Catalog - Globigerina globorotaloidea

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Globigerina globorotaloidea

Citation: Globigerina globorotaloidea Colom 1954

Type specimens: pl. 17, figs. 1-25 , X 30.

Type age (chronostrat): Upper Oligocene - Recent

Type locality: Figured specimens (figs. 1-25) from Orihuela, in the southern part of the Province of Alicante, southeastern Spain. Found also at Hurchillo; at Elche; in the central part of the Alicante basin; and in samples from various levels in well no. 1, at La Marina; and in well no. 1, at Rojales; all in the southern part of the province of Alicante; at other localities [not designated] in Spain; in dredgings off the coasts of Galicia and of the Mediterranean generally; and in Trinidad, the Antillas, and Central America [exact localities not given].

Type repository: Depository not given. [Deposited in the author's personal collection, fide Colom, 1960, personal communication.]

Translated from Spanish original text below

"Diagnosis. - A small species, with a spherical contour, with five or six chambers on the last lap, being the last time smaller and with an elongated, narrow, little apparent opening, which runs from the dorsal side to the region umbilical.

"Characters. - Small shell, of spherical contour and chambers unrolled in a rather low trocoidal spiral. On the spiral side count to fourteen to fifteen chambers; those of its first portion tiny, but very visible, globular, growing rapidly and, although somewhat high, usually do not protrude much from the shell; on its last lap there are five in the young specimens and six in the adults, also globular, separated by deep sutural depressions. Umbilical side with a slight central depression and to which the sutures converge of the cameras. Of these, the latter is usually, generally, more reduced, running towards the umbilical side and offering its lobed internal edge slightly and being arranged in such a way that it gives an arched opening, somewhat irregular, narrow and arched, so peculiar (figs. 3-10, 12, 14-18). This is its most distinctive and peculiar character. The opening ends towards the umbilical depression. Its diameter oscillates around 0.40 mm., reaching the adult and well developed specimens, with six chambers on their last lap, about 0.40 or up to 0.50 mm. Its height is about 0.30 mm.

"Diagnosis . - Una especie pequena, de contorno esferoidal, con cinco o seis camaras en la ultima vuelta, siendo muchas veces la ultima mas pequena y con una abertura alargada, estrecha, poco aparente, que se corre desde el lado dorsal hasta la region umbilical.

"Caracteres. - Concha pequena, de contorno esferoidal y camaras desenvueltas en una espiral trocoidal mas bien baja. En el lado espiral cuentanse hasta catorce a quince camaras; las de su primera porcion diminutas, pero bien visibles, globulares, creciendo rapidamente y, aunque algo el elevadas, no suelen sobresalir mucho de la concha; en su ultima vuelta encuentranse cinco en los ejemplares jovenes y seis en los adultos, tambien globulosas, separadas por depresiones suturales profundas. Lado umbilical con una ligera depresion central y a la que convergen las suturas de las camaras. De estas, la ultima suele ser, generalmente , mas reducida, corriendose hacia el lado umbilical y ofreciendo su borde interno lobulado ligeramente y disponiendose de tal manera que da una abertura arqueada, algo irregular, estrecha y al argada, de forma peculiar (figs. 3-10, 12 , 14-18. Es este su caracter mas distintivo y peculiar. La abertura termina hacia la depresion umbilical. Su diametro oscila alrededor de 0.40 mm., alcanzando los ejemplares adultos y bien desarrollados, con seis camaras en su ultima vuelta, unos 0.40 o hasta 0.50 mm . Su altura es de unos 0.30 mm.

Su diametro oscila alrededor de 0.40 mm., alcanzando los ejemplares adultos y bien desarrollados, con seis camaras en su ultima vuelta, unos 0.40 o hasta 0.50 mm . Su altura es de unos 0.30 mm.

Translated from Spanish original text below

Observations. - The peculiar character of its opening is what distinguishes this species, separating it from other related species. In previous publications of mine it was mentioned under the name of Globiterina cf. G. concinna Reuss, but it is not possible to assimilate it to this species, also with five final chambers, but with a large central opening on the umbilical side. Globigerina globorotaloidea may belong to the Globigerina eggeri Rhumbler group of the current seas, due to the shape and arrangement of their chambers, but their shell is more flattened and the arrangement of its opening separates it from the other species in this group. "

"0bservaciones. - El peculiar caracter de su abertura es lo que distingue esta especie, separandola de sus mas afines. En publicaciones mias anteriores fue mencionada bajo el nombre de Globiterina cf. G. concinna Reuss, pero no es posible asimilarla a esta especie, tambien con cinco camaras finales, pero con una gran abertura central en el lado umbilical. Globigerina globorotaloidea es posible que pertenezca al grupo de Globigerina eggeri Rhumbler, de los mares actuales, por la forma y disposicion de sus camaras, pero su concha es mas aplanada y la disposicion de su abertura la separa de las demas especies de este grupo."

References:

Colom, G. (1954). Estudio de las biozonas con foraminiferos del Terciario de Alicante. Boletin del Instituto Geologico y Minero de Espana. 66: 1-279. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina globorotaloidea Colom 1954

Globigerina globorotaloidea

References:

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