Morozovella subbotinae


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Morozovella -> Morozovella subbotinae
Sister taxa: M. caucasica, M. crater, M. aragonensis, M. lensiformis, M. subbotinae, M. marginodentata, M. formosa, M. gracilis, M. aequa, M. apanthesma, M. angulata, M. praeangulata, M. edgari, M. allisonensis, M. velascoensis, M. acuta, M. occlusa, M. pasionensis, M. acutispira, M. conicotruncata, M. sp.,

Taxonomy

Citation: Morozovella subbotinae (Morozova 1939)
Rank: Species
Basionym: Morozovella
Synonyms:
Taxonomic discussion: This robust morphospecies is a characteristic element of latest Paleocene and early Eocene planktonic foraminiferal assemblages. Morozovella subbotinae has had a convoluted taxonomic history. It is generally agreed by specialists that Globorotalia subbotinae Morozova, 1939 is a senior synonym of Globorotalia rex Martin, 1943 (see Berggren, 1977; Blow, 1979 for discussions). In the (former) Soviet Union this taxon was identified with (the middle Eocene) Globorotalia crassata Cushman, 1925 (see our treatment in Pearson and Berggren, Chapter 10, this volume; see also Subbotina, 1947, p. 119-121; 1, p. 211). Included in this taxon subsequently by Subbotina (1953) were forms referable to M. aequa and M. subbotinae (including the holotype reference of Morozova, 1939, of G. subbotinae) as well as forms (1947, pl. 9, figs. 15-17) subsequently (1953, pl. 18, figs. 1a-c) referred to the new taxon Globorotalia marginodentata Subbotina, 1953. Examination of a suite of specimens identified as G. crassata donated to one of us (WAB) in 1962 by Subbotina bears this out.
An enigmatic case of taxonomic affinities is provided by Globorotalia nartanensis Shutskaya, 1956. The (relatively poor) illustration of the holotype is balanced by a clear and thorough description of the taxon. The low, biconvex test, thick, blunt “spines” (=muricae) on the test surface which give the test the appearance of having a thick, “granular” test wall and the transitional characters to M. aragonensis noted by Shutskaya (1956) make it quite clear that this taxon, in its original concept, is a junior synonym of Globorotalia lensiformis Subbotina, 1953. However, Shutskaya (1972b) subsequently illustrated two morphotypes identified as G. nartanensis from the G. subbotinae Zone of the south west Crimea which are virtually identical with Subbotina’s (1953, pl. 17, figs. 13a-c) illustrations of a peripherally compressed test with development of a frilled (“marginodentate”) keel which she considered transitional between Globorotalia crassata ( =G. aequa/ subbotinae) and G. marginodentata.
Blow (1979, p. 1018-1026) has drawn attention to the close similarities between M. subbotinae (Morozova), M. marginodentata (Subbotina) and M. gracilis (Bolli). In fact he considered gracilis separated from subbotinae at the subspecies level based on the increase in chamber number (from 4½ in subbotinae to 5½-6 in gracilis), associated with the development of a
somewhat more evolute coiling-mode and more vorticiform spiral intercameral sutures in gracilis and, finally, the slightly different (shorter) stratigraphic range of gracilis. The development of a strongly dentate (fimbriate) muricocarina (marginodentata) on some morphotypes was considered little more than ecophenotypic variation within the subbotinae plexus of morphotypes, indicative of high productivity, and marginodentata was, accordingly, considered only a variant of subbotinae (cf. Berggren, 1971, who had suggested earlier that marginodentata might be synonymous with, or an ecophenotypic variant of, gracilis). [Berggren & Pearson 2006]

Catalog entries: Globorotalia bollii;
Globorotalia nartanensis;
Globorotalia rex;
Globorotalia subbotinae;

Type images:

Distinguishing features: Morozovella subbotinae is distinguished by its relatively large and strongly muricocarinate test, and the circumumbilical elevation/extension of the chambers and weakly ornamented circumumbilical chamber tips.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: Morozovella subbotinae is distinguished by its relatively large and strongly muricocarinate test, and the circumumbilical elevation/extension of the chambers and weakly ornamented circumumbilical chamber tips.
[Berggren & Pearson 2006]

Wall type: Normal perforate, muricate, nonspinose. [Berggren & Pearson 2006]

Test morphology: Test relatively large (to 0.5 mm maximum diameter), planoconvex to weakly biconvex test with moderately lobulate, strongly/thickly keeled periphery; 4-4.5 chambers in last whorl, generally covered with muricae on umbilical side, spiral side relatively smooth; umbilical and spiral intercameral sutures weakly curved, tangential on spiral side yielding trapezoidal-shaped chambers; circumumbilical chamber tips weakly ornamented by muricae and surrounding deep, narrowly open umbilicus; aperture a low, umbilical-extraumbilical slit extending almost to periphery and bordered by weak lip. [Berggren & Pearson 2006]

Size: Holotype diameter: 0.36mm; thickness: 0.20mm. [Berggren & Pearson 2006]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:-
umb chamber shape:Inflatedcoiling axis:Moderateperiphery:Single keelaperture border:Thin lip
sp chbr shape:Trapezoidalumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Moderately muricateshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Weakly depresseddiameter mm:0.36width mm:breadth mm:0.2
final-whorl chambers:4.0-4.5

Biogeography and Palaeobiology


Geographic distribution: Widely distributed in (sub)tropical assemblages in Atlantic, Indo-Pacific, and typical Tethyan biogeographies and as far south as 60o S in association with the early Eocene extra-tropical excursion of carinate morozovellids on the Kerguelen Plateau (Huber, 1991, ODP Site 738; Berggren, 1992, ODP Site 747; see also Olsson and others, 1999, p. 67, text-figure 24). [Berggren & Pearson 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (1999)

Isotope paleobiology: Morozovella subbotinae has ∂13C and ∂18O values similar to M. velascoensis and Acarinina nitida and has more positive ∂13C and ∂18O than Subbotina triangularis (D’Hondt and others, 1994). Morozovella subbotinae displays a pronounced increase in ∂13C with increased test size but little corresponding change in ∂18O (D’Hondt and others, 1994). [Berggren & Pearson 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): D'hondt et al. (1994)

Phylogenetic relations: This taxon evolved from M. aequa by an increase in test size, developing a thicker, broader peripheral muricocarina and more pronounced angulo-conical test; it evolved into M. lensiformis and also gave rise to M. marginodentata and M. gracilis. [Berggren & Pearson 2006]

Most likely ancestor: Morozovella aequa - at confidence level 4 (out of 5). Data source: Berggren & Pearson (2006) f11.1.

Biostratigraphic distribution

Geological Range:
Notes: Zone P5 to Zone E5. We have found that M. subbotinae has its FAD at the top of Chron C25n at ODP Site 577 and has a short overlap in the upper part of its range with Morozovella aragonensis. Its LAD is used to denote the boundary between Zones E5 and E6 here. The premature disappearance of M. subbotinae (within Zone P6b = E4) at Indian Ocean Site 213 is ascribed to gradually increasing dissolution in the early Eocene. [Berggren & Pearson 2006]
The LAD of Morozovella subbotinae marks the base of zone E6 / top of E5 (Wade et al. 2011)
Last occurrence (top): at top of E5 zone (100% up, 50.7Ma, in Ypresian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): at base of P5 zone (0% up, 57.1Ma, in Thanetian stage). Data source: Berggren & Pearson (2006) f11.1

Plot of occurrence data:

Primary source for this page: Berggren & Pearson 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 11, p. 370

References:

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Morozovella subbotinae compiled by the pforams@mikrotax project team viewed: 25-6-2018

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