Catalog - Dentoglobigerina juxtabinaiensis

CATALOG OF ORIGINAL DESCRIPTIONS: Dentoglobigerina juxtabinaiensis Fox and Wade 2013

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> D -> Dentoglobigerina -> Dentoglobigerina juxtabinaiensis
Other pages this level: D. eotripartita, D. juxtabinaiensis, D. taci

Dentoglobigerina juxtabinaiensis

Citation: Dentoglobigerina juxtabinaiensis Fox and Wade 2013
Rank: Species
Type specimens: Holotype: PM PF 70870 (Site U1337-42X-CC). Paratypes: PM PF 70871, 70872 (Site U1338B-41H-3, 30–32 cm); 70873, 70875–70877 (Site U1338A-42X-CC); 70874 (Site 871-15H-1, 124–126 cm); 70878, 70881 (Site 871-12H-2, 59–61 cm); 70879 (Site U1337A-38CX-CC); and
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (70874) London, UK; NHM (70873) London, UK; NHM (70871) London, UK; NHM (70879) London, UK; NHM (70877) London, UK; NHM (70878) London, UK; NHM (70875) London, UK; NHM (70872) London, UK; NHM (70881)

Current identification/main database link: Dentoglobigerina juxtabinaiensis Fox & Wade 2013


Original Description

Test wall macroperforate, spinose; chambers arranged in a moderate trochospiral; test tightly coiled with 3 whorls, 4 chambers in the final whorl, increasing slowly then rapidly in size with the arched final chamber accounting for half of the test; peripheral outline rounded in umbilical and spiral view, semi-circular to major circular sectoral in edge view; chambers on umbilical side, wedge shaped, with final chamber semi-circular and flattened; dense and fused pustules concentrated around the periphery; sutures distinct, incised, straight to slightly curved; deep umbilical aperture bordered by a thin to broad lip, sometimes pustulose, with an imperforate area on the umbilical face; on spiral side chambers ovoid; sutures weakly depressed, curved.

Size:

Etymology:
Derived from ‘‘juxta’’ referring to its close relationship to its ancestor D. binaiensis.

Extra details from original publication
Synonymy

Stratigraphic range. - U1338A-38X-2, 35–37 cm R U1338A-44X-3, 102–104 cm. The highest occurrence is not currently well constrained. It is abundant up to Zone M5a at Site U1338, with intermittent occurrences to the top of Zone M5b (recorded as Globoquadrina cf. binaiensis in Pälike and others, 2010). The lowest occurrence is in Zone M2 at Site U1337.

Remarks. Dentoglobigerina binaiensis is used as a secondary biostratigraphic marker within Zone M2 (Wade and others, 2011). However, four-chambered forms referred to as Globoquadrina cf. binaiensis were found at Sites U1337 and U1338 (Pälike and others, 2010). To retain the utility of D. binaiensis as a bioevent we have chosen to apply a strict species concept and confine D. binaiensis to the three-chambered forms, consistent with the original description (Fig. 5.3a). This, therefore, necessitates describing the common four-chambered forms that are found in the early Miocene and earliest middle Miocene as a new species.
D. juxtabinaiensis is distinguished from its ancestor D. binaiensis by its greater number of chambers (4 rather than 3) in the final whorl, which are also more wedge shaped. It differs from G. dehiscens by its more circular periphery and lack of umbilical shoulders. Specimens commonly show evidence of a broken ultimate chamber as seen in Figures 6.2 and 6.5. The lip is highly variable and can appear tooth-like in some specimens.
Spezzaferri (1994) recognized these forms as the more evolved D. binaiensis in the early Miocene from the eastern tropical Atlantic Ocean (Site 667) and equatorial Indian Ocean (Site 709). Chaisson and Leckie (1993) also distinguished between the three- and four-chambered specimens of D. binaiensis in their study from the western equatorial Pacific Ocean (Site 806).
Significantly many of our specimens show evidence of spine holes, indicative of a spinose wall texture. Previously, Dentoglobigerina and Globoquadrina have been considered non-spinose (e.g., Pearson and others, 2006).

Phylogeny. Dentoglobigerina juxtabinaiensis evolved from D. binaiensis in the early Miocene by developing four chambers in the final whorl and a more open aperture.

Distribution. Probably restricted to low latitudes; known from the equatorial regions of the Indian Ocean, Atlantic Ocean (Spezzaferri, 1994), and Pacific Ocean (Chaisson and Leckie, 1993; this study).


Editors' Notes

References:

Fox, L. R. & Wade, B. S. (2013). Systematic taxonomy of early–middle Miocene planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338. Journal of Foraminiferal Research. 43: 374-405. gs


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Dentoglobigerina juxtabinaiensis compiled by the pforams@mikrotax project team viewed: 2-7-2022

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