Catalog - Neogloboquadrina inglei

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Neogloboquadrina inglei

Citation: Neogloboquadrina inglei Kucera&Kennett 2000

Type specimens: Catalogue numbers: USNM 509369 (holotype) and 509370 (paratype).

Type sample (& lithostrat): ODP Hole 1014A, sample 9X-06 118 cm,

Type age (chronostrat): mid Pleistocene.

Type locality: ODP Hole 1014A, Tanner Basin, northeastern Pacific.

Type repository: Washington, USNM

Test relatively large (0.2–0.4 mm in diameter), almost exclusively dextrally coiled, rounded, lobulate in both axial and equatorial periph- eries. 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. Surface ultrastructure crystalline with prominent heavily calcified ridges surrounding pores.

In honor of Prof James Ingle Jr., micropaleontologist and paleoceanographer at Stanford University, CA.

Synonymy:

Neogloboquadrina pachyderma form 2, Keller (1978a), Pl. 1, Fig. 2; Pl. 3, Figs. 1–9.
Neogloboquadrina pachyderma forma A, Matoba and Oda (1982), Pl. 4, Figs. 11–13.
Neogloboquadrina pachyderma forma B, Matoba and Oda (1982), Pl. 4, Figs. 17 and 18.
?non Neogloboquadrina pachyderma forma B, Matoba and Oda (1982), Pl. 4, Figs. 14–16.
Neogloboquadrina pachyderma A, Kennett et al. (2000), Pl. 1, Figs. 4, 5, 9, 10.

Variability: Specimens of the species with less than four chambers in the last whorl are rare, often including smaller individuals (Pl. I, Figs. 6, 11.) or kummerforms (Pl. I, Fig. 2). Rare sinistral variants have been observed at Site 1014, as well as at Site 1018. Apertural lip may vary from distinct elevated rim (Pl. I, Figs. 1, 3–4, 9) to only faintly represented feature on the outer apertural face of the last chamber (Pl. I, Figs. 10, 13). Due to dissolution, some specimens appear to show a relatively open umbilicus with broader, nearly umbilical aperture.

Remarks: 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.

Occurrence: 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). It has been found in ODP Leg 167 sites along the California margin (Kennett et al., 2000), in the Gulf of California (Matoba and Oda, 1982), and in DSDP sites from the northeastern Pacific (Keller, 1978a,b). It seems to have been encountered in Japan, where it is referred to as “small Neogloboquadrina asanoi” (Ibaraki, M., pers. comm., 1999).

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

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

CATALOG OF ORIGINAL DESCRIPTIONS: Neogloboquadrina inglei Kucera&Kennett 2000

Neogloboquadrina inglei

References:

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