pforams@mikrotax - Neogloboquadrina inglei pforams@mikrotax - Neogloboquadrina inglei

Neogloboquadrina inglei


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

Taxonomy

Citation: Neogloboquadrina inglei Kucera & Kennett 2000
taxonomic rank: Species
Basionym: Neogloboquadrina inglei Kucera & Kennett 2000
Synonyms:

Catalog entries: Neogloboquadrina inglei

Type images:

Distinguishing features:
Parent taxon (Neogloboquadrina): Cancellate wall; umbilical-extraumbilical aperture:
This taxon: Like N. pachyderma but larger, with rounded axial periphery and inflated chambers.

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:
Almost exclusively dextrally coiled, rounded, lobulate in both axial and equatorial peripheries. 4 to 3½ globular chambers in the last whorl, slowly expanding in size giving the test somewhat quadrate appearance.

Aperture narrow umbilical–extraumbilical bordered with thin lip.

Variability: Specimens of the species with less than four chambers in the last whorl are rare, often including smaller individuals or kummerforms . Rare sinistral variants have been observed at Site 1014, as well as at Site 1018. Apertural lip may vary from distinct elevated rim to only faintly represented feature on the outer apertural face of the last chamber. Due to dissolution, some specimens appear to show a relatively open umbilicus with broader, nearly umbilical aperture. [Kucera & Kennett 2000]

Wall type:
Surface ultrastructure crystalline with prominent heavily calcified ridges surrounding pores. [Kucera & Kennett 2000]

Size:
relatively large (0.2–0.4 mm in diameter). [Kucera & Kennett 2000]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin 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:3.5-4 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Similar species

This species differs from Neogloboquadrina pachyderma primarily by its larger test, typical rounded shape of the axial periphery and inflated chambers. It is somewhat smaller than both N. asanoi and N. kagaensis, from which it also differs by narrower aperture and much slower rate of chamber expansion in the last whorl. [Kucera & Kennett 2000]

Most likely ancestor: Neogloboquadrina pachyderma - at confidence level 2 (out of 5). Data source: indirectly suggested by Kucera & Kennett 2000.

Biostratigraphic distribution

Geological Range:
Notes: Neogloboquadrina inglei n. sp. is generally present in the early and middle Pleistocene (1.5–0.7 Ma), although it seems to have originated in the Late Pliocene ( 1.9 Ma, Table 3).
Last occurrence (top): within Middle Pleistocene Sub-Epoch (0.13-0.78Ma, top in Ionian stage). Data source: Kucera & Kennett 2000
First occurrence (base): within Late Pliocene Sub-Epoch (2.59-3.60Ma, base in Piacenzian stage). Data source: Kucera & Kennett 2000

Plot of occurrence data:

Primary source for this page: Kucera & Kennett 2000

References:

Keller, G. (1978). Morphologic variation of Neogloboquadrina pachyderma (Ehrenberg) in sediments of the marginal and central northeast Pacific Ocean and paleoclimatic interpretation. Journal of Foraminiferal Research. 8(3): 208-224. gs

Kennett, J. P., Rozo-Vera, G. A. & Machain Castillo, M. L. (2000). Latest Neogene planktonic foraminiferal biostratigraphy of the California Margin. Proceedings of the Ocean Drilling Program, Scientific Results. 167: -. gs

Kucera, M. & Kennett, J. P. (2000). Biochronology and evolutionary implications of Late Neogene California margin planktonic foraminiferal events. Marine Micropaleontology. 40: 67-81. gs

Lam, A. & Leckie, R. M. (2020a). 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

Matoba, Y. & Oda, M. (1982). Late Pliocene to Holocene planktonic foraminifers of the Guayamas Basin, Gulf of California, Sites 477 through 481. Initial Reports of the Deep Sea Drilling Project. 64: 1003-1026. gs

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Neogloboquadrina inglei compiled by the pforams@mikrotax project team viewed: 19-9-2024

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