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| Anonymous: Unedited TaxonConcept data | ||||||
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Species Acarinina boudreauxi Fleisher 1974 | ||||||
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| Diagnosis / Definition: | ||||||
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Pearson et al. (2006): DESCRIPTION. Type of wall: Robust, heavily calcified, wall with blocky fused muricae. Test morphology: Subcircular planconvex test, coiled in a low trochospiral with 4 1/2-5 chambers in the final whorl; chambers radially compressed and appressed with flat or slightly depressed sutures on a flat spiral side; aperture umbilical-extraumbilical, a low arch; ventral sutures straight, radial and depressed converging on a narrow, deep umbilicus; periphery subacute. Size: Maximum diameter of holotype 0.28 mm; thickness 0.21 mm. |
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| Discussion / Comments: | ||||||
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Pearson et al. (2006): DISTINGUISHING FEATURES.- Acarinina boudreauxi is distinguished from A. interposita by the much tighter coil and more compressed chambers, and by having straight radial sutures on the umbilical side and an anguloconical test. Acarinina boudreauxi differs from A. punctocarinata by lacking a discontinuous muricocarina and typically being smaller; it differs from A. bullbrooki by its rounded profile and more slowly expanding chambers and the $112-5 (as opposed to 4) chambers in the final whorl. DISCUSSION.- This taxon has rarely been used, but is nevertheless a distinctive form. Originally described from Zones P9 to P1 1 in the Arabian Sea area, it has recently been found at the same levels in Tanzanian drill cores (PI. 9.5, Figs. 13-16). Acarinina boudreauxi is clearly related to the A. bullbrooki group, particularly the matthewsae morphotype described by Blow (1979) (here considered conspecific with bullbrooki) but appears lowerlearlier in the record, and provides a possible evolutionary link for that group with lower Eocene Acarinina pseudotopilensis. PHYLOGENETIC RELATIONSHIPS.- Possibly evolved from Acarinina pseudotopilensis and was ancestral to A. punctocarinata and A. bullbrooki. STRATIGRAPHIC RANGE.- Ranges from the lower Part of Zone E7 to within Zone E9. GEOGRAPHIC DISTRIBUTION.- Probably widespread; currently known only from the Indian Ocean. STABLE ISOTOPE PALEOBIOL0GY.- No data available. |
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| Systematics: | ||||||
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35 Ordo Foraminiferida Superfamilia Globigerinaceae Familia Truncorotaloididae Genus Acarinina Species Acarinina boudreauxi |
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| Synonym list: | ||||||
| Pearson et al. (2006): 1974 Acarinina boudreauxi Fleisher. - Fleisher : p.1112 pl. 1; fig. 2-5 [lower middle Eocene Zone P 11, DSDP Site 2 19, Arabian
Sea]
2006 Acarinina boudreauxi Fleisher. - Pearson et al. : p.273 pl. 9.5; fig. 9-16 (Pl. 9.5, Figs. 9-1 1: new SEMs of holotype of
Acarinina boudreauxi Fleisher)
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| Specimen: | ||||||
| Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 211386 |
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| References: | ||||||
Fleisher,R.L. (1974): 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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