CATALOG OF ORIGINAL DESCRIPTIONS: Prosphaeroidinella Ujiie 1976

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> P -> Prosphaeroidinella
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Daughter taxa: (blue => in age window 0-300Ma)
status uncertain
status uncertain
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status uncertain

Prosphaeroidinella

Citation: Prosphaeroidinella Ujiie 1976
Rank: Genus
Type species: Sphaeroidinella disjuncta Finlay

Current identification/main database link: Sphaeroidinellopsis Banner & Blow, 1959


Original Description
In the type species, Sphaeroidinella disjuncta Finlay, honey-comb wall structure becomes considerably obscure at the earlier portion of specimen because of remarkable piling-up of lamellae during the course of growth. Since this type of wall-thickening is accomplished by the outward growth of respective calcite crystals disposed radially against test-surface, the present secondary process does not produce directly such a smooth test-surface as seen in Sphaeroidinella or Sphaeroidinellopsis but still maintains the rough surface. Moreover, S. disjuncta is provided with somewhat more broadly opened aperture than in Sphaeroidinellopsis.

Another species also belonging to Prosphaeroidinella, P. parkerae Ujiie, shows much more widely spaced framework of honey-comb structure. The frame is distinctly larger than that of normal species of Globigerinoides and solely comparable sized frame can be recognized at the outer face of an inner layer (designated as Layer 2 in tf. I) of wall in Sphaeroidinellopsis or Sphaeroidinella. The outer layer (Layer 3) is so-called cortex layer, whose outer surface is quite smooth paved by the calcite basal planes. The smoothness corresponds to that at the inner surface of wall. These facts imply some essential difference in genesis between the two types of layer. As will be discussed and inferred in Remarks on the species, the inner layer may be a fundamental constituent of wall in Sphaeroidinellopsis or Sphaeroidinella, while the outer cortex layer may be secondary but advanced component characteristic to the genera. Therefore, I suppose that the wall structure peculiar to P. parkerae Ujiie may not have been resulted from such a peeling-out of outer Layer 2 of Sphaeroidinellopsis or Sphaeroidinella through certain chemical dissolution or physical process (e. g., some vibration effect during the maceration of sediment samples) as Parker (1967) thought previously, but it may represent a kind of atavism. In this respect, the species must belong to the genus Prosphaeroidinella, although there is necessity to consider the phylogenetic difference between P. parkerae Ujiie and P. disjuncta (Finlay).

The present supposition from taxonomic views of the two species seems to be substantiated by their stratigraphic occurrences. Last appearance of P. disjuncta is followed immediately by the initial appearance of rather primitive but real Sphaeroidinellopsis species at the boundary between the N. 12 and N. 13 of Blow's (1969) zones, whereas P. parkerae Ujiie occurs concurrently with well-developed Sphaeroidinellopsis and with Pliocene species of Sphaeroidinella.

Extra details from original publication
The following species were included in Prosphaeroidinella by Ujiie in 1976:

References:

Ujiie, H., (1976). Prosphaeroidinella, n. gen.: Probable ancestral taxon of Sphaeroidinellopsis (Foraminifera),. Bulletin of the National Science Museum, Series C, 2(1): 9-26.


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Prosphaeroidinella compiled by the pforams@mikrotax project team viewed: 22-9-2018

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