Catalog - Globoquadrina

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Globoquadrina

Citation: Globoquadrina Finlay 1947

Type species: Globorotalia dehiscens Chapman, Parr and Collins, 19 34

Shell subquadrate, in both ventral and side view, dorsally flattened and showing all chambers, ventrally inflated and elongate, showing last coil only; umbilicus more or less widely open, often permitting considerable view of interior of previous chambers, but sometimes closed in adult by encroachment of last chambers; ends of chambers j uttin g round it angular and often more spinose; chambers horizontally compressed, inner face flatt ish, outer lightly to strongly convex, joins forming a marked angle, typically about 90° so that a squarish outline results, but sometimes with greater angle and slightly more than 4 chambers in a coil; terminal face smooth and sinuous, meeting other faces in a sharp angle and slanting strongly inwards to umbilicus (in some species vertically), with a pronounced thin flap projecting inwards and downwards overhanging aperture and largely concealing it; aperture rather narrowand elongate, not widely gaping as in Globigerina and Globorotalia, only a fraction of terminal face in area.

Family Globorotaliidae.

The distinguishing characters of this group are excellently shown in the original figures of the genotype. It combines the open umbilicus, terminal face, and apertural flaps of Globotruncana, the angular ventrally pointed chambers of Globorotalia, and the general compact shape of Globigerina, and plainly should not be referred to any one of these.

Not many species of this genus seem to have been described, but it is well distributed. Most Miocene off-shore faunas seem to contain a representative, and it is possible that typical forms may be limited to Upper Oligocene and Miocene. At least three already described species belong here, all described from the Middle Tertiary. Globorotalia quadraria Cushman and Ellisor (1939) from the Pliocene of Louisiana (this was compared with the Cuban Eocene G. centralis Cushman and Bermudez, which is not congeneric, but closely related, as originally stated, to cocoaensis Cushman); Globigerina altispira Cushman and Jarvis (1936) from the Miocene of Jamaica (this has more chambers per whorl than usual, but the same characteristic umbilical and apertural features ); and Globigerina venezuelana Hedberg (1937) from the Upper Oligocene of Venezuela. Besides these, I have seen distinct species in the Cipero beds (Nos. 12 and 13) of Trinidad, in the A. 3 zone of the Manta beds of Ecuador, and in the Upper Miocene of Fiji and New Guinea. No forms have been seen in the Pliocene faunas available , but possibly the species figured by Cushman (1941 pl. 10, figs. 18-19) as Globigerina helicina d'Orb. from Rimini may belong here. The genotype is common and limited to the Australian Miocene; New Zealand specimens previously referred here prove to be distinct and are now described as Globoquadrina subdehiscens Finlay and G. primitiva Finlay.

References:

Finlay, H. J. (1947). New Zealand foraminifera: Key species in stratigraphy - no. 5. New Zealand Journal of Science and Technology. 28(5): 259-292. gs

			Globoquadrina altispira conica Brönnimann & Resig 1971
			Globoquadrina altispira subsp. globosa Bolli 1957 = Dentoglobigerina globosa
			Globoquadrina asanoi Maiya, Saito, & Sato 1976 = Neogloboquadrina dutertrei
			Globoquadrina dehiscens praedehiscens Blow & Banner 1962 = Dentoglobigerina tripartita
			Globoquadrina globularis Bermúdez 1961 = Dentoglobigerina globularis
			Globoquadrina himiensis Maiya, Saito, & Sato 1976 = Neogloboquadrina dutertrei
			Globoquadrina kagaensis Maiya, Saito, & Sato 1976 = Neogloboquadrina dutertrei
			Globoquadrina langhiana Cita & Gelati 1960 = Dentoglobigerina baroemoenensis
			Globoquadrina larmeui Akers 1955 = Dentoglobigerina larmeui
			Globoquadrina obesa Akers 1955 = Dentoglobigerina sellii
			Globoquadrina subsp. pachyderma pacifica Boltovskoy & Watanabe 1986
			Globoquadrina palmerae Bermúdez 1961
			Globoquadrina patriciae McCulloch 1977 = Globorotalia hirsuta
			Globoquadrina pozonensis Blow 1959 = Dentoglobigerina globosa
			Globoquadrina primitiva Finlay 1947 = Acarinina primitiva
			Globoquadrina pseudofoliata Parker 1967 = Globoquadrina conglomerata
			Globoquadrina quadraria advena Bermudez 1949
			Globoquadrina sellii Borsetti 1959
not figured			Globoquadrina subdehiscens Finlay 1947 = Globoquadrina dehiscens
			Globoquadrina tripartita subsp. laxispira Fordham 1986
			Globoquadrina tripartita subsp. tricamerata Fordham 1986

CATALOG OF ORIGINAL DESCRIPTIONS: Globoquadrina Finlay 1947

Globoquadrina

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