Catapsydrax howei


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

Taxonomy

Citation: Catapsydrax howei Blow and Banner 1962
Rank: Species
Basionym: Globigerinita howei
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: Catapsydrax golicynensis;
Globigerinita howei;

Type images:

Short diagnosis: 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.

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


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 in life, ruber/sacculifer-type wall texture. [Olsson et al. 2006]

Test morphology: Low trochospiral, lobulate test with generally 3 chambers, somewhat loosely coiled, in the final whorl. Chambers inflated, globular increasing rapidly in size with a large globular, inflated bulla covering the umbilicus; in spiral view 3 globular chambers increasing rapidly in size, sutures straight to slightly curved, moderated depressed; in umbilical view dominated by a large inflated bulla with 3 large circular, infralaminal apertures with a continuous, thickened imperforate rim facing each suture; sutures straight, somewhat strongly depressed; in edge view globular in shape with bulla showing one infralaminal aperture opening onto the suture line. [Olsson et al. 2006]

Size: Holotype maximum diameter 0.54 mm, thickness 0.53 mm. [Olsson et al. 2006]

Character matrix

test outline:Lobatecoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Wide
edge view:Equally biconvexumbilical or test sutures:Strongly depressedspiral sutures:Strongly depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Cancellateaperture:Interiomarginalaperture border:Thick lipaccessory apertures:Infralaminal
periphery:N/Aumb chamber shape:Globularsp chbr shape:Globularperiph margin shape:Broadly rounded
umb depth:Deepdiameter mm:0.54width mm:breadth mm:0.53
final-whorl chambers:3.0-3.0

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]

Biostratigraphic distribution

Geological Range:
Notes: Zone E12 to E15. [Olsson et al. 2006]
Last occurrence (top): within E16 zone (33.90-34.68Ma, top in Priabonian stage). Data source: Eocene Atlas
First occurrence (base): within E9 zone (43.23-43.85Ma, base in Lutetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 5, p. 72

References:

Blow, W.H. & Banner, F.T., (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In: Eames, F.E. et al. (Editors), Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge, pp. 61-151.

Menkes, M.A., (1975). Representatives of the genus Catapsydrax in the Eocene deposits of the South Ukraine. Akad Nauk SSSR, Sib Otd, Inst Geol Geofiz, Trudy, 333: 281.

Olsson, R.K.; Pearson, P.N. & Huber, B.T., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. 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. 67-110.

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.


Catapsydrax howei compiled by the pforams@mikrotax project team viewed: 23-5-2017

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