Morozovellataurica ( Morozova).—Berggren, 1992:564, pl. 1: figs. 9-11 [Danian, ODP Hole 747C/3H/2: 22-24 cm; Kerguelen Plateau, southern Indian Ocean],
Praemuricataurica ( Morozova).—Olsson, Hemleben, Berggren, and Liu, 1992:202, pl. 5: figs. 1-8 [Zone Pla, Pine Barren Mbr., Clayton Fm., Millers Ferry, Alabama]. [Olsson et al. 1999]
Taxonomic discussion: This is the first species of Praemurica to evolve from Hedbergellamonmouthensis 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 Neogloboquadrinadutertrei. Praemuricataurica is a stem form of an important lineage leading to P. uncinata. [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: 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.
Description
Diagnostic characters: The species is characterized by a very low trochospiral test with 5-6, occasionally more chambers in the ultimate whorl. The globular to slightly ovoid chambers increase very gradually in size with the last one or two occasionally slightly shifted towards the umbilicus. The umbilical-extraumbilical aperture is a low to high arch bordered by a narrow lip which broadens towards the umbilicus and becomes somewhat triangular in shape. In well preserved specimens the lips from previous chambers project as small flaps into a fairly wide and broad umbilicus which has a deep depression. The cancellate structure is weakly developed. [Olsson et al. 1999]
Character matrix
test outline:
Subcircular
chamber arrangement:
Trochospiral
edge view:
Equally biconvex
aperture:
Umbilical-extraumbilical
sp chamber shape:
Inflated
coiling axis:
Low
periphery:
N/A
aperture border:
Thin lip
umb chbr shape:
Inflated
umbilicus:
Narrow
periph margin shape:
Broadly rounded
accessory apertures:
None
spiral sutures:
Strongly depressed
umb depth:
Shallow
wall texture:
Smooth
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Strongly depressed
final-whorl chambers:
5-6
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Geographic distributionWorldwide 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 paleobiologyPraemuricataurica 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 relationsThis species evolved from Hedbergellamonmouthensis 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]
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:
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
Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 75
References:
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. (2): 8-19. gsO
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. (85): 1-252. gs
Praemurica taurica compiled by the pforams@mikrotax project teamviewed: 8-3-2026
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Olsson_etal_99_pl61_f05_f08_f10.jpg
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Olsson_etal_99_pl61_f07_f09.jpg
Olsson_etal_99_pl61_f11_f12_f15.jpg
Olsson_etal_99_pl61_f05_f08_f10.jpg
Olsson_etal_99_pl61_f01-4.jpg
Olsson_etal_99_pl61_f06.jpg
Olsson_etal_99_pl61_f07_f09.jpg/Globigerina (Eoglobigerina) taurica/Olsson_etal_99_pl10_f01-3.jpg)
holotype: G. (Eoglobigerina) taurica/Globigerina (Eoglobigerina) taurica/Morozova 1961 Danian pl1 f5.JPG)
x: G. (Eoglobigerina) taurica
