pforams@mikrotax - Chiloguembelina crinita

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pforams@mikrotax - Chiloguembelina crinita pforams@mikrotax - Chiloguembelina crinita

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.

Eocene_Atlas_pl16-1_fig16.jpg
Eocene_Atlas_pl16-1_fig17.jpg
Olsson_etal_99_pl69_f05-7.jpg
Olsson_etal_99_pl69_f01-4.jpg

Taxonomy

Citation: Chiloguembelina crinita (Glaessner 1937)

Taxonomic rank: species

Basionym: Guembelina crinita

Synonyms:

Chiloguembelina crinita (Glaessner). Beckmann, 1957:89, pl. 21: fig. 4; text-figs. 14, 1-4 [upper Paleocene G. pseudomenardii and G. velascoensis zones (Zones P4 and P5), lower Lizard Springs Fm., Trinidad]. Loeblich and Tappan, 1957:178, pl. 49: fig. 1: pl. 51: figs. 1a-3, pl. 56: figs. 1a-b, pl. 60: fig. 6, pl. 62: fig. 1 [upper Paleocene, Vincentown Fm., New Jersey, Nanafalia Fm., Alabama, Aquia Fm., Maryland, Hornerstown Fm., New Jersey, U.S.A., Velasco Fm., Mexico]. Olsson and others, 1999:90, pl. 69: figs. 1-8 [upper Paleocene Zone P4, Glendola Well, New Jersey].
?Chiloguembelina midwayensis subcylindrica Beckmann, 1957:92, pl. 21: figs. 2, 3; text-fig. 14 [Globorotalia rex and Globorotalia formosa Zones, Lizard Springs Fm., Trinidad].
Guembelina crinita Glaessner, 1937:383, pl. 4: fig. 34a, b [Paleocene, Erdöveld, Ilskaja, northwest Caucasus, Russia].

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:

holotype: G. crinita

Distinguishing features:
Parent taxon (Chiloguembelina): Test subtriangular in outline, biserial throughout or rarely with multiserial final chambers; aperture a simple arched opening at base of the final chamber, with a narrow rim on one margin and a broad collar or flange directed toward one of the flat sides of the test, lacking an infolded margin or internal plate. Rarely with multiple apertures.
This taxon: 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: Triangular chamber arrangement: Biserial edge view: Equally biconvex aperture: Interiomarginal
sp chamber shape: Globular coiling axis: N/A periphery: N/A aperture border: Thin lip
umb chbr shape: Globular umbilicus: N/A periph margin shape: Broadly rounded accessory apertures: None
spiral sutures: Moderately depressed umb depth: N/A wall texture: Moderately pustulose shell porosity: Microperforate: <1µm
umbilical or test sutures: Strongly depressed final-whorl chambers: 2-2 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; plot with descendants

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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Chiloguembelina crinita, synonyms included - Chiloguembelina criniata; Chiloguembelina crinita;
See also space-time plot :: Samples map :: Parent: Chiloguembelina

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 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 O

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. (85): 1-252. gs

Chiloguembelina crinita compiled by the pforams@mikrotax project team viewed: 24-3-2025

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test outline:	Triangular	chamber arrangement:	Biserial	edge view:	Equally biconvex	aperture:	Interiomarginal
sp chamber shape:	Globular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	N/A	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	N/A	wall texture:	Moderately pustulose	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	2-2	N.B. These characters are used for advanced search. N/A - not applicable