Praemurica uncinata


Classification: pf_cenozoic -> Truncorotaloididae -> Praemurica -> Praemurica uncinata
Sister taxa: P. uncinata, P. inconstans, P. pseudoinconstans, P. taurica, P. nikolasi, P. sp.,

Taxonomy

Citation: Praemurica uncinata (Bolli 1957)
Rank: Species
Basionym: Globorotalia uncinata
Synonyms:
Taxonomic discussion: Blow (1979) argued the case for including uncinata Bolli, 1957a, as a junior synonym of praecursoria Morozova, 1957. Our examination of the holotypes of both of these forms leads us to reject this interpretation. Rather, we interpret praecursoria as an advanced, atypically large end-member of inconstans that is characterized by rounded chambers and an axial periphery, and we reserve for uncinata those forms exhibiting the typical anguloconical (but noncarinate) test with distinctly incised and recurved spiral inter-cameral sutures. Acarinina indolensis Morozova (1959) is a small form of P. uncinata with five chambers in the final whorl but, nevertheless, exhibits the characteristic morphology of this species. [Olsson et al. 1999]

Catalog entries: Globorotalia uncinata, Acarinina indolensis

Type images:

Distinguishing features: Plano-convex to moderately high spired, moderately lobulate test, 5-8 chambers in final whorl; sutures on spiral side incised and strongly recurved; axial periphery subangular, with rugose muricae; umbilicus typically narrow and deep

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


Diagnostic characters: Non-spinose, weakly cancellate, elongate-oval, plano-convex to moderately high spired, moderately lobulate test with 5-8 chambers in last whorl; chambers occasionally so loosely coiled as to form secondary spiral apertures between them; sutures on umbilical side radial, depressed, on spiral side incised and strongly recurved yielding typically trapezoidal shaped chambers; axial periphery subangular, noncarinate but with rugose muricae often situated along peripheral margin of early chambers of last whorl; umbilicus typically narrow, deep and bordered by weakly developed circumumbilical shoulder formed by raised periumbilical chamber extensions; aperture a narrow interiomarginal, umbilical-extraumbilical arch extending to the peripheral margin. [Olsson et al. 1999]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: This taxon has been widely
reported in the literature from predominantly low latitude (sub)tropical localities. Shutskaya (1970a, 1970b) recorded it from several localities in the northern Caucasus. This species does not appear to occur in high southern latitudes (Stott and Kennett, 1990; Huber, 1991b), and we have not found it in our examination of material from the southern part of the Indian Ocean (Figure 30). [Olsson et al. 1999]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (1999)

Isotope paleobiology: Praemurica uncinata has more positive ∂13C and more negative ∂18O than Subbotina and Globanomalina and has an isotopic signature similar to that of Morozovella
praeangulata (Shackleton et al., 1985; Berggren and Norris, 1997). There is a pronounced increase in ∂13C with increased size in P. uncinata (Kelly et al., 1996; Norris, 1996). [Olsson et al. 1999]
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on δ13C lighter than species with symbionts; also with relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Berggren & Norris (1997); Shackleton et al. (1985)

Phylogenetic relations: This species evolved from Praemurica inconstans at the base of Zone P2 by extension of the umbilically conical chambers into most of the final whorl, and by the formation of blunt pustules around the umbilicus and on the initial chambers of the final whorl. [Olsson et al. 1999]

Most likely ancestor: Praemurica inconstans - at confidence level 4 (out of 5). Data source: Olsson et al. (1999), fig. 5a.
Likely descendants: Igorina pusilla; Morozovella praeangulata;

Biostratigraphic distribution

Geological Range:
Notes: Zone P2 to lower Zone P3. [Olsson et al. 1999]
The FAD of Praemurica uncinata marks the base of zone P2 / top of P1c (Wade et al. 2011)
Last occurrence (top): in lower part of P3a subzone (40% up, 61.9Ma, in Selandian stage). Data source: Olsson et al. 1999
First occurrence (base): at base of P2 zone (0% up, 62.6Ma, 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. 76

References:

Berggren, W. A. (1965). Some Problems of Paleocene-Lower Eocene Planktonic Foraminiferal Correlations. Micropaleontology. 11: 278-300. 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. (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

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) Geology. 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

Morozova, V. G. (1959). Stratigraphy of the Danian-Montian deposits of the Crimea according to the foraminifera. Doklady Akademii Nauk SSSR. 124(5): 1113-1115. 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

Pujol, C. (1983). Cenozoic planktonic foraminiferal biostratigraphy of the South-Western Atlantic (Rio Grande Rise): Deep Sea Drilling Project Leg 72. Initial Reports of the Deep Sea Drilling Project. 72: 623-673. gs

Said, R. & Sabry, H. (1964). Planktonic foraminifera from the type locality of the Esna Shale in Egypt. Micropaleontology. 10: 375-395. gs

Shutskaya, E. K. (1970a). Morphologic groups and descriptions of species of Globigerina and Acarinina in the lower Paleogene of the Crimea, the Caucasus Foreland, and western Central Asia. Trudy Instituta Vsesoyuznyy NauchnoIssledovatel'skiy Geologorazvedochnyy Neftyanot Institut. 69: 79-113. 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, Vsesoyuznyi Nauchno-lssledovadetel 'skii Geologorazvedochnyi Neftyanoi Institut (VNIGNI). 70(1): 256-. gs

Snyder, S. W. & Waters, V. J. (1985). Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur Region, Deep Sea Drilling Project Leg 80. Initial Reports of the Deep Sea Drilling Project. 80: 439-472. gs

Toumarkine, M. (1978). Planktonic foraminiferal biostratigraphy of the Paleogene of Sites 360 to 364 and the Neogene of Sites 362A, 363 and 364 Leg 40,. Initial Reports of the Deep Sea Drilling Project. 40: 679-721. 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


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Praemurica uncinata compiled by the pforams@mikrotax project team viewed: 10-12-2019

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