Chiloguembelina crinita


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

Distinguishing features: Test biserial throughout; aperture is marked by a narrow lip, infolded on one side, and expanded into a distinct apertural flange on the opposite side. Later chambers are subglobular. The sutures distinct and depressed. Test microperforate and last chambers finely hispid.

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: 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:Equally biconvexaperture:Interiomarginal
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Moderately pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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

Most likely ancestor: Chiloguembelina midwayensis - at confidence level 4 (out of 5). Data source: Olsson et al. 1999, f6.
Likely descendants: Chiloguembelina ototara; Chiloguembelina wilcoxensis; Streptochilus martini;

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. [Huber et al. 2006]
Last occurrence (top): within E9 zone (43.23-43.85Ma, top in Lutetian stage). Data source: Huber et al. 2006
First occurrence (base): within P4a subzone (60.52-60.73Ma, 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. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 83-95. gs

Glaessner, M. F. (1937b). 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. gs

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. , 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 16): 461-508. gs

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 173-198. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs


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Chiloguembelina crinita compiled by the pforams@mikrotax project team viewed: 15-12-2019

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