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Species Morozovella allisonensis Kelly et al. 1998 | ||||||
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| Diagnosis / Definition: | ||||||
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Pearson et al. (2006): DESCRIPTION.- Type of wall: Normal perforate, muricate, nonspinose. Test morphology: Low to medium trochospiral test, subcircular, weakly to non-lobulate peripheral outline, chambers triangular on umbilical side, trapezoidal to subquadrate oispiral side as a function of degree of curvature of intercameral sutures; in umbilical view primary aperture low arch to subcircular, umbilical to extraumbilical in position extending to peripheral margin; typically 5-9 chambers in the final whorl; sutures depressed, straight to slightly curved, radial; umbilicus generally small, deep varying with tightness of coiling; chambers with unornanlented rounded umbilical shoulders, slight tendency to be umbilically inclined as a function of axial compression; on the spiral side approximately 12-17 chambers arranged in about 3 whorls; chambers flattened to moderately inflated; gradual increase in chamber size throughout; sutures muricate, strongly to weakly curved, varying from raised to slightly depressed; in edge view umbilico-convex to planar; spiral side flat to slightly convex; test periphery subrounded to acute; weakly muricate keel. Size: Holotype maximum diameter: approximately 0.35 to 0.40 mm. |
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| Discussion / Comments: | ||||||
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Pearson et al. (2006): DISTINGUISHING FEATURES.- This taxon is characterized by varying degrees of axial compression; it is biconvex to mildly planoconvex in edge view; umbilical tips of chambers are relatively rounded and unornamented. DISCUSSION.- This taxon exhibits a wide range of morphological plasticity that is a function of degree of axial compression. We have observed the relatively high conical morphotypes intermediate between the typical end members of the veluscoensis-allisonensis group within the CIE in the Dababiya and Qreiya sections in Egypt. PHYLOGENETIC RELATIONSHIPS.- This ephemeral taxon intergrades with more ornate morphotypes of its ancestor, M. velascoensis, and has no descendants. STRATIGRAPHIC RANGE.- Zone El ; restricted to Carbon Isotope Excursion (CIE) interval of Paleocene- Eocene Thermal Maximum(P ETM). GEOGRAPHIC DISTRIBUTION.- This taxon is most abundant in warm-water, (sub)tropical regions; common in central-equatorial Pacific Ocean (ODP Site 865) and in northern (Spain) and southern (Egypt) Tethyan deposits; rare occurrences recorded on Blake Ridge of North Atlantic (ODP Site 105 1). STABLE ISOTOPE PALEOBIOL0GY.- Inferred depth-habitat varies over time; initially occupied deeper portions of mixed-layer to upper thermocline and subsequently inhabited shallow mixed-layer; carbon isotope signature exhibits strong covariance with shell size, while oxygen isotope composition displays a modest negative correlation with shell size (overall stable isotopic signature is analogous to that of modern, symbiotic species) (Kelly and others, 1998). |
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| Systematics: | ||||||
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35 Ordo Foraminiferida Superfamilia Globigerinaceae Familia Truncorotaloididae Genus Morozovella Species Morozovella allisonensis |
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| Synonym list: | ||||||
| Pearson et al. (2006): 1996 Morozovella allisonensis Kelly et al.. - Kelly et al. : p.424 fig. 2.7a-2.7b (nomen nudum); [Zone P5 (from a part equivalent to Zone E1 in
this work, from within carbon isotope excursion of
Paleocene-Eocene Thermal Maximum), ODP Hole 865C
Allison Guyot, equatorial Pacific Ocean].
1998 Morozovella allisonensis Kelly et al.. - Kelly et al. : p.158 fig. 5A [holotype], 5B [paratype];
fig. 8D-G [Zone P5; (from a part equivalent to Zone El in this work,
from within carbon isotope excursion of Paleocene-Eocene
Thermal Maximum), ODP Hole 865C Allison Guyot,
equatorial Pacific Ocean].
2006 Morozovella allisonensis Kelly et al.. - Pearson et al. : p.348 pl. 11.2; fig. 4-16 (Pl. 11.2, Figs. 4-8, 12: SEMs of holotype and
paratype of Morozovella allisonensis Kelly, Bralower,
and Zachos)
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| Specimen: | ||||||
| Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 494824 Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 494825 |
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| References: | ||||||
Kelly,D.C.; Bralower,T.J.; Zachos,J.C.; Premoli Silva,I. and Thomas,E. (1996): Kelly,.; Bralower,. and Zachos,. (1998): 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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