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 test comprised of biserially arranged chambers, 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. Many Chiloguembelina species with well-developed flap or flange bordering aperture along infolded side.

Original description of foraminiferal tests assignable to subfamily Guembelitriinae does not apply to all members of family Guembelitriidae. Tests of guembelitriid foraminifera either triserial (Guembelitria spp.), trochospiral (Parvularugoglobigerina spp., Globoconusa spp.), or nearly triserial in initial whorl and approximately biserial in later whorls (Woodringina spp.). 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; when present, pustules or small mounds generally perforated by one or more pores ("pore-mounds") (Guembelitria, Parvularugoglobigerina, Woodringina) or peripherally associated with pores (Globoconusa).

Test with biserial arrangement of alternating chambers, final arrangement either 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): within Messinian Stage (5.33-7.25Ma, top in Messinian stage). Data source: Total of range of species in this database
First occurrence (base): within Maastrichtian Stage (66.04-72.05Ma, base in Maastrichtian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


microperforate compiled by the pforams@mikrotax project team viewed: 26-6-2017

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