Catapsydrax globiformis


Classification: pf_cenozoic -> Globigerinidae -> Catapsydrax -> Catapsydrax globiformis
Sister taxa: C. indianus, C. dissimilis, C. globiformis, C. africanus, C. howei, C. unicavus, C. sp.,

Taxonomy

Citation: Catapsydrax globiformis (Blow and Banner 1962)
Rank: Species
Basionym: Globigerinita globiformis Blow and Banner 1962
Synonyms:
Taxonomic discussion: This species is slightly smaller than C. africanus and has apparently been overlooked by most previous workers. Its thickened test suggests that it may have dwelled deeper in the water column than C. africanus. We illustrate the holotype in SEM for the first time (Pl.5.2, Figs. 1-4). [Olsson et al. 2006]

Catalog entries: Globigerinita globiformis

Type images:

Distinguishing features: Nearly spherical test with thickened walls; bulla large but low, with 3-4 small, semicircular, infralaminal apertures.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters: Catapsydrax globiformis is distinguished from C. africanus by its nearly spherical test with thickened walls, less inflated bulla, and smaller infralaminal apertures. Catapsydrax howei is larger and has large circular, infralaminal apertures around its strongly inflated bulla. [Olsson et al. 2006]

Wall type: Cancellate, probably spinose, ruber/sacculifer-type wall texture. [Olsson et al. 2006]

Test morphology: Low trochospiral, nearly spherical test with 3-4 chambers in the final whorl. Chambers inflated, globular, increasing rapidly in size with a large bulla that covers the umbilicus and half of the surrounding chambers, walls thickened by gametogenetic calcification; in spiral view 3½ -4 globular, embracing chambers increasing rapidly in size, sutures straight, slightly depressed; in umbilical view dominated by a large, low bulla with 3-4 small, semicircular, infralaminal apertures with a continuous, thickened imperforate rim opening onto each suture which is straight and slightly depressed; in edge view nearly circular in shape with large, slightly inflated bulla showing one small aperture opening onto the suture line. [Olsson et al. 2006]

Size: Holotype maximum diameter 0.23 mm, thickness 0.20 mm. [Olsson et al. 2006]

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Bulla
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Infralaminal
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Known from tropical to mid latitude sites. [Olsson et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (2006c)

Isotope paleobiology: No data available. [Olsson et al. 2006]
Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light δ13C and very heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Keller (1985)

Phylogenetic relations: Catapsydrax globiformis probably evolved from C. unicavus in the late Eocene by developing a more spherical test with a large low-lying, slightly inflated bulla with multiple infralaminal apertures opening onto the suture lines. [Olsson et al. 2006]

Most likely ancestor: Catapsydrax unicavus - at confidence level 4 (out of 5). Data source: Olsson et al. 2006 f5.1.

Biostratigraphic distribution

Geological Range:
Notes: Zone E12 to E15. [Olsson et al. 2006]
Last occurrence (top): within E15 zone (34.68-35.89Ma, top in Priabonian stage). Data source: Olsson et al. 2006 f5.1
First occurrence (base): within E12 zone (39.97-40.40Ma, base in Bartonian stage). Data source: Olsson et al. 2006 f5.1

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Eocene Atlas, chap. 5, p. 71

References:

Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E. , Banner, F. T. , Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gs

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 5): 67-110. gs

Warraich, M. Y. & Ogasawara, K. (2001). Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan. Science Reports of the Institute of Geosciences, University of Tsukuba, Section B = Geological Sciences. 22: 1-59. gs


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Catapsydrax globiformis compiled by the pforams@mikrotax project team viewed: 16-9-2019

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