pforams@mikrotax - Morozovella conicotruncata

pforams@mikrotax - Morozovella conicotruncata pforams@mikrotax - Morozovella conicotruncata

Morozovella conicotruncata

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

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Taxonomy

Citation: Morozovella conicotruncata (Subbotina 1947)

taxonomic rank: Species

Basionym: Globorotalia conicotruncata

Synonyms:

Globorotalia conicotruncata Subbotina, 1947:115, pl. 4: figs. 11-13 [holotype, zone of "Danian Foraminifera," Assu River section, northern Caucasus], pl. 9: figs. 9-11 [zone of "Danian Foraminifera," Khieu River section, Nal'chik, northern Caucasus],—Luterbacher, 1964:660, text-fig. 40 [zone of rotalid globorotaliids, Khieu River section, northern Caucasus], text-figs. 41, 42 [as G. angulata abundocamerata: topotypes from Globorotalia pusilla pusilla Zone, lower Lizard Springs Fm., Trinidad], text-figs. 46-49 [Globorotalia pseudomenardii Zone], text-fig. 51 [Globorotalia pusilla pusilla Zone, Gubbio section, central Apennines, Italy]; 1975a:726, pl. 1: figs. 6, 7 [Globorotalia pusilla pusilla Zone, DSDP Site 305/14/CC; Shatsky Rise, northwestern Pacific Ocean],—Pujol. 1983:645, pl. 2: fig. 8 [Zone P3 (mid-part), DSDP Hole 516F/87/4: 43-44 cm; Rio Grande Rise, South Atlantic Ocean],
Acarinina conicotruncata (Subbotina). —Subbotina, 1953:220. pl. 20:fig.5a,b [zone of rotalid globorotaliids, Foraminiferal Beds, Suite Fl (lower part), Khieu River, Nal'chik, northern Caucasus], pl. 20: fig. 6a-c [holotype reillustrated], pl. 20: fig. 7a-c [specimen reillustrated from Subbotina, 1947, pl. 9: figs. 9-11, same sample as holotype], pl. 20: fig. 8a-c [same sample as fig. 7a-c] [in part, not pl. 20: figs. 10a-12c].
Globorotalia angulata (White) var. kubanensis Shutskaya, 1956:93, pl. 3: fig. 4a-c [holotype No. 3525/19, GAN, Bed 6, Marl, Elburgan Fm., Kuban River Section, northern Caucasus].
Globorotalia angulata abundocamerata Bolli, 1957a:74, pl. 17: figs. 4-6 [Globorotalia pusilla pusilla Zone, lower Lizard Springs Fm., Trinidad].— Bolli and Cita, 1960:379, pl. 35: figs. 6a-c [Globorotalia pusilla pusilla Zone, Pademo d'Adda section, northern Italy].
Globorotalia (Truncorotalia) angulata (White) - Hillebrandt, 1962:131, pl. 13: figs. 14a-15c [Zone D = correlative with upper part of Globorotalia pusilla pusilla Zone, Reichenhall-Salzburg Basin, Austro-German border]. [Not White, 1928.]
Globorotalia kubanensis (Shutskaya). —Shutskaya, 1970b: 118-120, pl. 21: fig. la-c [Acarinina praepentacamerata Zone. Malyi Balkhan Ridge, Chaal'dzhin Group, western Turkmenia].
Morozovella conicotruncata (White).—Berggren, 197lb:74, pl. 4: figs. 8, 9 [Zone P4, DSDP Hole 20C/6/5: 8-10 cm], figs. 10-14 [Zone P4, DSDP Hole 20C/6/4: 100-102 cm; Brazil Basin, South Atlantic Ocean].—Snyder and Waters, 1985:446, pl. 8: figs. 4, 5 [Zone P4/5, DSDP Site 549/16/4: 57-60 cm], fig. 6 [DSDP Site 549/16/5: 57-60 cm; northeast Atlantic Ocean].
Globorotalia (Morozovella) angulata conicotruncata (White).—Blow, 1979:986, pl. 87: fig. 3 [Zone P3, DSDP Hole 47.2/10/1: 72-74 cm; Shatsky Rise, northwestern Pacific Ocean]. [Olsson et al. 1999]

Taxonomic discussion: This is a distinct middle Paleocene planoconvex morozovellid species characterized by 5-7 equidimensional chambers in the last whorl. Our studies support Blow's (1979) observation that this form appears virtually simultaneously with typical angulata-types (cf. Bolli, 1957a); however, we do not agree with the extended range given this taxon by Blow (1979) of mid-Zone P3 through Zone P4, extending possibly into Zone P5. Our studies support, rather, the range given by Bolli (1957a) of its extension into the lower part of the Globorotalia pseudomenardii Zone. [Olsson et al. 1999]

Catalog entries: Globorotalia conicotruncata, Globorotalia angulata abundocamerata

Type images:

holotype: G. conicotruncata

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. angulata (White) but test more planoconvex; umbilucs more open; and with a low rate of chamber enlargement, and so (5-7) equidimensional chambers in the final whorl.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description

Character matrix
test outline: Lobate chamber arrangement: Trochospiral edge view: Planoconvex aperture: Umbilical-extraumbilical
sp chamber shape: Crescentic coiling axis: Moderate-high periphery: Muricocarinate aperture border: N/A
umb chbr shape: Subtriangular umbilicus: Wide periph margin shape: Subangular accessory apertures: None
spiral sutures: Weakly depressed umb depth: Deep wall texture: Moderately pustulose shell porosity: Finely Perforate: 1-2.5µm
umbilical or test sutures: Strongly depressed final-whorl chambers: 4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

As with its closely related sister taxon angulata, this form has a predominantly tropical to temperate distribution (< 45° N and S) and has not been reliably reported from high northern or southern (subantarctic) latitudes. It is a common and distinct form in our material and is observed to grade into M. velascoensis in Subzone P3b. [Olsson et al. 1999]
Aze et al. 2011 summary: Low latitudes; based on Olsson et al. (1999)

Isotope paleobiology

Morozovella conicotruncata has δ13C similar to M. angulata and more positive than Subbotina and Globanomalina (Boersma and Premoli Silva, 1983; Berggren and Norris, 1997). The δ18O of M. conicotruncata is slightly lighter than M. angulata in samples from DSDP Site 384 (Berggren and Norris, 1997) and is distinctly lighter than coexisting Globanomalina and Subbotina (Boersma and Premoli Silva, 1983; 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): Boersma & Premoli Silva (1983); Berggren & Norris (1997)

Phylogenetic relations

This morphospecies evolved from Morozovella angulata (White) in the lower part of Zone P3 by the development of a distinctly planoconvex test, a more open umbilicus than M. angulata, and a characteristic low rate of chamber enlargement, which results in equidimensional chambers throughout the final whorl. [Olsson et al. 1999]

Most likely ancestor: Morozovella angulata - at confidence level 4 (out of 5). Data source: Olsson et al. (1999) f5a.
Likely descendants: Morozovella velascoensis; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Zone P3 to lower Zone P4. [Olsson et al. 1999]
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): near base of P3 zone (10% up, 62.1Ma, in Danian stage). Data source: Olsson et al. (1999) f5a

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Morozovella conicotruncata, synonyms included - Globorotalia angulata abundocamerata; Globorotalia conicotruncata; Morozovella abundocamerata; Morozovella angulata abundocamerata; Morozovella angulata conicotruncata; Morozovella conicotruncata; Acarinina abundocamerata;
See also space-time plot :: Samples map :: Parent: Morozovella

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 60

References:

Berggren, W. A. (1971c). Paleogene planktonic foraminiferal faunas on Legs I-IV (Atlantic Ocean) JOIDES Deep Sea Drilling Program: a synthesis. In, Farinacci, A. (ed.) Proceedings of the Second Planktonic Conference, Roma 1970. Edizioni Tecnoscienza, Rome 57-77. gs

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

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

Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 61-82. 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

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

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

Shutskaya, E. K. (1956). Стратиграфия нижних горизонтов палеогена Центрального Предкавказья по фораминиферам - Stratigraphy of the lower horizons of the Paleogene of the central Precaucasus according to the foraminifera. Maden Tetkik ve Arcana Enstitusu Yayinharindam (Mining Research and Exploration, Institute of Turkey Publ.).. 71(164): 3-119. gs

Shutskaya, E. K. (1970b). Stratigrafiya, foraminifery i paleogeografiya nizhnego paleogena Kryma, predkavkaz'ya i zapadnoi chadsti srednei azii [Stratigraphy, Foraminifera and Paleogeography of the Lower Paleogene in the Crimea, Precaucasus and the Western Part of Central Asia]. Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 70(1): 256-. gs

Subbotina, N. N. (1947). Danian and Paleogene foraminifera of the northern Caucasus. Trudy VNIGRI Mikrofauna USSR. 1947: 39-160. gs O

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

Morozovella conicotruncata compiled by the pforams@mikrotax project team viewed: 14-12-2024

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test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Moderate-high	periphery:	Muricocarinate	aperture border:	N/A
umb chbr shape:	Subtriangular	umbilicus:	Wide	periph margin shape:	Subangular	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Moderately pustulose	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	4.5-5.5	N.B. These characters are used for advanced search. N/A - not applicable