Chiloguembelina crinita


Classification: pf_cenozoic -> microperforate -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina crinita
Sister taxa: C. crinita, C. cubensis, C. midwayensis, C. morsei, C. ototara, C. parallela, C. subtriangularis, C. trinitatensis, C. wilcoxensis, C. sp.,

Taxonomy

Citation: Chiloguembelina crinita (Glaessner 1937)
Rank: Species
Basionym: Guembelina crinita
Synonyms:
Taxonomic discussion: The later chambers of Chiloguembelina crinita specimens are much higher and more inflated than those of C. midwayensis and C. morsei. These differences are readily observable, as late-stage chambers of C. crinita appear subglobular in edge and plain views. [Olsson et al. 1999]

Catalog entries: Guembelina crinita;

Type images:

Short diagnosis: The test is biserial throughout and exhibits the characteristic chiloguembelinid apertural asymmetry; its aperture is marked by a narrow lip, infolded on one side, and expanded into a distinct apertural flange on the opposite side. As noted by Beckmann (1957) and Loeblich and Tappan (1957a), its later chambers are subglobular. The sutures are distinct and depressed. The test is microperforate and the last chambers are finely hispid.

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: The test is biserial throughout and exhibits the characteristic chiloguembelinid apertural asymmetry; its aperture is marked by a narrow lip, infolded on one side, and expanded into a distinct apertural flange on the opposite side. As noted by Beckmann (1957) and Loeblich and Tappan (1957a), its later chambers are subglobular. The sutures are distinct and depressed. The test is microperforate and the last chambers are finely hispid. [Olsson et al. 1999]

Character matrix

test outline:Triangularchamber arrangement:Biserialedge view:aperture:Terminal
umb chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:N/Aumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
umbilical or test sutures:Strongly depressedumb depth:N/Awall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:N/Adiameter mm:0.17 - 0.22width mm:0.10 - 0.15breadth mm:0.05 - 0.1
final-whorl chambers:10.0-15.0

Biogeography and Palaeobiology


Phylogenetic relations: Believed to have evolved from Chiloguembelina midwayensis (Beckmann, 1957). [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Upper Paleocene through middle Eocene (Zones P4-E9) based on study of samples from DSDP Site 390A on Blake Nose (Huber, pers. observ.). Specimens of C. crinita have been rarely reported from upper lower and lower middle Eocene sediments probably because of its small size and taxonomic confusion with other chiloguembelinid species.


Last occurrence (top): within E3 zone (54.61-55.20Ma, top in Ypresian stage). Data source: Olsson et al. 1999
First occurrence (base): within P4 zone (57.10-60.73Ma, base in Selandian stage). Data source: Olsson et al. 1999

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 90

References:

Beckmann, J.P., (1957). Chiloguembelina Loeblich and Tappan and related foraminifera from the Lower Tertiay of Trinidad, B.W.I. 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. 83-95.

Glaessner, M.F., (1937). Studien über foraminiferen aus der kreide und dem Tertiär des Kaukasus. I. Die foraminiferen der ältesten Tertiärschichten des Nordwest-Kaukasus. Problemy Paleontologii, Paleontologicheskay Laboratoriya Moskovskogo Gosudarstvennogo Universiteta, 2-3: 349-410.

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.; Hemleben, C.; Berggren, W.A. & Huber, B.T., (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Contributions to Paleobiology. Smithsonian Institution Press, Washington, DC, 1-252 pp.


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Chiloguembelina crinita compiled by the pforams@mikrotax project team viewed: 26-9-2017

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