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Linked specimens: USNM-446770
Current identification/main database link: Globorotalia cavernula Bé, 1967
Test free, medium in size compared with other species of Globorotalia, trochospiral, sinistrally coiled, biconvex, the umbilical side considerably more convex than the spiral side (rare specimens are equally biconvex). There are also planoconvex tests in which the spiral side is flat; equatorial periphery almost circular; peripheral outline strongly lobate. Axial periphery angled, sometimes rather round. Chambers angular, rhomboid, about 13-16 in the whole test arranged in 2.5-3 coils. Early whorl sometimes raised above the subsequent ones. Five chambers compose the final whorl; often they are offset from each other creating an imbricate appearance on the spiral side. Sutures variable from simple to strongly limbate, sometimes raised; curved on the spiral side, curved or radial, and depressed on the umbilical side. Umbilicus can be closed or narrow and deep. Aperture arched, interiomarginal, extraumbilical-umbilical, bordered by a rim. Wall calcareous, moderately thick, fairly smooth, rather coarsely perforate, sometimes pustulate on the umbilical side near the aperture.
Size: The largest diameter 0.25-0.45 mm. The height of the test 0.16-0.30 mm. Dimensions of the holotype: greatest diameter 0.40 mm; height 0.21 mm
Etymology: the test of this species resembles a flower; hence the name petaliformis (petalled)
Extra details from original publication
Occurrence: Globorotalia petaliformis n. sp. occurred abundantly in the middle Miocene deposits of Site 254 and as rare or isolated specimens in middle Miocene of Sites 253 and 255, and in upper Miocene of Sites 253-255.
Diagnosis and comparison: The most striking features of Globorotalia petaliformis n. sp. are the very lobate peripheral outline and the often step-like sutures on the spiral side which give an imbricate appearance. Because of these characteristics, the test of this species resembles a flower; hence the name petaliformis (petalled).
It is a very variable species, especially concerning its biconvexity, the character of the sutures, the kind of angularity of the peripheral margin, and its imbricate appearance. However, it is a very peculiar and easily identifiable foraminifer which is not closely related to any Globorotalia as yet described. Some tests of Globorotalia petaliformis n. sp., because of the imbricate appearance, resemble the Recent cold-water species Globorotalia cavernula Bé.
Observations: I prefer to establish it as a new taxon and not to put it in open nomenclature because it is a very peculiar, typical, and easily identifiable species which, in addition, has a relatively short stratigraphic range. In spite of all my efforts to find at least a related species, I was not able to find any.
Holotype: (Plate 14, Figures la, 1b) FMACN 7646. Paratypes: About 400 specimens from the middle and upper Miocene of Sites 253, 254, 255, and 258 of L5g 26 of the DSDP - FMACN 7647. Type locality: Holotype:
Boltovskoy, E. (1974c). Late Pliocene and Quaternary paleoclimatic changes, Indian Ocean, DSDP, leg 26. Initial Reports of the Deep Sea Drilling Project. 26: 743-744. gs :: :: Boltovskoy, E. (1974d). Neogene planktonic foraminifera of the Indian Ocean (DSDP, leg 26). Initial Reports of the Deep Sea Drilling Project. 26: 675-741. gs :: ::
Boltovskoy, E. (1974c). Late Pliocene and Quaternary paleoclimatic changes, Indian Ocean, DSDP, leg 26. Initial Reports of the Deep Sea Drilling Project. 26: 743-744. gs :: ::
Boltovskoy, E. (1974d). Neogene planktonic foraminifera of the Indian Ocean (DSDP, leg 26). Initial Reports of the Deep Sea Drilling Project. 26: 675-741. gs :: ::
Globorotalia petaliformis compiled by the pforams@mikrotax project team viewed: 6-7-2020
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