CATALOG OF ORIGINAL DESCRIPTIONS: Turborotalia pseudoampliapertura sinaiensis Haggag and Luterbacher 1995

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 -> T -> Turborotalia -> Turborotalia pseudoampliapertura sinaiensis
Other pages this level: T. altispiroides, T. bannerblowi, T. bykovae, T. cambayensis, T. centralis perfecta, T. clemenciae, T. czeczvaensis, T. hirsutoides, T. kotarduensis, T. lata, T. munda franzenaui, T. pseudoampliapertura nukhulensis, T. pseudoampliapertura sinaiensis, T. pseudobesa, T. vagalkhodensis

Turborotalia pseudoampliapertura sinaiensis

Citation: Turborotalia pseudoampliapertura sinaiensis Haggag and Luterbacher 1995
Rank: sub-species
Type locality: Wadi Nukhul section near Abu Zenima, western central Sinai, Egypt.
Type age (chronostrat): Middle Eocene, upper part of Truncorotaloides rohri Zone.
Type sample (& lithostrat): Sample n° 58, Khaboba Fm
Type specimens: P1. 3, fig. 1-4; Desc p41-42
Type repository: Basel; NHM

Current identification/main database link: Turborotalia ampliapertura Bolli 1957


Original Description
Test generally small, nonumbilicate, biconvex; umbihcal side more strongly convex than spiral one ; equatorial periphery lobate, in axial view periphery rounded with distinct dorso-peripheral shoulder. Three tightly coiled whorls with approximately 13 chambers; 3½ to 4 chambers of the last whorl increasing rapidly in size as added. Sutures deeply incised, radial on umbilical side, slightly curved on spiral side. Aperture a high arch with distinct lip. Surface coarsely perforate.

Size: Diameter : 125-235 µm

Etymology: The subspecies is named after its type-area.

Extra details from original publication
Remarks: The specimens illustrated by Haggag (1990, pl. 1, fig. 25, 27) as Globigerina cf. ampliapertura belong to T. pseudoampliapertura sinaiensis. Slightly variable characters in this subspecies are the height of the spiral side, the width of the last chamber, the shape of the dorso-peripheral shoulder, and the shape of the apertural arch which varies from symmetrical to slightly asymmetrical. The new subspecies differs from T. pseudoampliapertura pseudoampliapertura in having a smaller, more delicate nonumbilicate test, more strongly depressed sutures and a more coarsely perforate surface. T. pseudoampliapertura sinaiensis n. subsp, has been compared with topotypes of Globigerina ampliapertura BOLLI, 1957 kindly provided by its author. It differs from this species in having a more distinct dorso-peripheral shoulder, more laterally compressed chambers in the last whorl and a more finely perforated surface. The early ontogenetic portion of the tests indicates different ancestors (see also Blow and Banner, 1962 ; Blow, 1979).

References:

Haggag, M. A. & Luterbacher, H. (1995). The Turborotalia pseudoampliapertura lineage in the Eocene of the Wadi Nukhul section, Sinai, Egypt. Revue de Micropaléontologie. 38: 37-47. gs


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Turborotalia pseudoampliapertura sinaiensis compiled by the pforams@mikrotax project team viewed: 8-3-2021

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