pforams@mikrotax - Praemurica pforams@mikrotax - Praemurica


Classification: pf_cenozoic -> Truncorotaloididae -> Praemurica
Sister taxa: Alicantina, Acarinina, Praemurica ⟩⟨ Igorina, Pearsonites, Planorotalites, Astrorotalia ⟩⟨ Morozovella, Morozovelloides
Daughter taxa (time control age-window is: 0-800Ma)
Praemurica uncinata
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
Praemurica inconstans
5-7 chambered test; rapidly expanding final whorl; sutures radial; aperture an interiomarginal, umbilical-extraumbilical slit with distinct lipped rim.
Praemurica pseudoinconstans
Like P. taurica but with increased rate of expansion of the final few chambers; also apertural lip less pronounced.
Praemurica taurica
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. 
Praemurica nikolasi
Very small trochospiral test, 4½–5 subglobular chambers in the last whorl; equatorial periphery lobate; ; very small umbilicus; last chamber inflated, with well-developed apertural lip projecting over the umbilicus and covering most of it.
Praemurica sp.
Specimens which cannot be assigned to established species


Citation: Praemurica Olsson, Hemleben, Berggren,&Liu, 1992
taxonomic rank: Genus
Type species: Globigerina (Eoglobigerina) taurica Morozova, 1961.
Taxonomic discussion: Praemurica should probably be included in the Globigerinidae since Koutsoukos (2014) demonstrated that it was ancestral to both Eoglobigerina (and so Subbotina) and Parasubbotina. [editor's comment - JRY 2018]

The wall texture of Praemurica (Plate 6: Figures 2-4) is similar to that observed in the modern Neogloboquadrina dutertrei (d'Orbigny) (Plate 5: Figures 9, 10). Elongate subparallel ridges, often with an orientation towards the aperture, are connected by shorter less well-developed ridges that are thicker and broader on one side. This gives the test a cancellate wall texture, which is herein termed praemuricate. It is the first distinctive nonspinose, pustulose wall texture to evolve in the phylogeny of the early Paleocene planktonic foraminifera. [Olsson et al. 1999]

Catalog entries: Praemurica

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

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.


Biogeography and Palaeobiology

Most likely ancestor: Benthic foraminifera - at confidence level 3 (out of 5). Data source: Koutsoukos 2014.
Likely descendants: Eoglobigerina; Igorina; Morozovella; plot with descendants

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of P3a subzone (100% up, 61.3Ma, in Selandian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within P0 zone (66.00-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 12, p. 397


Berggren, W. A., Olsson, R. K. & Premoli Silva, I. (2006a). Taxonomy, biostratigraphy and phylogenetic affinities of Eocene Astrorotalia, Igorina, Planorotalites, and Problematica (Praemurica? lozanoi). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 12): 377-400. gs

Koutsoukos, E. (2014). Phenotypic plasticity, speciation, and phylogeny in Early Danian planktic foraminifera. Journal of Foraminiferal Research. 44: 109-142. 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


Praemurica compiled by the pforams@mikrotax project team viewed: 22-5-2024

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