Morozovella angulata


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Morozovella -> Morozovella angulata
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 angulata (White 1928)
Rank: Species
Basionym: Globigerina angulata
Synonyms:
Taxonomic discussion: Blow (1979:984) drew a distinction between peripherally muricocarinate (angulata) and (putatively ancestral) non-carinate (praeangulata) morphotypes of the early angulata lineage. Following Blow (1979) in this distinction, we maintain both morphotaxa in the genus Morozovella (contra Pearson, 1993).
Considerable confusion and misidentification has surrounded this taxon, not the least because of the long (about 50 year) sequestration of the White collection at Columbia University, which ended with its rediscovery by T Saito and its subsequent transfer to the American Museum of Natural History in the early 1980s. We have followed Blow (1979) in adopting the concept of angulata sensu Bolli (1957a) in identifying this form. We regard Morozovella protocarina Corfield (1989) as falling within this concept of M. angulata. Our studies, however, support the range of M. angulata given by Bolli (1957a) (Zone P3 to middle part of Zone P4) rather than that of Blow (1979) (Zone P3 to basal Zone P5). [Olsson et al. 1999]

Catalog entries: Globigerina angulata;
Morozovella protocarina;

Type images:

Distinguishing features: Muricate, nonspinose angulo-conical test, spiral side flat, early chambers slightly elevated, 10-12 chambers arranged in 2½ whorls, 4-6 chambers in final whorl, periphery lobulate, (sub)acute, imperforate band (muricocarina) developed along peripheral margin; weak circumumbilical collar formed around narrow, deep umbilicus by elevated chambers, particularly last chamber; sutures depressed, straight, radial on umbilical side, strongly recurved on spiral side; aperture, low, interiomarginal, umbilical-extraumbilical low arch with weakly developed lip.

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: Muricate, nonspinose angulo-conical test, spiral side flat, early chambers slightly elevated, 10-12 chambers arranged in 2½ whorls, 4-6 chambers in final whorl, periphery lobulate, (sub)acute, imperforate band (muricocarina) developed along peripheral margin; weak circumumbilical collar formed around narrow, deep umbilicus by elevated chambers, particularly last chamber; sutures depressed, straight, radial on umbilical side, strongly recurved on spiral side; aperture, low, interiomarginal, umbilical-extraumbilical low arch with weakly developed lip. [Olsson et al. 1999]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Interiomarginal
umb chamber shape:Subtriangularcoiling axis:Highperiphery:Muricocarinateaperture border:Thin lip
sp chbr shape:Crescenticumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
umbilical or test sutures:Strongly depressedumb depth:Deepwall texture:Spinoseshell porosity:-
spiral sutures:Raised muricatediameter mm:width mm:-breadth mm:-
final-whorl chambers:4.0-5.0

Biogeography and Palaeobiology


Geographic distribution: This form is essentially restricted to (sub)tropical to temperate regions (circumscribed by 50°N and S latitudes); it has not been reliably reported from high northern or southern (subantarctic) regions (Figure 23). [Olsson et al. 1999]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (1999)

Isotope paleobiology: Morozovella angulata has more negative ∂18O and more positive ∂13C than Parasubbotina and Subbotina (Douglas and Savin, 1978; Boersma and Premoli Silva, 1983; Shackleton et al., 1985). The species displays a distinct trend toward increased ∂13C with increased test size and little or no trend in ∂18O with size (Shackleton et al., 1985). [Olsson et al. 1999]
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): Douglas & Savin (1978); Boersma & Premoli Silva (1983); Shackleton et al. (1985)

Phylogenetic relations: This species evolved from Morozovella praeangulata (Blow) at or near the Zone P2/3 transition by elaboration of the muricae, development of a peripheral muricocarina, and establishment of anguloconical chambers throughout the last whorl. [Olsson et al. 1999]

Most likely ancestor: Morozovella praeangulata - at confidence level 4 (out of 5). Data source: Olsson et al. (1999) f5a.

Biostratigraphic distribution

Geological Range:
Notes: Zone P3 to lower Zone P4. [Olsson et al. 1999]
The FAD of Morozovella angulata marks the base of zone P3a / top of P2 (Wade et al. 2011)
Last occurrence (top): at top of P4 zone (100% up, 57.1Ma, in Thanetian stage). Data source: Olsson et al. (1999) f5a
First occurrence (base): at base of P3 zone (0% up, 62.3Ma, in Danian stage). Data source: zonal marker (Wade et al. 2011)

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 58

References:

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

Bolli, H.M. & Cita, M.B., (1960). Globigerine e Globorotalie del Paleocene di Paderno d'Adda (Italia). Rivista Italiana di Paleontologgia e Stratigrafia, LXVI(3): 1-42.

Bolli, H.M., (1957). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 61-82.

Bykova, N.K., (1953). Фораминиферы сузакского яруса Таджикской депрессии [Foraminifera of the Suzakian Stage of the Tajik depression]. Microfauna of the USSR, Proceedings of the Oil Research Geological Institute (VNIGRI). 69(6): 3-114.

Corfield, R.M., (1989). Morozovella protocarina: a new species of Palaeocene planktonic Foraminiferida. Journal of Micropalaeontology, 8: 97-102.

Glaessner, M.F., (1937). Studien über foraminiferen aus der kreide und dem Tertiär des Kaukasus. I. Die foraminiferen der ältesten Tertiärschichten des Nordwest-Kaukasus. Problemy Paleontologii, Paleontologicheskay Laboratoriya Moskovskogo Gosudarstvennogo Universiteta, 2-3: 349-410.

Hillebrandt von, A., (1962). Das Paleozän und seine Foraminiferenfauna im Becken von Reichenhall und Salzburg. Bayerische Akademie der Wissenschaften Mathematisch-Naturwissenschaftliche Klasse, Abhandlungen, Neue Folge, 108: 1-182.

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

Olsson, R.K., (1960). Foraminifera of late Cretaceous and earliest Tertiary age in the New Jersey Coastal Plain. Journal of Paleontology, 34(1): 1-58.

Olsson, R.K.; Hemleben, C.; Berggren, W.A. & Huber, B.T., (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Contributions to Paleobiology, 85. Smithsonian Institution Press, Washington, DC, 1-252 pp.

Shutskaya, E.K., (1956). Stratigraphy of the lower horizons of the Paleogene of the central Precaucasus according to the foraminifera. Akad Nauk SSSR, Inst Geol Nauk, Trudy, vypusk 164, Geol. Ser., 71: 3-119.

Toumarkine, M. & Luterbacher, H., (1985). Paleocene and Eocene planktic foraminifera. Plankton Stratigraphy. Cambridge Univ. Press, Cambridge, 87-154 pp.

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.

White, M.P., (1928). Some Index Foraminifera of the Tampico Embayment Area of Mexico. Journal of Paleontology, 2(3): 177-215.


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Morozovella angulata compiled by the pforams@mikrotax project team viewed: 22-7-2018

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