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Species Dipsidripella liquianyui Huber & Pearson 2006 | ||||||
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| Diagnosis / Definition: | ||||||
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Pearson et al. (2006): DESCRIPTION.- Type of wall: Microperforate to finely perforate, surface hispid to moderately pustulose, pustules scattered on umbilical and spiral surfaces of test. Test morphology: Test very small, equally biconvex to planoconvex, weakly lobulate, circular to subcircular in equatorial outline, axial periphery rounded to slightly compressed; 5-7 subglobular chambers, sometimes becoming slightly reniform in the final whorl, coiled in a low trochospire, increasing gradually in size; sutures weakly depressed, radial on umbilical side; umbilicus broad and shallow, often ornamented with a random scattering of pustules; aperture a subcircular extraumbilical-umbilical arch that is bordered by a narrow to moderately broad, equidimensional lip. Size: Holotype (USNM 523431) maximum diameter 0.10 mm, bradth 0,04 mm; Paratype (USNM 523432) maximum diameter 0.09 mm, bradth 0.04mm. |
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| Discussion / Comments: | ||||||
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Pearson et al. (2006): ETYMOLOGY.- Named in honor of Li Quianyu for his important contributions to the study of microperforate planktonic foraminifera. DISTINGUISHING FEATURES.- Differs from species included in Tenuitella by having a larger pore size, its more evolute test with a less lobate equatorial periphery, lower trochospire, more flattened spiral side, shallower, broader umbilicus, and presence of pustules in the umbilicus. Differs from Dipsidripella danvillensis by its more evolute test, less lobate axial periphery, more flattened spiral side, broader interiomarginal aperture, and absence of secondary accessory apertures. DISCUSSION.- This new species is placed in Dripsidripella because of its finely perforate test, smooth pustulose to hispid surface texture, and highly arched interiomarginal aperture. Because of its small size and thin shell wall this taxon is easily to overlook in microfossil assemblages and is prone to dissolution and recrystallization. As a result, its stratigraphic and geographic disrtibution have been incompletely documented and its taxonomic status cannot be firmly resolved until better preserved specimens are studied. Specimens that were described as Planorotalites sp. 1 and Praetenuitella sp. 2 by Huber (1991) from middle and upper Eocene chalk sediments at ODP Site 738 (Kerguelen Plateau) are now placed in D. liquianyui as they differ only in degree of evoluteness in coiling and axial compression of the test. PHYLOGENETIC REALTIONSHIPS.- May have evolved from D. danvillensis during the middle Eocene. STRATIGRAPHIC RANGE.- Middle Eocene Zone E11 trough Oligocene Zone O1. GEOGRAPHIC DISTRIBUTION.- Identified only in the southern Indian Ocean at ODP Site 738 (Kerguelen Plateau) and Site 761 (Wombat Plateau). STABLE ISOTOPE PALEOBIOLOGY.- No data available. |
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| Systematics: | ||||||
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35 Ordo Foraminiferida Superfamilia Globigerinaceae Familia Cassigerinellidae Genus Dipsidripella Species Dipsidripella liquianyui |
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| Synonym list: | ||||||
| Pearson et al. (2006): 1990 Testacarinata inconspicua Howe. - Stott & Kennett : p.560 pl. 7; fig. 13, 14 [late middle Eocene, ODP Site 869, Maud Rise,
Waddell Sea]; [Not Howe, 1939]
1991 Planorotalites sp. 2 . - Huber : p.440 pl. 6; fig. 23-24 [lower Eocene, Zone AP6a, ODP Hole 738C,
Kerguelen Plateau, southern Indian Ocean]
1991 Praetenuitella sp. 2 . - Huber : p.440 pl. 7; fig. 3, 4 [upper Eocene, Zone AP12, ODP Hole 738B,
Kerguelen Plateau, southern Indian Ocean]
2006 Dipsidripella n sp. liquianyui Huber & Pearson. - Pearson et al. : p.500 pl. 16.9; fig. 1-17
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| Specimen: | ||||||
| Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 523431 Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 523432 |
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| References: | ||||||
Stott,L.D. and Kennett,J.P. (1990): Huber,B.T. (1991): Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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