microperforate


Classification: pf_cenozoic -> microperforate
Sister taxa: microperforate, muricate non-spinose, smooth non-spinose, spinose, hidden,
Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa


Small biserial test, often with a slightly twisted coiling axis. Intercameral sutures distinct, depressed, and often somewhat oblique. Wall calcareous and microperforate with smooth to pustulous surface texture. Aperture arched, rimmed by narrow lip, and generally infolded on one side of ultimate chamber.

Tests triserial (Guembelitria), trochospiral (Parvularugoglobigerina, Globoconusa), or nearly triserial in initial whorl becoming biserial (Woodringina). Chambers usually globular or subglobular, increasing gradually in size. Aperture usually a loop-shaped arch, often slightly infolded on one side, marked by a fine lip. Surface texture microperforate, smooth to pustulous.

Test biserial, may become multiple or uniserial; chambers, globular to ovoid in shape; wall smooth or striated with fine to coarse parallel ridges; aperture, a low, symmetrical arch, usually at base of ultimate chamber, may be terminal, may have accessory sutural apertures.



Taxonomy

Citation: microperforate
Rank: informal group

Catalog entries:

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in upper part of Messinian Stage (58% up, 6.1Ma, in Messinian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Maastrichtian Stage (36% up, 69.9Ma, in Maastrichtian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


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microperforate compiled by the pforams@mikrotax project team viewed: 13-12-2017

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