Daughter taxa (time control age-window is: 0-800Ma) | ||||
tapuriensis -> binaiensis lineage | ||||
Dentoglobigerina juxtabinaiensis Like D. binaiensis but with 4 rather than 3 chambers in the final whorl, less rapid chamber expansion and a more open umbilicus. | ||||
Dentoglobigerina binaiensis 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. | ||||
Dentoglobigerina sellii Like D. tapuriensis, but with more rapidly expanding chambers, a more flattened umbilical face to the final chamber, and a more spherical overall morphology. | ||||
Dentoglobigerina tapuriensis 3 compressed chambers in final whorl. Umbilicus elliptical, deep; with thin lip. | ||||
galavisi -> baroemensis lineage | ||||
Dentoglobigerina baroemoenensis Like D. larmeui but chambers more angular, disjunct and slightly reniform; outline more trapezoidal outline; umbilicus broad & deep. | ||||
Dentoglobigerina larmeui Like D. galavisi but slightly wider and more open umbilicus and more distinctly flattened umbilical face to the final chamber, giving rise to a somewhat quadrate form; also typically 3½-4 chambers in the final whorl (vs. 3-3½). | ||||
Dentoglobigerina galavisi 3 moderately compressed chambers in final whorl. Umbilicus broadly triangular; with asymmetrical narrow tooth. | ||||
globular -> altispira lineage | ||||
Dentoglobigerina altispira High trochospiral. Aperture umbilical with teeth projecting into umbilicus | ||||
Dentoglobigerina globosa Like D. globularis but with 5-6 chambers in the final whorl leading to a more lobulate outline; also wider umbilicus. | ||||
Dentoglobigerina globularis Like D. galavisi but larger, more open coiling with 3½-4 chambers in the whorl (vs. 3-3½), more open umbilicus, less embracing chambers, and slightly higher spire. | ||||
Other species | ||||
Dentoglobigerina prasaepis 3½ globular slightly compressed chambers in final whorl. Umbilicus rectangular, broad, open; with thin lip. | ||||
Dentoglobigerina pseudovenezuelana 3-3½ globular slightly compressed chambers in final whorl. Umbilicus narrow triangular, with irregular pustulose tooth. | ||||
Dentoglobigerina taci 3½ globular chambers in final whorl. Umbilicus open, square; with thin lip. | ||||
Dentoglobigerina tripartita Test compact, subcircular to subquadrate; cap-like final chamber extends over umbilicus. Aperture umbilically centered; with an irregular, subtriangular lip. | ||||
Dentoglobigerina eotripartita Like D. tripartita but smaller, and less spherical, less compressed/reniform overall morphology. | ||||
Dentoglobigerina venezuelana Large to very large, robust, outline circular; 3½-4 embracing, reniform chambers in the final whorl, final chamber commonly reduced in size and flattened; umbilicus small, commonly triangular may have a tooth | ||||
Dentoglobigerina sp. Specimens which cannot be assigned to established species |
As discussed under Family Globigerinidae above, the Working Group now regards Dentoglobigerina as having been spinose in life, at least in its primitive condition. Fox and Wade (2013) illustrated spine holes in the Miocene species D. juxtabinaiensis and Pearson and Wade (2015) illustrated spine holes or possible spine holes in D. galavisi, D. pseudovenezuelana, D. taci, D. tapuriensis, and D. cf. tripartita (= D. eotripartita n. sp. in this work). Here we present additional evidence for spine holes in D. baroemoenensis, D. larmeui, and D. binaiensis. Species for which spine holes have not yet been observed are: D. globosa, D. globularis, D. prasaepis, D. sellii, D. tripartita, D. venezuelana and Globoquadrina dehiscens. It seems that some species in the genus may have been quite densely spinose in life while others were sparsely spinose or even secondarily nonspinose (i.e., lost spines during their evolution). [Wade et al 2018] Whereas Olsson and others (2006) suggested that Dentoglobigerina was derived from the muricate Eocene genus Acarinina, we now think an origin in the spinose genus Subbotina is much more likely (see discussion under Family Globigerinidae above), as suggested previously for example by Blow (1979) and Bolli and Saunders (1985) (see also Pearson and Wade, 2015). The ancestral form could have been Subbotina yeguaensis, which frequently has an umbilical tooth, and could have given rise to D. galavisi in the middle Eocene (Zone E12). [Wade et al 2018] According to Blow’s (1979) original definition, the genus requires a globigeriniform morphology and the presence of an umbilical tooth, hence the name Dentoglobigerina. However, observations of modern species e.g., Dentoglobigerina cf. conglomerata and the unrelated Neogloboquadrina dutertrei show that a tooth can vary greatly between individuals and is not always present. As discussed by Pearson and Wade (2015), Blow’s definition would unite a variety of unrelated species and exclude some potentially closely related forms. Some Dentoglobigerina species (e.g., galavisi) consistently have a very prominent umbilical tooth, while in other species the tooth is generally absent (e.g., tapuriensis). Here we emphasize that the umbilical tooth is a variable character and should not be part of the generic diagnosis although it can help in identifying species. We follow Pearson and Wade (2015) by allowing forms without a tooth within the genus Dentoglobigerina but restricting it to D. galavisi and its likely descendants. We exclude various toothed forms with inflated, spherical chambers, which are better placed in Subbotina (see Chapter 10, this volume). [Wade et al 2018] Several species of Dentoglobigerina are distinctly pustulose, particularly on the umbilical face, with a concentration of pustules in the umbilical region and on the umbilical shoulders. The pustules can be large and abundant, particularly in the species D. sellii. [Wade et al 2018] The genus Dentoglobigerina, as used here in the phylogenetic sense, includes the D. galavisi - D. globularis - D. altispira globulosa - D. altispira altispira lineage (Text Fig. 20). It includes morphotypes with umbilical teeth over an umbilically restricted aperture. Dentoglobigerina is morphologically intermediate between Globigerina and Globoquadrina. It resembles Globigerina by exhibiting an umbilically restricted aperture and Globoquadrina in possessing one or more umbilical teeth. The genus evolved in the late Oligocene and is largely confined to the Miocene. [Kennett & Srinivasan 1983]
Catalog entries: Dentoglobigerina
Distinguishing features:
Parent taxon (Globigerinidae): Wall spinose, usually with 3½-6 globular chambers in final whorl, trochospiral or planispiral
This taxon: Trochospiral test with umbilically restricted aperture and usually one or more umbilical teeth
Morphology:
Wall type:
Geographic distribution
Phylogenetic relations
Most likely ancestor: Subbotina - at confidence level 2 (out of 5). Data source: Wade et al 2018.
Likely descendants: Globoquadrina;
plot with descendants
Geological Range:
Notes: Middle Eocene (Zone E12) to Recent. [Wade et al 2018]
Last occurrence (top): at top of PL4 [Atl.] zone (100% up, 3.1Ma, in Piacenzian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within E10 zone (41.89-43.23Ma, base in Lutetian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.334 (major revision of Olsson et al. 2006, chapter 13, p. 401); Kennett & Srinivasan 1983, p.188
Bermudez, P. J. (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Editorial Sucre, Caracas. (3): 1119-1393. 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 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 Hemleben, C., Mohlen, D., Olsson, R. K. & Berggren, W. A. (1991). Surface texture and the first occurrence of spines in planktonic foraminfera from the early Tertiary. Geologisch Jarhbuch. 128: 117-146. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Olsson, R. K., Hemleben, C. & Pearson, P. N. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Dentoglobigerina. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 13): 401-412. gs O Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. 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 References:
Dentoglobigerina compiled by the pforams@mikrotax project team viewed: 14-12-2024
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