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Species Acarinina africana Naggar 1966 | ||||||
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| Diagnosis / Definition: | ||||||
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Pearson et al. (2006): DESCRIPTION. Type of wall: Muricate, normal perforate, nonspinose. Test morphology: Peripheral outline oval, elongate, strongly lobulate; weakly planoconvex to biconvex; test axially compressed; peripheral margin acutely pinched, occasionally with weak muricate keel; chambers triangular on both umbilical and spiral sides; low trochospiral; approximately 10- 12 chambers arranged in approximately 3 whorls; chambers vary ontogenetically, with early chambers globular to subconical and later chambers more lenticular, strongly compressed; moderate rate of chamber expansion; sutures gently curved, radial, slightly raised to depressed; primary aperture a low umbilical-extraumbilical arch extending to peripheral margin, sometimes with faint lip; typically 4-6 chambers in final whorl; umbilicus narrow. Size: Diminutive, typically <0 .20 mm; holotype dimensions: maximum diameter: 0.30 mm; minimum diameter: 0.20 mm; thickness: 0.14 mm (last chamber) (El Naggar, 1966, p. 194). |
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| Discussion / Comments: | ||||||
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Pearson et al. (2006): DISTINGUISHING FEATURES.- Acarinina africana is distinguished from A. sihaiyaensis by its axially compressed test, strongly lobulate peripheral margin, and manner in which its chambers change ontogenetically from globular to more lenticular shapes. DISCUSSION.- Acarinina africana is a very distinctive and short-lived taxon that is characteristic of the Paleocene-Eocene Thermal Maximum (PETM) event (Kelly and others, 1998). PHYLOGENETIC RELATIONSHIPS.- This species is closely related to A. sibaiyaensis and was probably derived from A. esnehensis via A. sihaiyaensis during the period of intense environmental stress associated with the PETM event. STRATIGRAPHIC RANGE.- Restricted to Zone El, most commonly found within carbon isotope excursion interval of the PETM, although rare specimens (?reworked) have been observed at stratigraphically higher horizons (Kelly and others, 1998). GEOGRAPHIC DISTRIBUTION.- Ranges from tropical to temperate regions; central equatorial Pacific (ODP Site 865), New Jersey Coastal Plain (Bass River), Tethyan deposits of northern Africa (Egypt) and probable occurrences in Spain (Alamedilla). 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 africana Species Acarinina boudreauxi |
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| Synonym list: | ||||||
| Pearson et al. (2006): 1966 Globorotalia africana El Naggar. - El-Naggar : p. 193-194 pl. 23; fig. 4a-c [G. aequa / G. esnaensis Subzone, G. velascoensis
Zone, Gebel Owaina, Egypt]
non 1979 Globorotalia (Morozovella) africana El Naggar. - Blow : p.983 pl. 104; fig. 7-10
1998 Morozovella africana El Naggar. - Kelly et al. : p. 158-159 fig. 5D [upper Zone P5, from within
carbon isotope excursion of late Paleocene Thermal
Maximum, ODP Holc 865C, Allison Guyot, central
equatorial Pacific Ocean]
non 1999 Acarinina aff. africana Naggar. - PARDO et al. : p.44 pl. 2; fig. 13-14
2006 Acarinina africana Naggar. - Pearson et al. : p.265 pl. 9.1; fig. 1-16
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| Specimen: | ||||||
| Natural History Museum, London, Inventory number: USNM 494823 |
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| References: | ||||||
El-Naggar,Z.R. (1966): Blow,W.H. (1979): Kelly,.; Bralower,. and Zachos,. (1998): PARDO,A..; Keller,G. and Oberhansli,H.. (1999): 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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