Catalog - Streptochilus dubeyi

CATALOG OF ORIGINAL DESCRIPTIONS: Streptochilus dubeyi Petters 1983

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: pf_cat -> S -> Streptochilus -> Streptochilus dubeyi
Other pages this level: S. cetacensis, S. dubeyi, S. globiger infirmirugosus, S. inglei, S. latum, S. macdougallae, S. mascarenensis, S. pristinum, S. rockallkiddensis, S. subglobigerum, S. tasmanensis, S. tokelauae flexiserialis

Streptochilus dubeyi

Citation: Streptochilus dubeyi Petters 1983
Rank: Species
Type specimens: Holotype: U.S.N.M. 328702; paratype: U.S.N.M. 328703.
Type age (chronostrat): Late early Miocene Praeorbulina glomerosa Zone.
Type locality: Nigeria; Etelebou-l well (2,080-2,097 m).
Type repository: USNM

Linked specimens: USNM-328702 USNM-328703

Current identification:

Original Description

Test small, biserial, narrow, gradually flaring, mod­ erately compressed, and sometimes slightly twisted. Periphery nar­ row; mildly lobulate outline. Seven to eight interlocking pairs of chambers, initial chambers indistinct and strongly compressed but later chambers are slightly inflated. Sutures horizontal, narrow, and incised. Aperture narrow and high arch, bordered by an inward twisted collar. Wall densely perforate.

Length of holotype 0.23 mm, maximum width 0.11 mm.

After Dr. Roger Dubey, Shell Oil Co. micropaleontologist who died while serving in Nigeria.

Extra details from original publication
Remarks. Streptochilus dubeyi falls within the morphological and stratigraphical range of the genus Streptochilus (Bronnimann and Resig, 1971). Bronnimann and Resig distinguished Streptochilus from Chiloguembelina on the basis of the apertural collar which occurs in both forms, but is inflected inward in Streptochilus. Unlike Boli­vina, Streptochilus has a collar which emerges from the margin of the aperture, an arrangement that is morphologically distinct from the tooth plate of Bolivina. Streptochilus dubeyi is morphologically similar to the lower-middle Miocene form S. pristinum Bronnimann and Resig in its small, slender, very gradually flaring, smooth­ walled test with slightly lobulate outline and indistinct initial cham­ bers. However, S. dubeyi is less compressed than S. pristinum, and has more globular chambers, more depressed sutures, and a wider aperture. Some specimens of S. dubeyi are slightly twisted or show strongly depressed sutures.

Editors' Notes


Petters, S. W. (1983). Gulf of Guinea planktonic foraminiferal biochronology and geological history of the South Atlantic. Journal of Foraminiferal Research. 13(1): 32-59. gs


Streptochilus dubeyi compiled by the pforams@mikrotax project team viewed: 30-11-2022

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