Neogloboquadrina incompta


Classification: pf_cenozoic -> Globorotaliidae -> Neogloboquadrina -> Neogloboquadrina incompta
Sister taxa: N. pachyderma, N. incompta, N. inglei ⟩⟨ N. dutertrei, N. humerosa, N. acostaensis, N. atlantica, N. sp.

Taxonomy

Citation: Neogloboquadrina incompta (Cifelli, 1961)
Rank: species
Basionym: Globigerina incompta
Synonyms:
Taxonomic discussion: The left and right coiling forms of N. pachyderma were regarded as ecophenotypes for a long period, but are now known from field observations (Brummer & Kroon 1988) and molecular genetic studies to be distinct species. N. pachyderma is the left coilng / sinistral form whilst the right coiling/dextral, warmer water form is now named N. incompta, following the reccomendation of Darling et al. (2006).

Catalog entries: Globigerina incompta, Neogloboquadrina pachyderma dextralis

Type images:

Distinguishing features: Like N. pachyderma but predominantly dextral coiling. Coiling looser and umbilicus more open than in N. pachyderma.

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


Morphology:

Coiling direction (in extant population): dextral


Size: >150µm

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution:

In modern oceans an abundant, cold water, species [SCOR WG138]


Phylogenetic relations: Molecular Genotypes recognised (data from PFR2 database, June 2017), one genotype only from sequences. References: Darling et al. 2003; Darling et al. 2006; Darling & Wade 2008; Stewart et  al. 2001;

Most likely ancestor: Neogloboquadrina pachyderma - at confidence level 1 (out of 5). Data source: .

Biostratigraphic distribution

Geological Range:
Notes: Bandy (1972) documented separation of cooler sinistral vs warmer dextral forms throughout the range of <>N. pachyderma (sensu lato)
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N16 zone (8.58-9.83Ma, base in Tortonian stage). Data source: Bandy 1972

Plot of occurrence data:

References:

Bandy, O. L. (1972). Origin and development of Globorotalia (Turborotalia) pachyderma (Ehrenberg). Micropaleontology. 18(3): 294-318. gs

Brummer, G. J. A. & Kroon, D. (1988). Planktonic foraminifers as tracers of ocean-climate history. Free University Press, Amsterdam. 1-346. gs

Cifelli, R. (1961). Globigerina incompta, a new species of pelagic foraminifera from the North Atlantic. Contributions from the Cushman Foundation for Foraminiferal Research. 12: 83-86. gs V O

Darling, K. F. & Wade, C. M. (2008). The genetic diversity of planktic foraminifera and the global distribution of ribosomal RNA genotypes. Marine Micropaleontology. 67: 216-238. gs

Darling, K. F., Kucera, M., Wade, C. M. , von Langen, P. & Pak, D. (2003). Seasonal distribution of genetic types of planktonic foraminifer morphospecies in the Santa Barbara Channel and its paleoceanographic implications. Paleoceanography. 18: 1-11. gs

Darling, K. F., Kucera, M., Kroon, D. & Wade, C. M. (2006). A resolution for the coiling direction paradox in Neogloboquadrina pachyderma. Paleoceanography. 21: A2011-. gs

Lam, A. & Leckie, R. M. (2020). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. gs

Setty, M. G. A. P. (1977). Occurrence of Neogloboquadrina pachyderma new subspecies in the shelf-slope sediments of Northern Indian Ocean. Indian Journal of Marine Sciences. 6: 72-75. gs

Stewart, I. A., Darling, K. F., Kroon, D., Wade, C. M. & Troelstra, S. R. (2001). Genotypic variability in subarctic Atlantic planktic foraminifera. Marine Micropaleontology. 43: 143-153. gs


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Neogloboquadrina incompta compiled by the pforams@mikrotax project team viewed: 14-5-2021

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