Dentoglobigerina binaiensis

Classification: pf_cenozoic -> Globigerinidae -> Dentoglobigerina -> Dentoglobigerina binaiensis
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.,


Citation: Dentoglobigerina binaiensis (Koch, 1935)
Rank: species
Basionym: Globigerina binaiensis Koch, 1935
Taxonomic discussion:

This species was first described by Koch (1926) as Globigerina? aspera. He illustrated two specimens that were deposited in the Natural History Museum, Basel, along with a range of unfigured specimens. These specimens (illustrated and un-illustrated) form the type series with the status of syntypes, because no specimen was specifically designated as a holotype. Koch later realized that the combination Globigerina aspera was already taken by Ehrenberg (1854) making it a junior homonym, and so renamed his species binaiensis after the type locality at Binai-Atingdunok (Koch, 1935).

According to Bolli quoted in Stainforth and others (1975: footnote on p. 254), one of the two illustrated syntypes had disintegrated hence they designated the other as the lectotype. This act made that specimen the name-bearing type and all other members of the type series (including the broken specimen) paralectotypes. Some ambiguity arises because Stainforth and others (1975) remarked that “the specimen illustrated by Koch as Figure 23a-c and reproduced here as 7a-c is the lectotype” whereas the one they illustrated as their Figure 7a-c is in fact the specimen illustrated by Koch as Figure 22a-c. This ambiguity was clarified by Bolli and Saunders (1985) who published a re-illustration of Koch’s first specimen, labeling it (incorrectly) as ‘holotype’ (should be lectotype), along with some SEMs of ‘topotype’ specimens from the type locality (which are in fact unfigured paralectotypes).

As part of this study we have borrowed the lectotype and additional unfigured paralectotypes of binaiensis from Koch’s collection in the Natural History Museum, Basel courtesy of M. Knappertsbusch, which clearly illustrate the nature of the species in SEM and its variability (Pl. 11.2). We note that Koch’s original drawing of the specimen that later became the lectotype (Pl. 11.2, Fig. 1) is slightly misleading in that the suture between the penultimate and antepenultimate chambers seems to be wrongly placed, and similar problems exist with the sutures on the spiral side drawing (not reproduced here). Despite this, the illustrations provided a reasonable idea of the species and formed the basis of a stable species concept for subsequent workers. The aperture is filled with sediment but its shape is faithfully represented in the illustration. The newly illustrated paralectotypes include two slightly kummerform individuals (Pl. 11.2, Figs. 8-10, 14-16) that are broadly homeomorphic with Globoquadrina dehiscens.

The type series and our new illustrations of specimens from the tropical Pacific Ocean (Pl. 11.3) show the variability of the aperture, which, like some other species of Dentoglobigerina, can vary from a simple unadorned arch to having an inflected pustulose rim or even a pointed tooth. Bullate specimens (e.g. Pl. 11.3, Figs. 13-15) are quite common if not frequently illustrated in the literature. There is no strong preference in coiling direction.

Dentoglobigerina binaiensis is a tightly coiled form with three chambers in the final whorl. Four chambered morphotypes referred by authors to this species that are more loosely coiled with a more open umbilicus are more appropriately referred to Dentoglobigerina juxtabinaiensis Fox and Wade (2013). [Wade et al. 2018]

Catalog entries: Globigerina binaiensis

Type images:

Distinguishing features: Like D. sellii but with larger final chamber and acutely cut-off apertural face as seen in side view; with reduced porosity or smooth areas on the apertural face, and with thickened rims on the chamber shoulders.

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.


Diagnostic characters:

Dentoglobigerina binaiensis is distinguished from its ancestor D. sellii by its larger final chamber and acutely cut-off apertural face as seen in side view, with reduced porosity or smooth areas on the apertural face, and by the enhanced thickened rims on the chamber shoulders. This species is distinguished from Globoquadrina dehiscens by being hemispherical in equatorial outline rather than quadrate, and by having 3 rather than 4 chambers per whorl. Kummerform specimens of binaiensis (i.e., lacking the large and distinctive final chamber) may resemble dehiscens quite closely and are best distinguished by the odd orientation of the final chamber and aberrant stepped sutures (e.g., Pl. 11.2, Figs. 14-16). See also under D. juxtabinaiensis for means of distinguishing that species. [Wade et al. 2018]

Wall type: Normal perforate, weakly cancellate and densely pustulose, probably spinose in life.

Test morphology: Large, almost hemispherical; in umbilical view 3 embracing chambers in the ultimate whorl that rapidly increase in size, especially the final chamber which can be very large with a sharply angled apertural face making up to two-thirds of the test size, commonly with a bulla, smooth or reduced porosity and with a thickened pustulose rim, umbilicus low and broad, restricted, aperture umbilical, a low arch, occasionally with an umbilical tooth or deflection, umbilical sutures depressed, commonly highlighted by thickened pustulose chamber edges; in spiral view 3 embracing, elliptical chambers that rapidly increase in size in ultimate whorl, ultimate chamber makes up half of test size, sutures weakly depressed and sometimes highlighted by pustulose rims of previous chambers; in edge view convexo-concave, rounded spiral side and convex umbilical side. The cut-away shape of the final chamber is very distinctive in edge view. [Wade et al. 2018]

Size: Maximum diameter of lectotype 0.32 mm. [Wade et al. 2018]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Petaloidcoiling axis:Moderateperiphery:N/Aaperture border:Thin flange
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.0-3.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: According to Blow (1969, caption to pl. 13) this species is restricted to the Indo-Pacific (see also Kennett and Srinivasan, 1983) but subsequent studies in the Atlantic Ocean and Gulf of Mexico (Spezzaferri and Premoli Silva, 1991; Pearson and Chaisson, 1997) show that it is global in low latitudes. [Wade et al. 2018]

Isotope paleobiology: Pearson and Shackleton (1995) analyzed two samples of D. binaiensis, finding them to have oxygen isotope ratios significantly more positive than Trilobatus trilobus and D. altispira, indicating a thermocline depth habitat. [Wade et al. 2018]

Phylogenetic relations: According to Blow (1969) and subsequent authors, this species evolved from Dentoglobigerina sellii, with which it intergrades in the upper Oligocene, as also observed in the studies of the Working Group. [Wade et al. 2018]

Most likely ancestor: Dentoglobigerina sellii - at confidence level 4 (out of 5). Data source: Wade et al. 2018.
Likely descendants: Dentoglobigerina juxtabinaiensis;

Biostratigraphic distribution

Geological Range:
Notes: The lowest occurrence of this species is in upper Oligocene Zone N3 (=Zones O6/O7 of this work), as indicated by Blow (1969), Postuma (1971), and Bolli and Saunders (1985), among others. Spezzaferri (1994) recorded its lowest occurrence at the same level as the lowest occurrence of Paragloborotalia pseudokugleri, equivalent to the base of Zone O7 of this work. The highest occurrence has traditionally been recorded as within lower Miocene Zone N5 (=M2/M3) (e.g. Blow, 1969:316; Chaisson and Leckie, 1993); see also Spezzaferri (1994:43). At Ceara Rise, Pearson and Chaisson (1997) recorded its highest occurrence in the equivalent of Zone M3 (see also Wade and others, 2011) but noted it was “one of the least successful datums for correlation…a function of the extreme rarity of the species in the higher part of its range” (Pearson and Chaisson 1997:39). It is regrettable that such a distinctive species should make such a poor zone fossil. [Wade et al. 2018]
Last occurrence (top): within M3 zone (17.54-19.30Ma, top in Burdigalian stage). Data source: Wade et al. 2018
First occurrence (base): within O7 zone (22.96-25.21Ma, base in Chattian stage). Data source: Wade et al. 2018 f11.1

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.338


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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 :: ::

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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 :: ::

Koch, R. (1926). Mitteltertiare Foraminiferen aus Bulongan, Ost-Borneo. Eclogae Geologicae Helvetiae. 19(3): 722-751. gs :: ::

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Pearson, P. N. & Chaisson, W. P. (1997). Late Paleocene to middle Miocene planktonic foraminifer biostratigraphy, Ceara Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 33-68. gs :: ::

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 401-410. gs :: ::

Pearson, P. N. (1995). Planktonic foraminifer biostratigraphy and the development of pelagic caps on guyots in the Marshall Islands group. Proceedings of the Ocean Drilling Program, Scientific Results. 144: 21-59. gs :: ::

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs :: ::

Quilty, P. G. (1976). Planktonic foraminifera DSDP Leg 34, Nazca Plate. Initial Reports of the Deep Sea Drilling Project. 34: 629-703. 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 :: ::

Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions, Articles. 62: 1-425. gs :: ::

Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. 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 :: ::


Dentoglobigerina binaiensis compiled by the pforams@mikrotax project team viewed: 8-8-2020

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