pforams@mikrotax - Praemurica uncinata

Citation: Praemurica uncinata (Bolli 1957)

Synonyms:

Globorotalia uncinata Bolli, 1957a:74, pl. 17: figs. 13-15 [Globorotalia uncinata Zone, lower Lizard Springs Fm., Trinidad].—Luterbacher, 1964:655, 657, fig. 30a-c [Globorotalia uncinata Zone, level G-85, Gubbio section, centTal Apennines, Italy], fig. 3 l a - c [topotype, Trinidad].—Said and Sabry, 1964:385, 386, pl. 1: fig. 12a-c [Globorotalia uncinata Zone, Esna Shale, Gebel Aweina, Egypt],—Berggren, 1965:294, text-fig. 9 (5a-c) [Globorotalia uncinata Zone, Mexia Clay Mbr., Wills Point Fm., Mexia, Texas],—Toumarkine, 1978:692, 693, pl. 1: fig. 16 [Globorotalia uncinata Zone, DSDP Site 363/17/1: 87-89 cm; Walvis Ridge, South Atlantic Ocean],—Pujol, 1983:645, 652, pl. 2: fig. 1 [Globorotalia uncinata Zone, DSDP Hole 516F/87/7: 39-40 cm; Rio Grande Rise, South Atlantic Ocean].
Acarinina indolensis Morozova, 1959:1116, text-fig. 1 [Danian, Globoconusa daubjergensislAcarinina indolensis Zone, northwestern Crimea],
Globorotalia uncinata uncinata Bolli.—El-Naggar, 1966:240, pl. 18: fig. la-c, pl. 19: fig. 2a-c [samples S.34 and S.36, respectively, bothGloborotalia uncinata Zone, lower Esna Shale, Gebel Oweina, Egypt].
Acarinina inconstans uncinata (Bolli). —Shutskaya, 1970a: 110, pl. 6: fig. la-c [holotype refigured], fig. 2a-c [middle part of Acarinina inconstans Zone, Elburgan Fm., Kuban River, northern Caucasus], fig. 3a-c [lower part of Globigerina trivialis -Globoconusa daubjergensis -Globorotalia compressa Zone, northern Osetiya, Urukh River, northern Caucasus]; 1970b: 118-120, pl. 19: figs. 7a-c, lOa-c [Acarinina inconstans Zone, Elburgan Fm., Kuban River, Cherkessk region, northern Caucasus],
Globorotalia (Acarinina) praecursoria praecursoria ( Morozova).—Blow, 1979:944-947, pl. 76: figs. 4, 8, 9, pl. 81: fig. 3 [Zone P2, DSDP Hole 47.2/10/5: 70-72 cm], pl. 77: figs. 2-5 [Zone P2, DSDP Hole 20C/6/4: 72-74 cm; Brazil Basin, South Atlantic Ocean], pl. 82: figs. 1-3 [Zone P2, recollection of Globorotalia uncinata type locality, Trinidad], pl. 84:fig.2, pl. 85: fig. 9 [Zone P3, DSDP Hole 47.2/10/2: 80-82 cm; Shatsky Rise, northwestern Pacific Ocean], [Not Morozova, 1961.]
Morozovella uncinata (Bolli).—Snyder and Waters, 1985:448,449, pl. 10: figs. 1, 2 [Globorotalia uncinata Zone, DSDP Site 550/37/5: 59-61 cm; Porcupine Abyssal Plain, northeastern Atlantic Ocean], [Olsson et al. 1999]

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]

Distinguishing features:
Parent taxon (Praemurica): Test very low trochospiral, usually 5-6, globular to oval chambers in last whorl, periphery lobulate;
Wall non-spinose, weakly cancellate;
This taxon: 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

Description

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]

Biogeography and Palaeobiology

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)

Praemurica uncinata has more positive δ13C and more negative δ18O 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 δ13C 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 _¹³C lighter than species with symbionts; also with relatively light _¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Berggren & Norris (1997); Shackleton et al. (1985)

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]

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 Danian 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)

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). 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

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. (85): 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(3): 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 Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 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 Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 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

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Inflated	coiling axis:	Low	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Inflated	umbilicus:	Narrow	periph margin shape:	Moderately rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	5-8	N.B. These characters are used for advanced search. N/A - not applicable

Praemurica uncinata

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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