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UNITED STATES NATIONAL MUSEUM BULLETIN 215 



Globigerina venezuelana Hedberg 



Plate 23, Figures 6a-8b 



Globigerina venezuelana Hedberg, Journ. Paleontol., vol. 11, 

 No. 8, p. 681, pi. 92, figs. 7a-b, 1937. — Cushman and 

 Stainforth, Cushman Lab. Foram. Res., Spec. Publ. 14, 

 p. 67, pi. 12, figs. 13a-b, 1945. — Bermtjdez, Cushman Lab. 

 Foram. Res., Spec. Publ. 25, p. 280, pi. 21, figs. 39-40, 1949. 



Globigerina conglomerata Schwager, Beckmann, Eclog. Geol. 

 Helvetlae, vol. 46, No. 2, p. 391, pi. 25, figs. 6-9, 1953. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions): Globigerina ampliapertura zone to Globorotalia 

 menardii zone. 



Locality: Figured hypotypes (USNM P5613) from 

 the Globorotalia fohsi robusta zone, sample JS 46 

 (TTOC 194056); (USNM P5614) from the type sec- 

 tion of the Globorotalia fohsi lobata zone, sample JS 32 

 (TTOC 193786); and (USNM P5615) from the type 

 locality of the Globorotalia menardii zone, sample KR 

 23425 (TTOC 178890). 



Remarks: Considerable variation in size and shape 

 of chambers is found in Globigerina venezuelana. The 

 differences, however, appear not to be constant enough 

 to allow a further division of the species. It is found 

 for instance that the chambers of G. venezuelana are 

 generally more spherical in the Globorotalia opima 

 opima zone to the Globorotalia kugleri zone and again 

 in the Globorotalia fohsi lobata zone to the Globorotalia 

 menardii zone. In the Catapsydrax dissimilis zone to 

 the Globorotalia fohsi fohsi zone the specimens are often 

 somewhat compressed laterally. The same is also true 

 for the Globigerina ampliapertura zone, where many 

 specimens have only 3 chambers io the last whorl 

 instead of the usual 4. 



A small, rudimentary final chamber (see pi. 23, figs. 

 7b, 8b) commonly occurs in Globigerina venezuelana. 

 It is attached in the conventional way and does not 

 cover the umbilicus and therefore can not be regarded 

 as a bulla. 



Globigerina cf. trilocularis d'Orbigny 

 Plate 22, Figures 8a-9c 



Globigerina cf. bulloides d'Orbigny, Cushman and Stainforth, 

 Cushman Lab. Foram. Res., Spec. Publ. 14, p. 68, pi. 13, 

 figs. 4a-b, 1945. 



Globigerina trilocularis d'ORBiGNY, Ann. Sci. Nat., vol. 7, p. 

 277, 1826 (unpublished figures of d'Orbigny in Pornasini, 

 Rend. Accad. Sci. Inst., Bologna, new ser. vol. 2, fasc. 1, 

 pi. 1, figs. 6, 7-7a; p. 12, text-fig.). 



Stratigraphic range (in Cipero formation) : Glo- 

 bigerina ampliapertura zone to Catapsydrax dissimilis 

 zone. 



Locality: Figured specimens (USNM P5616a,b) 

 from the Catapsydrax dissimilis zone, core at 4,543- 

 48 feet of Trinidad Northern Area well Charuma No. 1 

 (TTOC 198467). 



Remarks: The Trinidad specimens resembling the 

 figures of Globigerina trilocularis given by Fornasini 

 are for the present placed in this species. They are 

 restricted ia Trinidad to the lower (Oligocene) part of 

 the Cipero formation, whereas d'Orbigny's type might 

 be from a different level. From observations made on 



material from the Globorotalia kugleri zone, it appears 

 probable that the Globigerina cf. trilocularis can be re- 

 garded as the ancestor of Globigerinoides triloba (Reuss). 

 Specimens of Globigerina trilocularis and Globigerinoides 

 triloba immatura Le Roy were found to be indistinguish- 

 able in this zone, except that the latter showed a 

 supplementary sutural aperture in the last chamber. 



Globigerina juvenilis Belli, new species 

 Plate 24, Figures 5a-6 



Shape of test moderately to distinctly trochospiral; 

 equatorial periphery distinctly lobate. Wall calcare- 

 ous, perforate, surface smooth to very finely pitted. 

 Chambers spherical to ovate; about 12, arranged in 

 about 3 whorls; the 3-4 chambers of the last whorl 

 increase rapidly in size. Sutures on spiral side curved 

 to radial in the early stage, radial in the last whorl, 

 depressed; on umbilical side radial, depressed. Um- 

 bihcus very small. Aperture a low elongate slit, often 

 with a thin lip; iateriomarginal, umbilical. Coiling 

 random. Largest diameter of holotype 0.29 mm. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions) : Globorotalia kugleri zone to Globorotalia menardii 

 zone. 



Locality: Holotype (USNM P5617) from the type 

 section of the Globorotalia fohsi robusta zone, Trinidad, 

 sample JS 16 (TTOC 193261); figured paratype 

 (USNM P5618) from the type section of the Globoro- 

 talia fohsi lobata zone, sample JS 32 (TTOC 193786). 



Remarks : Globigerina juvenilis, new species, appears 

 to be related to G. bradyi Wiesner, but is less distinctly 

 trochospiral. Transitional forms between the two 

 species may be observed. It is also possible that 

 Globigerina juvenilis represents the juvenile stage of 

 Globigerinita naparimaensis Bronnimann, where the 

 bulla is not yet developed (for comparison see BoUi, 

 LoebUch and Tappan, 1957, pi. 8, figs. la-c). 



Globigerina bradyi Wiesner 

 Plate 23, Pigtjees 5a-c 



Globigerina sp., Brady, Rep. Voy. Challenger, zool., vol. 9, p. 



603, pi. 82, figs. 8, 9, 1884. 

 Globigerina bradyi Wiesner, Deutsche Siidpolar-Expedition 



1901-1903, vol. 20 (zool., vol. 12), p. 133 (for figs, see Brady 



op. cit.), 1901-1903. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions) : Globorotalia kugleri zone to Globorotalia menardii 

 zone. 



Locality: Figured hypotype (USNM P5619) from 

 the type locality of the Globorotalia menardii zone, 

 sample KR 23425 (TTOC 178890). 



Remarks: The Trinidad specimens here described 

 as Globigerina bradyi seemingly agree well in size and 

 general shape with Brady's figures of Globigerina sp., 

 which later were named by Wiesner as G. bradyi. 

 Occasionally, specimens are seen that have one or 

 several secondary sutural apertines on the last chamber. 

 They should probably be placed in Globigerinoides 

 minuta Natland. The two species seem to be synony- 



