Dentoglobigerina baroemoenensis


Classification: pf_cenozoic -> Globigerinidae -> Dentoglobigerina -> Dentoglobigerina baroemoenensis
Sister taxa: D. juxtabinaiensis, D. binaiensis, D. sellii, D. tapuriensis ⟩⟨ D. baroemoenensis, D. larmeui, D. galavisi ⟩⟨ D. altispira, D. globosa, D. globularis ⟩⟨ D. prasaepis, D. pseudovenezuelana, D. taci, D. tripartita, D. eotripartita, D. venezuelana, D. sp.

Taxonomy

Citation: Dentoglobigerina baroemoenensis (LeRoy, 1939)
Rank: species
Basionym: Globigerina baroemoenensis LeRoy, 1939
Synonyms:
Taxonomic discussion:

We have identified spine holes in this species (Pl. 11.1, Fig. 12). The holotype was deposited in the collection of the Javanese Geological Survey. It was reported to be present there by Blow (1969) (fide Dr H.S.N. Hartono), but we have been unable to locate it for our investigation, so we base our concept on LeRoy’s type illustrations (see Pl. 11.1, Figs. 1, 2) which are similar to the specimens illustrated in Kennett and Srinivasan’s (1983) influential Neogene atlas (reproduced in Pl. 11.1, Figs. 9-11). Those specimens, however, are more gracile in overall morphology and slightly less angular than the holotype, with less prominent umbilical teeth.

Blow (1969) illustrated ‘early’ (pl. 28, fig. 8) and ‘phylogenetically advanced’ (pl. 28, fig. 4) specimens of baroemoenensis. The latter strongly resembles the holotype from the Miocene of Sumatra, while the former is nearly identical to the form illustrated by Spezzaferri (1994; pl. 40, fig. 1a-c) from the upper Oligocene, highlighting the variable nature of this taxon and, possibly, its evolutionary development.

Blow (1969) recognized that the high-spired paratypes deposited in the U.S. National Museum were not conspecific with the holotype, which we have confirmed with new SEMs (which are not shown here but are available at the U.S. National Museum website). Blow (1969) regarded baroemoenensis as a descendant of galavisi, with which we agree, although we regard D. larmeui as an intermediate morphotype. He recorded having observed the phyletic transition in samples from Trinidad, Barbados, Venezuela, Iran, and the Far East. Spezzaferri and Premoli Silva (1991) and Spezzaferri (1994) also described this transition.

LeRoy (1944) named a new subspecies, Globigerina baroemoenensis quadrata, from similar material in Java but here we include this variety in synonymy. The slightly more gracile form illustrated by the specimen in his plate 7, figs. 37-39, is close to the specimens illustrated by Kennett and Srinivasan (1983) as baroemoenensis, whereas the other specimen illustrated in his plate 3, figs. 34 and 35 is kummerform with slightly misleading gross morphology. [Wade et al. 2018]

Catalog entries: Globigerina baroemoenensis, Globigerina baroemoenensis quadrata, Globoquadrina langhiana

Type images:

Distinguishing features: Like D. larmeui but chambers more angular, disjunct and slightly reniform; outline more trapezoidal outline; umbilicus broad & deep.

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


Wall type: Normal perforate, cancellate, spinose in life.

Morphology: Test a low trochospiral, trapezoidal in outline; in spiral view 4 (rarely 3) flattened, slightly reniform chambers, increasing gradually in size, sutures straight, weakly depressed; in umbilical view 3½-4 subspherical to slightly reniform chambers in ultimate whorl increasingly slowly in size, slightly disjunct at the sutures, ultimate chamber of the holotype with distinct sloping or near vertical perforated apertural face, may have a reduced bulla-like final chamber which extends over the umbilicus; umbilicus deep and broad, quadrangular, aperture a low arch set deep in the umbilicus beneath a broad tooth. [Wade et al. 2018]

Size: Maximum diameter of holotype 0.50 mm (LeRoy, 1939). [Wade et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Moderateperiphery:N/Aaperture border:Thin flange
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:0.0-0.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: So far identified mainly from tropical latitudes. [Wade et al. 2018]

Isotope paleobiology: No data available. [Wade et al. 2018]

Phylogenetic relations: This species evolved from Dentoglobigerina larmeui by attaining more disjunct and angular chambers, a more trapezoidal outline and a deeper, wider umbilicus, features that seemingly become more pronounced in younger, Miocene age specimens. [Wade et al. 2018]

Most likely ancestor: Dentoglobigerina larmeui - at confidence level 4 (out of 5). Data source: Wade et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: The oldest illustrated specimen of this species is from Zone O4 of the Caribbean (Spezzaferri and Premoli Silva, 1991) although the same authors recorded it as low as Zone P20 (=Zone O2), as also recorded by Blow (1969). Rögl (1985) restricted its occurrence to the lower Miocene of the Central Paratethys. According to Kennett and Srinivasan (1983) and various authors following their taxonomy, it persists to the end of the Miocene or basal Pliocene (Chaisson and Leckie, 1993), although its highest occurrence has not been studied as part of this investigation. [Wade et al. 2018]
Last occurrence (top): within N18 zone (5.20-5.72Ma, top in Zanclean stage). Data source: Wade et al. 2018
First occurrence (base): within O2 zone (30.28-32.10Ma, base in Rupelian stage). Data source: Kennett and Srinivasan (1983)

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.335; Kennett & Srinivasan 1983 p. 186

References:

Berggren, W. A., Aubry, M. -P. & Hamilton, N. (1983). Neogene magnetobiostratigraphy of DSDP Site 516, Rio Grande Rise (South Atlantic). Initial Reports of the Deep Sea Drilling Project. 72: 675-713. gs

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Chaisson, W. P. & Leckie, R. M. (1993). High-resolution Neogene planktonic foraminifer biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific). Proceedings of the Ocean Drilling Program, Scientific Results. 130: 137-178. gs

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

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

LeRoy, L. W. (1939). Some small foraminifera ostracoda and otoliths from the Neogene (Miocene) of the Rokan-Tapanoeli area, central Sumatra,. Natuurk. Tijdschr. Nederl.-Indie. 99(6): 215-296. gs

LeRoy, L. W. (1944b). Miocene foraminifera from Sumatra and Java, Netherlands East Indies, part 1. Miocene foraminifera of central Sumatra, Netherlands East Indies. Colorado School of Mines Quarterly. 39(3): 1-69. gs

Poore, R. Z. (1979). Oligocene through quarternary planktonic foraminiferal biostratigraphy of the North Atlantic: DSDP LEG 49. Initial Reports of the Deep Sea Drilling Project. 49: 447-517. gs

Rögl, F. (1985). Late Oligocene and Miocene planktic foraminifera from the Central Paratethys. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge, UK 315-328. gs

Spezzaferri, S. & Premoli Silva, I. (1991). Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico. Palaeogeography Palaeoclimatology Palaeoecology. 83: 217-263. gs

Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. gs

Wade, B. S., Pearson, P. N., Olsson, R. K., Fraass, A. J., Leckie, R. M. & Hemleben, C. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Dentoglobigerina and Globoquadrina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 11): 331-384. gs V O


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Dentoglobigerina baroemoenensis compiled by the pforams@mikrotax project team viewed: 15-1-2021

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