Acarinina sibaiyaensis El Naggar 1966 (TaxonConcept

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Species Acarinina sibaiyaensis El Naggar 1966

Diagnosis / Definition:

Pearson et al. (2006):
DESCRIPTION. Type of wall: Muricate, nonspinose, normal perforate. Test morphology: Planoconvex; generally umbilico-convex, although some specimens approach being planispiral; peripheral margin round to subround; chambers inflated, subtriangular to round on both umbilical and spiral sides; approximately 12- 14 chambers arranged in 3 whorls; gradual increase in chamber size throughout; sutures depressed and radial; primary aperture circular, arch-like opening with lip to well-developed flange, umbilical-extraumbilical position Size: Maximum diameter of holotype 0.29 mm, minimum diameter 0.19 mm, thickness 0.17 mm; our observations suggest that this form is typically <0.35 mm in maximum diameter.

Discussion / Comments:

Pearson et al. (2006):
DISTINGUISHING FEATURES.- Diagnostic characteristics are the relatively large (5-9) number of chambers in final whorl, and the test coiled in a very low trochospiral (approaching planispiral) mode. DISCUSSION.- This form, together with A. africana and Morozovella allisonensis, constitute an assemblage of small, morphologically distinct taxa that are characteristic of the temporally short (-200 kyrs) Paleocene Eocene Thermal Maximum. PHYLOGENETIC RELATIONSHIPS.- Kelly and others (1996) suggested that this taxon evolved from Acarinina soldadoensis, but it shows much greater similarity with A. esnehensis which we suggest was the ancestor. Further flattening of the test produced the africana morphology (Kelly and others, 1998). STRATIGRAPHIC RANGE.- Zone El, restricted to carbon isotope excursion of the PETM. GEOGRAPHIC DISTRIBUTION.- Widely distributed throughout the (sub)tropics and temperate regions; common in the central equatorial Pacific (ODP Site 865), found in New Jersey Coastal Plain (Bass River), North Atlantic Ocean (ODP Site 1051), and also present in Tethyan sections of Europe (Alamedilla, Spain) and North Africa (Egypt). STABLE ISOTOPE PALEOBIOL0GY.- Inferred depth-habitat primarily shallow mixed-layer; carbon isotope signature exhibits strong covariance with shell size; overall stable isotopic signature is analogous to that of modem, symbiotic species (Kelly and others, 1998).

Systematics:

35
Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Truncorotaloididae
    Genus Acarinina
     Species Acarinina sibaiyaensis

Synonym list:

Pearson et al. (2006):

1966 Globorotalia sibaiyaensis El Naggar. - El Naggar : p.235 pl. 23; fig.6a-c [G. aequa/G. esnaensis Subzone, G. velascoensis Zone, Gebel Owaina section, Egypt]

1996 Acarinina sibaiyaensis El Naggar. - Kelly et al. : p.424 fig. 2.1a-b [upper Zone P5, from within carbon isotope excursion of the Paleocene-Eocene Thermal Maximum, ODP Hole 865C, Allison Guyot, equatorial Pacific Ocean]

1998 Acarinina sibaiyaensis El Naggar. - Kelly et al. : p.159 fig. 5c, 9d-e [upper Zone PS, from within carbon isotope excursion of Palcocene-Eocene Thermal Maximum, ODP Hole 865C, Allison Guyot, equatorial Pacific Occan]

1999 Acarinina sibaiyaensis El Naggar. - PARDO et al. : p.44 pl. 2; fig. 19-20 [Zone P5b, Kaurtakapy, Kazakhstan]

1999 Acarinina aff. sibaiyaensis El Naggar. - PARDO et al. : p.44 pl. 2; fig. 17-18 [Zone PSb, Kaurtakapy, Kazakhstan]

2006 Acarinina sibaiyaensis El Naggar. - Pearson et al. : p.313 pl. 9.21; fig. 1-16

Specimen:

Natural History Museum, London, Inventory number: P. 45628
Natural History Museum, London, Inventory number: P. 45629
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 494822

References:

El Naggar,Z.R.M. (1966):
Stratigraphy And Planktonic Foraminifera of the Upper Cretaceous - Lower Tertiary Succession in the Esna-Idfu Region. Nile Valley, Egypt . Egypt. Bull. Geol.Supp 2 p. 279 pp

Kelly,D.C.; Bralower,T.J.; Zachos,J.C.; Premoli Silva,I. and Thomas,E. (1996):
Rapid diversification of planktonic foraminifera in the tropical Pacific (ODP Site 865) during the late Paleocene thermal maximum . Geology Vol. 24 p. 423-426

Kelly,.; Bralower,. and Zachos,. (1998):
On the demise of the Early Paleogene Movozovella velascoensis lineage: terminal progenesis in the planktonic foraminifera . Palaios Vol. 16 p. 507-523

PARDO,A..; Keller,G. and Oberhansli,H.. (1999):
Paleoecologic and paleoceanographic evolution of the Tethyan realm during the Paleocene-Eocene transition . Journal of Foraminiferal Research Vol. 29 p. 37-57

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513

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