pforams@mikrotax - Praemurica taurica pforams@mikrotax - Praemurica taurica

Praemurica taurica

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


Citation: Praemurica taurica (Morozova 1961)
taxonomic rank: Species
Basionym: Globigerina (Eoglobigerina) taurica
Taxonomic discussion: This is the first species of Praemurica to evolve from Hedbergella monmouthensis in the basal Danian. It is fairly commmon in Zone Pa. Although the cancellate wall texture is weakly developed, it is distinctive under SEM, being nearly identical to the living species Neogloboquadrina dutertrei. Praemurica taurica is a stem form of an important lineage leading to P. uncinata. [Olsson et al. 1999]

Catalog entries: Globigerina (Eoglobigerina) taurica

Type images:

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: Very low trochospiral test, 5-6 chambers in the ultimate whorl. Umbilicus fairly wide and broad. Aperture bordered by a narrow lip which broadens towards the umbilicus and becomes somewhat triangular in shape. 

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.


Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5-6 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Worldwide in the high to low latitudes (Figure 29). [Olsson et al. 1999]
Aze et al. 2011 summary: Cosmopolitan; based on Olsson et al. (1999)

Isotope paleobiology
Praemurica taurica has more positive δ13C and more negative δ18O than Subbotina and Globanomalina in the late Danian, but all these taxa have similar isotopic signatures in the earliest Danian (Berggren and Norris, 1997). There is a pronounced increase in δ13C with increased size in P. taurica among small specimens (up to -200 urn; D'Hondt and Zachos, 1993) but a weak trend above this size (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); D'hondt & Zachos (1993)

Phylogenetic relations
This species evolved from Hedbergella monmouthensis in late Biochron P0. It is the stem form of the praemuricate pseudoinconstans -inconstans -uncinata lineage of the lower Paleocene (Danian) Zones Pl and P2. [Olsson et al. 1999]

Most likely ancestor: Praemurica nikolasi - at confidence level 5 (out of 5). Data source: Koutsoukos 2014, p.138.
Likely descendants: Praemurica pseudoinconstans; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Upper Zone P0 to Zone Plb; ?Plc. [Olsson et al. 1999]
Last occurrence (top): in lower part of P1b subzone (30% up, 64.8Ma, in Danian stage). Data source: Olsson et al. (1999), fig. 5a
First occurrence (base): in mid part of P0 zone (50% up, 66Ma, in Danian stage). Data source: Olsson et al. (1999), fig. 5a

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 75


Berggren, W. A. (1992). Paleogene planktonic foraminifer magnetobiostratigraphy of the southern Kerguelen Plateau (sites 747-749). Proceedings of the Ocean Drilling Program, Scientific Results. 120: 551-568. gs

Morozova, V. G. (1961). Datsko-Montskie planktonnye foraminifery yuga SSSR [Danian-Montian Planktonic Foraminifera of the Southern USSR]. Paleontologicheskiy Zhurnal. 8-19. gs O

Olsson, R. K., Hemleben, C., Berggren, W. A. & Liu, C. (1992). Wall Texture Classification of planktonic foraminifera genera in the Lower Danian. Journal of Foraminiferal Research. 22(3): 195-213. 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


Praemurica taurica compiled by the pforams@mikrotax project team viewed: 25-7-2024

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