Catalog - Ventilabrella

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.

Other pages this level: Vanhintella, Velapertina, Ventilabrella

Ventilabrella

Citation: Ventilabrella Cushman 1928

Type species: Ventilabrella eggeri Cushman, 1928

Test in the early stages biserial, later with an increase in the number of chambers, but all in one plane, spread out tn a fan-shape; chambers globular; wall calcareous, perforate, smooth or variously ornamented; aperture in the biserial stage, single at the base of the inner margin, in the adult two apertures in each chamber, at opposite sides near the base in the median line. Upper Cretaceous.

The genus Planoglobulina Cushman closely resembles this genus, but the early development of the two is different. In Munich, I had the opportunity of studying Egger's collection containing his type and figured specimens, and among them, the species of Pseudotextularia and its allies from the Upper Cretaceous. The species of Egger upon which I based the genus Planoglobulina, Guembelina acervulinoides Egger, has developed as I stated from a Pseudotextularia-like young, the spiral form of the test very apparent in the specimen and not all in one plane, the later chambers finally developing a fan-shaped mass generally in a single plane. The type specimen is here designated as that figured on PI. xiv, fig. 20 of Egger's work (Abhandl. kon. Akad. Wiss. MUnchen, CI. II, vol. 21, pt. 1, 1899). Such species occur in the Mendez of Mexico, a forma- tion very closely like the Upper Cretaceous of Bavaria, and having most of its species identical with those of that region. This identity becomes very marked as one studies the European material and is much closer than the published figures might seem to indicate. Planoglobulina is therefore a genus directly derived from Pseudotextularia as is clearly shown in the type species. On the other hand Ventilabrella has developed a par- allel arrangement of chambers in the adult but a more precise mathematical series and a more rhomboid test and comes directly from Guembelina. Species of Ventilabrella occur often in great numbers in certain horizons of the Taylor Marl of Texas.

References:

Cushman, J. A. (1928a). Additional genera of the foraminifera. Contributions from the Cushman Laboratory for Foraminiferal Research. 4(1): 1-8. gs V O

			Ventilabrella alpina de Klasz 1953 = Planoglobulina multicamerata
			Ventilabrella austinana Cushman 1938 = Ventilabrella austinana
			Ventilabrella bipartita de Klasz 1953 = Sigalia decoratissima
			Ventilabrella browni Martin 1972 = Planoglobulina browni
			Ventilabrella carseyae Plummer 1931 = Planoglobulina carseyae
			Ventilabrella compressa Van der Sluis 1950 = Gublerina cuvillieri
			Ventilabrella decoratissima De Klasz 1953 = Sigalia decoratissima
			Ventilabrella eggeri Cushman 1928 = Ventilabrella eggeri
			Ventilabrella eggeri glabrata Cushman 1938 = Ventilabrella eggeri
			Ventilabrella manuelensis Martin 1972 = Planoglobulina manuelensis
			Ventilabrella multicamerata De Klasz 1953 = Planoglobulina multicamerata
			Ventilabrella ornatissima Cushman and Church 1929 = Ventilabrella ornatissima
			Ventilabrella reniformis Marie 1941 = Laeviheterohelix reniformis
			Ventilabrella riograndensis Martin 1972 = Planoglobulina riograndensis

CATALOG OF ORIGINAL DESCRIPTIONS: Ventilabrella Cushman 1928

Ventilabrella

References:

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