Cassigerinelloita


Classification: pf_cenozoic -> microperforate -> Guembelitriidae -> Cassigerinelloita
Sister taxa: Cassigerinelloita, Globoconusa, Guembelitria, Jenkinsina, Parvularugoglobigerina, Woodringina,
Daughter taxa (blue => in age window 0-300Ma)
Characterized by small, subglobular test with a rotating triserial axis of coiling, indistinguishable umbilicus and often indistinguishable primary aperture.

Taxonomy

Citation: Cassigerinelloita Stolk, 1965, emended Li and Radford, 1992
Rank: Genus
Type species: Cassigerinelloita amekiensis Stolk, 1965
Taxonomic discussion: Cassigerinelloita was described by Stolk (1965) as belonging to the Cassigerinellidae, despite the fact that the chamber arrangement is not biserial. Loeblich and Tappan (1988) tentatively placed Cassigerinelloita in the Catapsydracidae because of a “microcancellate” wall and presence of bullae. Placement in the Family Guembelitriidae was suggested by Li and Radford (1992) based on the presence of a microperforate, pustulate wall, strongly inflated chambers, and the peculiar triserial coiling mode.
[Huber et al. 2006]

Catalog entries: Cassigerinelloita;

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


Wall type: Microperforate and pustulose; [Huber et al. 2006]

Test morphology: test small (~0.07-0.12 mm), globular, lacking a true umbilicus or distinct periphery; chambers added in a series of triserial, trochospiral coils that are offset following a change or reversal in chamber growth direction that occurs twice to three times during ontogeny; aperture a low, interiomarginal, often indistinct arch, with or without a thin bordering lip, situated on the suture separating the last two chambers and near the early chambers of the outer whorl; occasionally up to three nontriserial chambers formed terminally, each with sutural apertures.
[Huber et al. 2006]

Biogeography and Palaeobiology


Phylogenetic relations: Li and Radford (1992) suggested that Jenkinsina triseriata is directly ancestral to C. amekiensis based on similarity of wall texture and stratigraphic overlap of the two species.
[Huber et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: Upper lower – lower middle Eocene; lower Zone E7 - upper Zone E9 at low latitudes. First occurs at the base of Zone AE4 at high southern latitudes, which may be slightly earlier than at low latitudes, though the lower range in tropical-subtropical regions is not well documented.
[Huber et al. 2006]
Last occurrence (top): within Lutetian Stage (41.15-47.84Ma, top in Lutetian stage). Data source: Total of range of species in this database
First occurrence (base): within Ypresian Stage (47.84-55.96Ma, base in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Huber et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 16, p. 470

References:

Huber, B.T.; Olsson, R.K. & Pearson, P.N., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. Allen Press, Lawrence, Kansas, pp. 461-508.

Li, Q. & Radford, S.S., (1992). Morphology and affinity of the planktonic foraminifer Cassigerinelloita amekiensis Stolk and reclassification of Cassigerinelloita Stolk. In: Wise, S.W.J., Schlich, R. and al., e. (Editors), Proceedings of the Ocean Drilling Program, Scientific Results. Ocean Drilling Program, College Station, Texas, pp. 595-602.

Loeblich, A.R., Jr. & Tappan, H. (Editors), (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York, 1059 pp.

Stolk, J., (1965). Contibution à l'étude des corrélations microfaunique do Tertiaire inférieur de la Nigèrie méridionale. Bureau Recherches Géologiques Minerales Mémoire, 32: 247-267.


Cassigerinelloita compiled by the pforams@mikrotax project team viewed: 30-5-2017

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