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Chiloguembelina parallela Beckmann 1957 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513
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Anonymous: Unedited TaxonConcept data
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Species Chiloguembelina parallela Beckmann 1957


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Microperforate, finely pustulose, lacking pore mounds or striae. Test morphology: Test short, rapidly tapering, periphery rounded rather than compressed; chambers biserial, increasing moderately in size, globular, sutures moderately depressed, slightly oblique toward apical axis; aperture a high, narrow, and symmetrical arch bordered by two parallel lateral flanges, occasionally covered by irregularly shaped terminal chamber. Size: Holotype (USNM 5780) length 0.12 mm, width 0. l l mm, breadth 0.07 mm.
Discussion / Comments:
Pearson et al. (2006):
DISTINGUISHING FEATURES.- Differs from other chiloguembelinids by its short, thick test that tapers rapidly toward its base and its centrally located, symmetrical, high and narrow aperture. DISCUSSION.- The holotype of C. parallela (Pl. 16.3, Figs. 11-12) shows the rapidly tapering test and centered, highly arched aperture that are characteristic of this species. Despite these distinctive features this species has not been reported outside of Trinidad, perhaps because it has been overlooked. PHYLOGENETTC RELATIONSHIPS.- According to Beckmann (1957), C. parallela probably descended from Chiloguembelina crinita during the early Eocene. STRATIGRAPHIC RANGE.- Lower Eocene Zone E3 to middle Zone E4. Beckmann (1957) suggested that C. parallela is a good index marker for the lower Eocene as it has a short range within the Globorotalia rex Zone in the upper Lizard Springs Fm. of Trinidad. GEOGRAPHIC DISTRIBUTION.- This species has not been reported outside of Trinidad. STABLE ISOTOPE PALEOBIOLOGY- No data are available.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Chiloguembelinidae
    Genus Streptochilus
Synonym list:
Pearson et al. (2006):
1957 Chiloguembelina parallela Beckmann. - Beckmann : p.91 pl. 21; fig. 8; text-fig. 15(36-38) [lower Eocene, upper Lizard Springs Fm., Cascas River bank, southern Trinidad]
2006 Chiloguembelina parallela Beckmann. - Pearson et al. : p.480 pl. 16.3; fig. 11-12 (Pl. 16.3, Figs. 11, 12: new SEMs of holotype of Chiloguembelina parallela Beckmann)
Specimen:
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 5780
References:

Beckmann,J.P. (1957):
Chiloguembelina Loeblich and Tappan and Related Foraminifera from the Lower Tertiary.
In: Studies in Foraminifera, United States National Museum Bulletin Vol. 215 Eds: Loeblich, A.R.et al. p. 83-95

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
Anonymous: Unedited TaxonConcept data
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This work is licensed under a Creative Commons Attribution 2.5 License.