STUDIES IN FOKAMINIFERA 



41 



Genus Rotalipora Brotzen, 1942 * 



Plate 9, Figures 5a-7c and Plate 10, Figures la-c 



Rotalipora Brotzen, Sveriges Geol. Undersokning, Avh. ser. C, 



No. 451 (Irsbok. 36, No. 8), p. 32, 1942. 

 Thalmanninella Sigal, Rev. de I'lnst. Franjais du Petiole et 



Annates des Combustibles liquides, vol. 3, No. 4, p. 101, 



1948. (Type species: Thalmanninella brotzeni Sigal, 1948. 



Fi.xed by original designation and monotypy.) 

 Ticinella Reichbl, Eclog. Geol. Helvetiae, vol. 42, No. 2, p. 600, 



1950. (Type species; Anomalina roberti Gandolfi, 1942. 



Fixed by original designation and monotypy.) 



Type species: Rotalipora iuronica Brotzen, 1942. 

 Fbced by original designation and monotypy. 



Test free, trochospiral, biconvex to planoconvex, 

 umbilicate, periphery rounded or with a single keel; 

 chambers ovate to angular-rhomboid; sutures on spiral 

 side curved, depressed to elevated, may be beaded, on 

 umbilical side flush to depressed, radial or slightly 

 curved; wall calcareous, perforate, radial in structure, 

 surface in general smooth; primary aperture interio- 

 marginal, extraumbilical-umbilical, and may be bordered 

 above by a lip, secondary apertures sutural on the 

 umbilical side, one per suture or rarely two or more, and 

 each may be bordered by a narrow lip. 



Remarks: Rotalipora differs from Olobotruncana 

 Cushman in possessing an interiomarginal, extramn- 

 bilical-umbilical primary apertirre, in having secondary 

 sutural apertures and an open umbilicus, and in lacking 

 the umbilical tegilla. 



Thalmanninella Sigal is here considered a synonym 

 of Rotalipora, as an examination of specimens identified 

 by the authors of both type species shows no funda- 

 mental differences. The secondary sutural apertures 

 may be situated in various positions along the sutures, 

 from the midregion of the suture to the inner margin of 

 the umbilical rim, and may then be aligned at an angle. 

 In every case these sutural apertures open into the 

 chambers themselves and not into the umbilicus. The 

 topotype of Thalmanninella brotzeni Sigal, here figured, 

 shows some of these secondary apertures which are as 

 definitely sutural in position as those of the figiu-ed 

 specimen of Rotalipora iuronica Brotzen. The remain- 

 ing differences are only of specific importance. 



Ticinella was defined by Reichel as having apertural 

 characters identical with those of Thalmanninella Sigal. 

 He separated Ticinella on the basis of the globular 

 chambers and absence of a keel other than a slight indi- 

 cation of one in the early chambers. Thalmanninella 

 was characterized by a simple marginal keel, but this 

 was also stated to be commonly absent in the last 

 chambers. Both have been recorded from the Ceno- 

 manian, although Ticinella has been recorded as lower 



" The genus BUicintUa Sigal was recently described (rotn tlie Vraconnian as related 

 to Rotalipora, in having accessory apertures at the posterior border of each cham- 

 ber. As the present article was already in press and no specimens of Biticiiiella were 

 were available to the WTiters, the genus is not fully discussed herein. If there are 

 true accessory apertures at the posterior border of the chambers and the test is asym- 

 metrically colled as described it would seem to be related to the Globorotallidae, 

 although no other genus of this family has accessory apertures on both sides. If 

 however, the test is planispiral, the aperture equatorial as sho^^'n, and the "accessory 

 apertures*' should prove to be relict apertures instead, Bitkinella would become a 

 synonym of Ptanomalina. An examination of additional specimens is necessary to 

 correctly place the genus. 



in the Cenomanian and ?Albian. Nevertheless, as their 

 sole distinction is a matter of degree (Ticinella is with- 

 out a keel except in the early chambers and Thalman- 

 ninella may be without one in the later chambers), 

 we consider Ticinella Reichel also a junior synonym of 

 both Thalmanninella Sigal and Rotalipora Brotzen. 



Types and occurrence: Figured hypotype oi Rota- 

 lipora turonica Brotzen (USNM P50) and unfigured 

 hypotypes (USNM P4237) from the lower Turonian, 

 Gristow, Sweden. 



Figured topotype of Thalmanninella brotzeni Sigal 

 (USNM P3930) from the middle Cenomanian, Sidi- 

 Aissa, Algeria. 



Figured hypotype of Ticinella roberti (Gandolfi) 

 (USNM P4829) from Breggia Number 27, lower Ceno- 

 manian, Canton Ticino, Switzerland. 



Figured specimen of Rotalipora cf . appenninica (Renz) 

 (USNM P4873) from the Cenomanian Del Rio forma- 

 tion on right bank of Shoal Creek just south of the 34th 

 Street bridge, in Austin, Travis County, Texas. Col- 

 lected by H. T. and A. R. Loeblich, Jr. 



Range: Albian to Turonian. 



Genus Globorotalia Cushman, 1927 



Plate 10, Figures 2a-4c 



Globorotalia Cushman, Contr. Cushman Lab. Foram. Res., vol. 

 3, pt. 1, p. 91, 1927. 



Truncorolalia Cushman and Bermudez, Contr. Cushman Lab. 

 Foram. Res., vol. 25, p. 35, 1949. (Type species: Rolalina 

 truncalulinoides d'Orbigny, 1839. Fixed by original desig- 

 nation.) 



Turborotalia Cushman and Bermudez, Contr. Cushman Lab. 

 Foram. Res., vol. 25, p. 42, 1949. (Type species: Globoro- 

 talia centralis Cushman and Bermudez, 1937. Fixed by 

 original designation.) 



Acarinina Subbotina, Trudy Vses. Neft. Naukno-Issledov. 

 Geol.-Razved. Inst., n. ser. 76, p. 219, 1953. (Type species: 

 Acarinina acarinaia Subbotina, 1953. Fixed by original 

 designation.) 



Globanomalina Haque, Palaeontol. Pakistanica, vol. 1, p. 148, 

 1956. (Type species: Globanomalina ovalis Haque, 1956. 

 Fixed by original designation.) 



tPseudogloborolalia Haque, Ibid., vol. 1, p. 184, 1956, (Type 

 species: Pseudogloborolalia ranikotensis Haque, 1956. Fixed 

 by original designation.) 



Type species: Pulvinulina menardii (d'Orbigny) 

 var. tumida Brady, 1877. Fixed by original designation 

 and monotypy. 



Test free, trochospiral, biconvex to umbilicoconvex, 

 umbilicate, periphery with or without a single keel; 

 chambers ovate to angular rhomboid or angular conical ; 

 sutures on the spiral side depressed to elevated, curved 

 or radial, may be thickened on the umbilical side, de- 

 pressed and radial; wall calcareous, finely perforate, 

 radial in structure, surface smooth to hispid; aperture 

 interiomarginal, an extraumbilical-umbilical arch bor- 

 dered by a lip, varying from a narrow rim to a broad 

 spatulate to triangular fiap. 



Remarks: Globorotalia differs from Globotruncana 

 Cushman in having an interiomarginal, extraumbihcal- 

 umbilical aperture and a simple umbilicus, and in 

 lacking the umbilical tegilla and accessory intralaminal 



