holotype: V. austinana
holotype: V. austinana
Taxonomy
holotype: V. austinana
holotype: V. austinanaOriginal description: "Test with a large series of biserial chambers and but few expanded chambers in the adult, typically of but two rows, compressed; chambers globular in the later portion, uniformly increasing in size; sutures slightly depressed; wall smooth, punctate. Length 0.45 - 0.55 mm.; breadth 0.45 - 0.50 mm.; thickness 0.15 - 0.20 mm. "The species differs from V. eggeri in the fewer and larger adult chambers and smooth surface without costae."
Entries in the Catalog of original descriptions: Ventilabrella austinana
Character matrix
| test outline: | Subtriangular | chamber arrangement: | Multiserial | edge view: | Compressed | aperture: | Multiple |
| sp chamber shape: | Inflated | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
| umb chbr shape: | Inflated | umbilicus: | N/A | periph margin shape: | Moderately rounded | accessory apertures: | N/A |
| spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Finely costate | shell porosity: | |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.0-5.0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.91-92.56Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
References:
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Ventilabrella austinana compiled by the pforams@mikrotax project team viewed: 25-3-2023
Short stables page link: https://mikrotax.org/pforams/index.php?id=110567 Go to Archive.is to create a permanent copy of this page - citation notes |
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