CATALOG OF ORIGINAL DESCRIPTIONS: Planomalina apsidostroba Loeblich&Tappan 1946
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Citation: Planomalina apsidostroba Loeblich&Tappan 1946taxonomic rank: SpeciesDescribed on page(s) : 258Type specimens: Plate 37, figures 22-23b; Holotype (Cushman Coll. no. 45667), figured paratype (Cushman Coll. no. 45668) and paratypes (Loeblich Col no. 1090)all from the Main Street formation at locality HTL 102, sample 418. This species is rare in the Weno formation, abundant in the Paw Paw and Main Street formation, and we also have it in the Georgetown Formation.
Original Description Test free, small, planispirally coiled, partially evolute, biumbilicate, with periphery f early portion keeled up to the last camber; chambers numerous, increasing gradually in size, closely appressed, much curved, eight to 10 in the last whorl; sutures strongly curved, bending backward both at the periphery and at the umbilicus, raised and thickened; wall calcareous, coarsely perforate, ornamented by the raised and thickened sutures, which are nodose in the early portion, and the peripheral keel, which has a fimbriate appearance; aperture ovate in outline, at the base of the apertural face of the last-formed chamber, at the periphery of the test, surrounded by a distinct lip, apertural face truncate. Size: Greatest diameter of holotype 0.482 mm.,
least diameter 0.317 mm., greatest thickness of last chamber 0.151 mm. Greatest diameter of paratype of figure 22, 0.367 mm., other
specimens from 0.245 to 0.533 mm. in diameter. Extra details from original publication Remarks - Planomalina apsidostroba, n. sp , somewhat resembles a ventral view of Planulina ariminensis d'Orbigny, but differs, from that species in being completely planispiral and bilaterally symmetrical, les compressed and in possessing the larger peripheral aperture, surrounded by a lip. This species also resembles Planulina cocoaensis Cushman in the dorsal view of the latter, in size, and in number, shape and arrangement of chambers, but differs in the greater thickness, biumbilicate and bilaterally symmetrical test, rather than being slightly trochoid with a ventral boss, in having a fimbriate keel, truncate apertural face, and large rounded peripheral aperture.
References:
Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 3-50. gs
Loeblich, A. R. & Tappan, H. (1946). New Washita Foraminifera. Journal of Paleontology. 20: 238-258. gs
Planomalina apsidostroba compiled by the pforams@mikrotax project teamviewed: 14-12-2024
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Bolli1957 pl01-02.JPG
holotype illus-644.jpg
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Bolli1957 pl01-02.JPG
holotype illus-644.jpg
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