pforams@mikrotax - Morozovella velascoensis

Citation: Morozovella velascoensis (Cushman 1925)

Basionym: Pulvinulina velascoensis

Synonyms:

Pulvinulina velascoensis Cushman, 1925:19, pl. 3: fig. 5a-c [Velasco Fm., San Luis Potosi, Tampico Embayment, eastern Mexico],
Globorotalia velascoensis (Cushman).—White, 1928:281, pl. 38: fig. 2a-c [Velasco Shale Fm., eastern Mexico].—Cushman and Renz, 1946:47, pl. 8: figs. 13, 14 [lower Lizard Springs Fm., Trinidad], —Subbotina, 1947:123, pl. 7: figs. 9-11 [Globorotalia velascoensis Zone, Sunzha River section, northern Caucasus], pl. 9: figs. 21-23 [Globorotalia velascoensis Zone, Kuban River section, northern Caucasus].—Le Roy, 1953:33, pl. 3: figs. 1-3 [Maqfi section, Egypt].—Haque, 1956:181, pl. 24: fig. 2a-c [upper Paleocene, Nammal Gorge, Salt Range, Pakistan],—Bolli, I957a:76, pl. 20: figs. 1-4 [Globorotalia pseudomenardii Zone, lower Lizard Springs Fm., Trinidad].—Loeblich and Tappan, 1957a:196, pl. 64: figs. la-2c [Zone P4, Velasco Fm., Tamaulipas, Mexico],—Bolli and Cita, 1960:391, pl. 35: fig. 7a-c [Globorotalia pseudomenardii Zone, Pademo d'Adda section, northern Italy].—Said and Kerdany, 1961:330, pl. 1: fig. lOa-c [lower Esna Shale Fm„ Western Desert, Egypt]. —Shutskaya, 1970b: 118-120, pl. 23: fig. 3a-c, pl. 24: fig. 5a-c [Acarinina tadjikistanensis djanensis Subzone, Kachan Stage, Tarkhankut Peninsula, Crimea, Olenev Platform, Boring 210, 517-527 m], pl. 25: fig. 5a-c [same zone as above, but from boring 229, 637-641 m], pl. 27: fig. 12a-c [Acarinina acarinata Zone, Kachan Stage, Tarkhankut Peninsula, Crimea], pl. 29: fig. 8a-c [Globorotalia aequa Zone, Bakhchissarayan Stage, Tarkhankut Peninsula, Crimea].—Luterbacher, 1975a:726, pl. 1: fig. 8a,b [Globorotalia pseudomenardii Zone, DSDP Site 305/14/1: 135-138 cm; Shatsky Rise, northwestern Pacific Ocean].—Pujol, 1983:644, pl. 3: fig. 9 [Zone P5, DSDP Hole 516F/84/5: 13-15 cm; Rio Grande Rise, southwestern Atlantic Ocean],
Pseudogloborotalia velascoensis (Cushman).—Bermudez, 1961:1349, pl. 16: fig. 1 la,b [Velasco Station, Tampico-San Luis Potosi Railway, Mexico].
Globorotalia (Truncorotalia) velascoensis velascoensis (Cushman). Hillebrandt, 1962:169, pl. 13: figs. 16-21 [Zone D = Globorotalia pusilla pusilla Zone (upper part), Reichenhall-Salzburg Basin, Austro-German border],
Truncorotaloides (Morozovella) velascoensis (Cushman).—McGowran, 1968:190, pl. 2: fig. 1 [Velasco Fm., Ebano, Mexico).
Globorotalia (Morozovella) velascoensis velascoensis (Cushman).—Jenkins, 1971:107, pl. 9: figs. 214-216 [Globigerina triloculinoides Zone, Waipawan Stage, Middle Waipara River section, New Zealand],—Blow, 1979:1029, pl. 92: fig. 7 [Zone P4, DSDP Hole 47.2/9/3: 70-72 cm; Shatsky Rise, northwestern Pacific Ocean], pl. 94: figs. 6-9, pl. 95: figs. 1,2, pl. 216: figs. 1-8, pl. 217: figs. 1-6 [Zone P5, Samples FCRM. 1670, Lindi area, Tanzania], pl. 99: figs. 3, 4 [Zone P5, DSDP Hole 47.2/9/1: 64-66 cm; Shatsky Rise, northwestern Pacific Ocean].—Belford, 1984:10, pl. 1: fig. 2, pl. 19: figs. 1-12 [upper Paleocene, Wabag Sheet area, Papua, New Guinea].
Morozovella velascoensis (Cushman).—Toumarkine and Luterbacher, 1985:109, text-figs. 11, 12 [fig. 11: reillustration of Bolli, 1957a, pl. 20: figs. 1-3; fig. 12: reillustration of holotype from Cushman, 1925, pl. 3, fig. 5a-c]. [Olsson et al. 1999]

Taxonomic discussion: This is the type species of the genus Morozovella McGowran (in Luterbacher, 1964) and one of the most characteristic and easily recognized Paleocene morozovellids. It has been assigned to various genera and subgenera over the past half century but would appear to have found a suitable home in the genus Morozovella as defined by McGowran in Luterbacher (1964; see also McGowran, 1968).
This species has been confused with the heterochronously isomorphic form M. caucasica (Glaessner) (see Subbotina, 1953, pl. 19: figs. la-2c, who identified strongly muricocarinate and circumumbilically muricate forms from the lower Eocene zone of conical globorotaliids of the northern Caucasus as G. velascoensis; see also El-Naggar, 1966, who was equally confused by the distinctions between these two taxa, and Blow, 1979, for clarification of the problems associated with separation and recognition of these two forms). [Olsson et al. 1999]

Distinguishing features:
Parent taxon (Morozovella): Test typically plano-convex, chambers strongly anguloconical.
Wall strongly pustulose (muricate) on parts of spire and umbilicus. Most species with muricocarina.
This taxon: Like M. conicotruncata but with coarsely muricate adumbilical ridges and muricocarina; and complete loss of muricae on the chamber surfaces.

Description

Biogeography and Palaeobiology

Morozovella velascoensis has a wide geographic distribution but is a predominantly (sub)tropical to temperate form; it has not been recorded from high northern or southern (subantarctic) latitudes (> 45° N or S). The disappearance of this taxon is a distinct biostratigraphic event that is used to define the boundary between Zones P5 and
P6, which occurs in mid-Chron C24r, and is closely correlative with the Paleocene/Eocene boundary as denoted in the Belgian and/or London-Hampshire Basin(s) of northwestern Europe (Berggren and Aubry, 1996) (Figure 25). [Olsson et al. 1999]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (1999)

Morozovella velascoensis has ∂13C similar to coexisting species of Morozovella and Acarinina and more positive ∂13C and more negative ∂18O than Subbotina (Boersma and Premoli Silva, 1983; Shackleton et al., 1985; D'Hondt et al., 1994). Morozovella velascoensis displays a pronounced increase in 8UC with increased test size but little corresponding change in ∂18O (D'Hondt et al., 1994). This species typically has more negative ∂18O than all other analyzed species of Morozovella (Berggren and Norris, 1997). [Olsson et al. 1999]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy _¹³C and relatively light _¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Berggren & Norris (1997)

This species evolved from Morozovella conicotruncata (Subbotina) within Subzone P3b by the acquisition of coarsely muricate adumbilical ridges, the complete loss of muricae on the spiral chamber surfaces and between the muricocarina and umbilical collar, as well as the formation of a thick, coarsely muricate muricocarina. [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Zone P3b to Zone P5 (top). [Olsson et al. 1999]
The LAD of Morozovella velascoensis marks the base of zone E3 / top of E2 (Wade et al. 2011)
Last occurrence (top): at top of E2 zone (100% up, 55.2Ma, in Ypresian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): near base of P3b subzone (10% up, 61.3Ma, in Selandian stage). Data source: Olsson et al. 1999

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 66

References:

Berggren, W. A. & Pearson, P. N. (2006a). Taxonomy, biostratigraphy, and phylogeny of Eocene Morozovella. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 11): 343-376. gs O

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Cushman, J. A. (1925e). Some new foraminifera from the Velasco shale of Mexico. Contributions from the Cushman Laboratory for Foraminiferal Research. 1(1): 18-23. gs

El-Naggar, Z. R. (1966). Stratigraphy and planktonic foraminifera of the Upper Cretaceous-Lower Tertiary succession in the Esna-Idfu region, Nile Valley, Egypt, U. A. R. Bulletin of the British Museum (Natural History). supplement 2: 1-291. gs

Luterbacher, H. P. (1964). Studies in some Globorotalia from the Paleocene and Lower Eocene of the Central Apennines. Eclogae Geologicae Helvetiae. 57: 631-730. gs O

McGowran, B. J. (1968). Reclassification of Early Tertiary Globorotalia. Micropaleontology. 14: 179-198. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs

Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs

Comments (2)

Le Coze

Hello,

In the Biostratigraphic distribution, Taxon plotted, Subbotina velascoensis is mentionned but it is a different species (= Globigerina velascoensis Cushman, 1925 not Pulvinulina velascoensis Cushman, 1925).

Best,

François

25 August 2018 21:05

Jeremy Young(UK)

Hi Francois - thank you very much, and well spotted.

Jeremy

6 September 2018 23:14

test outline:	Subcircular	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	High	periphery:	Muricocarinate	aperture border:	Thin flange
umb chbr shape:	Subtriangular	umbilicus:	Narrow	periph margin shape:	Subangular	accessory apertures:	None
spiral sutures:	Raised muricate	umb depth:	Deep	wall texture:	Spinose	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	6.5-7.5	N.B. These characters are used for advanced search. N/A - not applicable

Morozovella velascoensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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Comments (2)