Catapsydrax dissimilis


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

Taxonomy

Citation: Catapsydrax dissimilis Cushman & Bermudez 1937
Rank: Species
Basionym: Globigerina dissimilis
Synonyms: N.B. This is a commonly recognized species in the Oligocene and lower Miocene; here we present an abbreviated synonymy list.
Taxonomic discussion: Blow and Banner (1962) originally placed C. africanus in Globigerinita but this genus is a microperforate taxon, hence it is here placed in Catapsydrax. The species name is changed to agree in gender with the genus Catapsydrax (ICZN, Art. 31.2). Catapsydrax africanus, has a low, slightly inflated bulla covering the umbilicus with a single low arched aperture. The infralaminal aperture is bordered by a continuous narrow lip that becomes thickened with gametogenetic calcification. The wall texture of the ruber/sacculifer-type also becomes thickened by gametogenetic calcification. The wall texture of C. africanus is the same as in C. unicavus, and the infralaminal apertures are bordered by a continuous, narrow, thickened lip. In C. africanus the bulla is more inflated and the infralaminal apertures are larger. Blow (1979) regarded africanus as a subspecies of Catapsydrax echinatus Bolli, but that species is regarded as an aberrant acarininid in this work (see Berggren and others, Chapter 9, this volume). Catapsydrax africanus is a small form and has apparently been overlooked by many previous workers. We illustrate the holotype in SEM for the first time (Pl.5.1, Figs. 1-3) as well as newly collected specimens from the type locality (Pl.5.1, Figs. 4-7). [Olsson et al. 2006]

Catalog entries: Globigerina dissimilis;
Globigerina simulans;

Type images:

Short diagnosis: Catapsydrax africanus is distinguished from C. globiformis by its less
spherical test and by having a more inflated bulla that has larger, more open, infralaminal apertures. Catapsydrax howei is larger and has a larger, still more inflated bulla with large circular, infralaminal apertures.

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 africanus is distinguished from C. globiformis by its less
spherical test and by having a more inflated bulla that has larger, more open, infralaminal apertures. Catapsydrax howei is larger and has a larger, still more inflated bulla with large circular, infralaminal apertures. [Olsson et al. 2006]

Wall type: Coarsely cancellate, probably spinose in life, with tendency to develop a thick crust in some species. [Olsson et al. 2006]

Test morphology: Globular, lobulate, typically with 4 chambers in the final whorl. Chambers moderately inflated, appressed, with an umbilical bulla with one or more infralaminal apertures in the adult stage. The apertures are bordered by a continuous, narrow lip that may be thickened by gametogenetic calcification. [Olsson et al. 2006]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
umb chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
sp chbr shape:Globularumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:Infralaminal
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5
spiral sutures:Moderately depresseddiameter mm:width mm:breadth mm:
final-whorl chambers:4.0-4.0

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 Kennett & Srinivasan (1983)

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); Pearson et al. (1997b); Wade et al. (2007); Pearson & Wade (2009).

Phylogenetic relations: Catapsydrax africanus probably evolved from C. howei in the late middle Eocene by developing a less inflated bulla with smaller infralaminal apertures opening onto the sutures. [Olsson et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: Zone E13 (middle part; Abdel-Kireem, 1983) to Zone E15 (Blow and Banner, 1962). [Olsson et al. 2006]
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in stage). Data source:

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 5, p. 71

References:

Bermudez, P.J., (1937). Nuevas especies de Foraminiferos del Eoceno de las cercanias de Guanajay, provincia Pinar del Rio, Cuba. Memorias de la Sociedad Cubana de Historia Natural, 11(4): 237-248.

Bermudez, P.J., (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Mem. III Congreso Geol. Venez. Editorial Sucre, Caracas, 1119-1393 pp.

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.

Cushman, J.A. & Bermudez, P.J., (1937). Futher new species of foraminifera from the Eocene of Cuba. Contributions From the Cushman Foundation for Foraminiferal Reseach, 13(1): 1-29.

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

Huber, B.T., (1991). Paleogene and early Neogene planktonic foraminifer biostratigraphy of ODP Leg 119 Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results, 119: 427-449.

Kennett & Srivinasan 1983 [sorry, not in our bibliography yet]

Loeblich, A.R., Jr. & Tappan, H., (1957). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 173-198.

Loeblich, A.R. & Tappan, H., (1957). Woodringina, a new foraminiferal genus (Heterohelicidae) from the Paleocene of Alabama. Journal of the Washington Academy of Sciences., 47: 39-40.

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.

Premoli Silva 1991 [sorry, not in our bibliography yet]

Spezzaferri, S., (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica, 81: 1-187.


logo

Catapsydrax dissimilis compiled by the pforams@mikrotax project team viewed: 18-8-2017

Taxon Search:
Advanced Search
AphiaID: 735159 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics