Taxonomy
Original description: Shape of test planispiral, stellate, biumbilicate, evolute. Wall calcareous, finely perforate. Chambers spherical in early stage, in last whorl becoming more and more elongate and pointed at the outer end; 12-15 chambers arranged in 2.5 whorls. The 5-6 chambers of the last whorl increase fairly rapidly in size. The position of the last chamber is often slightly oblique. Sutures radial, depressed. Aperture a long, low slit, bordered by a rim or lip; equatorial. Relict apertures of earlier chambers of last whorl present but often not clearly visible in examined material.
Entries in the Catalog of original descriptions: Planomalina saundersi, Hastigerinoides cepedai
Character matrix
| test outline: | Stellate | chamber arrangement: | Planispiral | edge view: | aperture: | Equatorial | |
| sp chamber shape: | Elongate | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Elongate | umbilicus: | Wide | periph margin shape: | Narrowly rounded | accessory apertures: | Relict |
| spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Finely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 5-6 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geological Range:
Last occurrence (top): within T. rohri (-Ma, top in "Holocene" stage). Data source: copied from Chronos database, but zonal name updated from T. bejaouaensis to T. rohri
First occurrence (base): within G. algerianus zone (116.86-118.24Ma, base in Aptian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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Pseudoschackoina saundersi compiled by the pforams@mikrotax project team viewed: 18-1-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110466 Go to Archive.is to create a permanent copy of this page - citation notes |
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