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Species Acarinina punctocarinata Fleisher 1974


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Strongly muricate normal perforate, nonspinose. Test morphology: Low-trochospiral, 4 inflated, wedge-shaped chambers in last whorl, distinctly longer axially than radially broad; umbilicus open, deep, and generally relatively wide; aperture a low arch bordered by distinct lip extending towards, but not reaching, the peripheral margin; short, blunt muricae concentrated on umbilical shoulders but no circumumbilical muricate rim; sutures radial to slightly curved, distinctly incised; spiral side with radial to slightly curved sutures; distinctly punctate pseudocarina formed by peripheral concentration of muricae; in edge view periphery is subacute with distinctly punctate pseudocarina. Size: Maximum diameter of holotype 0.33 mm, thickness 0.24 mm.
Discussion / Comments:
Pearson et al. (2006):
DISTINGUISHING FEATURES.- This taxon is distinguished from bullbrooki in the tangential elongation of its chambers (giving the test a semirectangular vs. (sub)quadrate shape), development of wedge-shaped chambers on the umbilical side, generally more angulo-conical umbilical profile and distinct punctate pseudocarina formed by peripheral concentration of blunt, thick muricae. DISCUSSION.- Lower middle Eocene strata are characterized by a robust acarininid with distinctly wedge-shaped chambers and a peripheral concentration of thick, blunt muricae. Fleisher (1 974) denominated this morphotype Acarinina punctocarinata. PHYLOGENETIC RELATIONSHIPS.- Evolved from A. boudreauxi (see also Blow, 1979, p. 936-937). GEOGRAPHIC DISTRIBUTION.- Cosmopolitan distribution (from tropical to austral regions). STRATIGRAPHIC RANGE.- Zone E7 (upper part) to Zone Ell.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Truncorotaloididae
    Genus Acarinina
     Species Acarinina punctocarinata
Synonym list:
Pearson et al. (2006):
p 1953 Globorotalia crassaformis Galloway & Wissler. - Subbotina : p.223 pl. 21; fig. 5a-c [lower part of Zone of acarininids, Foraminiferal Beds, Green Group, Kuban River, Noth Caucasus]; [not Galloway and Wissler, 1927]
1974 Acarinina punctocarinata Fleisher. - Fleisher : p.1014 pl. 3; fig. 4-6 (holotype), 7, 8 [Zone P11, DSDP Site 220, Arabian Sea]
2006 Acarinina punctocarinata Fleisher. - Pearson et al. : p.273 pl. 9.5; fig. 1-8 (Pl. 9.5, Figs. 1-3: new SEMs of holotype of Acarinina punctocarinata Fleisher)
Specimen:
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 211532
References:

Subbotina,N.N. (1953):
Iskopaemye foraminifery SSSR (Globigerinidy, Khantkenininidy i Globorotaliidy) . Trudy Vsesoyznogo Nauchno-Issledovatel'skogo Geologo-razvedochnogo Instituta (VNIGRI) Vol. 76 p. 296

Fleisher,R.L. (1974):
Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A.
In: Initial Reports of the Deep Sea Drilling Project Vol. 23 Eds: Whitmarsh, R.B.Weser, O.E.Ross, D.A. p. 1001-1072

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