilical, as a rule covered by a continuous umbihcal tegillum of irregular outline, with accessory infralaminal apertures situated at the suture contacts with the tegillum.

Entries in the Catalog of original descriptions: Abathomphalus

Distinguishing features:
Parent taxon (Globotruncanidae): Test trochospiral, chambers angular, periphery truncate or carinate; primary aperture umbilical, covered by a spiral system of tegilla that is provided with accessory intralaminal and infralaminal apertures.
This taxon: Test in a low to flat trochospiral, umbilicate, four to five petaloid chambers per whorl, sutures curved and oblique, depressed to thickened and nodose on the spiral side, depressed and radial around the small umbilicus on the umbilical side, periphery angular to truncate, bicarinate, the two variously spaced keels bordering an imperforate carinal band, keel on the umbilical side may be reduced to a row of short transverse costellae; wall calcareous, perforate, surface with pustules and short costellae in concentric alignment on the spiral side and radial on the umbilical side; primary aperture in teriomarginal, extraumbilical-umbilical, and with a porticus, portici of successive chambers coalescing in the early stage, larger in the adult stage and joined only at a few points to form a tegilla having distal accessory apertures.

Geological Range:
Last occurrence (top): at top of P. hariaensis zone (100% up, 66.4Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian stage). Data source: Total of ranges of species in this database

Plot of range and 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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Globotruncanidae

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs

Abathomphalus compiled by the pforams@mikrotax project team viewed: 16-10-2024

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