CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinatheka lindiensis Blow & Banner 1962

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 -> G -> Globigerinatheka -> Globigerinatheka lindiensis
Other pages this level: G. barri, G. curryi, G. euganea, G. kutchensis, G. lindiensis, G. subconglobata luterbacheri,

Globigerinatheka lindiensis

Citation: Globigerinatheka lindiensis Blow & Banner 1962
Rank: Species
Type locality: Lindi area.
Type age: Globigerapsis semi-involuta Zone, Upper Eocene
Type sample and level: sample FCRM 1645
Type & figured specimens: Plate XV O-P

Linked specimens: London, UK; NHM (PM P 44561)

Current identification/main database link: Globigerinatheka tropicalis (Blow & Banner 1962)


Original Description
The moderately large test consists of about three whorls of fairly rapidly enlarging, inflated, partially embracing chambers, arranged four in each whorl in a low trochospire. The equatorial profile of the test (excluding the bullae) is subcircular to subquadrate, and the equatorial periphery is broadly and weakly lobulate. In axial profile, the test is subcircular and the periphery is broadly rounded. At the end of the second whorl the chambers rapidly increase in their rate of enlargement, becoming increasingly inflated and embracing ventrally, so that the last formed primary chamber envelops the whole of the ventral surfaceof the earlier test. In dorsal view the chambers are initially semicircular to reinform in outline, but they become increasingly depressed and longer than broad during the last whorl. The dorsal sutures are initially indistinct, but, by the second whorl, they become distinctly but broadly and weakly depressed; the dorsal intercameral sutures are subradial or slightly curved, meeting the weakly lobulate spiral suture almost at right angles. The initially subglobular primary chambers become, in axial view, increasingly ovoid in the last whorl; they are weakly inflated dorsally but very strongly inflated ventrally, and there is no distinct dorso-peripheral shoulder. In the adult, about three highly arched aperturesare present in the suture between the last chamber and the ventral surface of the earlier test. These multipleapertures are each covered by small, strongly inflated, subglobular bullae, wich are attached along part or whole of their breadth to the surface of the last primary chamber. Each bulla may possess a single accessory aperture, which may be almost as highly and broadly arched as the primary aperture beneath it; alternatively, the bulla may arch over from the last primary chamber, to unite with the ventral surface of the adjacent earlier primary chamber , to restrict or divide the accessory aperture into two or more smaller accessory openings. The accessory apertures are typically furnished with narrow lips or rim-like thickenings. The wall of the primary chambers is fairly thick, and it is uniformly and finely perforate; its surface may be densely and very finely hispid. The walls of the bullae are similar to the wall of the primary chambers, but are distinctly thinner; the surface of the bullae is comparable to that of the primary chambers. 

Size: Maximum diameter of holotype: 0.37 mm.

References:

Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E. , Banner, F. T. , Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs


logo

Globigerinatheka lindiensis compiled by the pforams@mikrotax project team viewed: 31-3-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=130754 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics