Dentoglobigerina galavisi Bermudez 1961 (TaxonConcept

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Species Dentoglobigerina galavisi Bermudez 1961

Diagnosis / Definition:

Pearson et al. (2006):
DESCRIPTION. Type of wall: cancellate, honeycomb, normal perforate, nonspinose, Globoquadrina-type wall. Test morphology: Test trochospiral, globular, oval in outline, chambers globular; in spiral view 3 1/2 ovoid chambers in ultimate whorl, increasing rapidly in size, sutures moderately depressed, straight to slightly curved; in umbilical view 3 1/2 ovoid chambers increasing rapidly in size, sutures deeply depressed, straight; umbilicus small, enclosed by surrounding chambers, aperture centered over the umbilicus, bordered by a thin irregular, triangular-shaped lip that is centered below an ill-defined apertural face; in edge view chambers ovoid in shape, projecting over the umbilicus, ultimate chamber shows a distinct bending and flattening into the umbilicus forming an indistinct umbilical face. Size: Maximum diameter of holotype 0.46 mm. thickness0s. 40 mm.

Discussion / Comments:

Spezzaferri & Silva (1990):
Transitional forms to D. haroernoenensis occur in Zone P19 (Plate II, 2a c, 3a d).
Pearson et al. (2006):
DISTINGUISHING FEATURES.- The species is characterized by its oval-shaped chambers that sin-round the umbilicus, the bending and flattening of the ultimate chamber into the umbilicus, and the umbilically confined aperture with an irregular, triangular-shaped lip that projects over the umbilical opening. DISCUSSION. - Blow ( 1970) theated the holotype of Dentoglobigerina galavisi as separate from the "central type" of a plexus of middle and late Eocene morphotypes. The specimens he illustrated(his pl. 177, figs. 8, 9; pl. 244, fig. 1) as representing his concept of the "central type" of the species differ from the holotype (Pl. 61, Figs. 1-3, this volume) in having 4 chambers in the ultimate whorl (as seen on the umbilical side) in contrast to 3 1/2 in D. galavisi and in lacking a distinct symmetrically triangular lip (the lip in this pl. 244, fig 1 looks triangular but appears to be broken) Specimens illustrated in this volume from the upper Eocene of Mississippi, the level from which the species is described, show that the holotype is a typical morphology for the species Dentoglobigerina galavisi is a common component in upper Eocene and lower Oligocene sediments. The triangular lip or umbilical tooth appears to vary in the degree of its development but in typical specimens it occurs as a thin lip that tapers to a low triangular midpoint. PHYLOGENETIC RELATIONSHIPS.- Possibly evolved from an acarininid ancestor in Zone E13 and gave rise to Dentoglobigerina tripartita (Koch) and probably to Dentoglobigerina pseudovenezuelana (Blow and Banner). STRATIGRAPHIC RANGE.- Zone E13 to upper Oligocene Zone O6. GEOGRAPHIC DISTRIBUTION.- Widespread in low to mid latitudes. STABLE ISOTOPE PALEOBIOLGY.- Recorded (on the base of oxygen and carbon isotopic data) as a relatively deep dwelling form by Pearson and others (2001) from middle and upper Eocene samples, a habitat corroborated by the boron Isotope data of Pearson and Palmer ( 1990). However Oligocene Samples studied by Van Eijden and Ganssen (1995) registered the most negative ò18O of planktonic assemblages from ODP Site 758A, indicating a shallow habitat. Douglas and Savin (1978) also recorded relatively negative ò18O in upper Oligocene Samples.

Systematics:

22
Genus Dentoglobigerina
  Informal Group Dentoglobigerina baroemoensis
   Species Dentoglobigerina galavisi

35
  Ordo Foraminiferida
   Superfamilia Globigerinaceae
    Familia Globoquadrinidae
     Genus Dentoglobigerina
      Species Dentoglobigerina galavisi

Synonym list:

Vincent & Toumarkine (1990):

1960 Globigerina galavisi Bermudez. - Bermudez : p. 1183 pl. 4, fig. 3

1990 Dentoglobigerina galavisi Bermudez. - Vincent & Toumarkine : p. 796

Spezzaferri & Silva (1990):

1961 Globigerina galavisi Bermudez. - Bermudez : pl. 4; fig. 3

1961 Globigerina galavisi Bermudez. - Bermudez :

1990 Dentoglobigerina galavisi Bermudez. - Spezzaferri & Silva : p.239 pl. II; fig. 1a-d

Pearson et al. (2006):

1961 Globigerina galavisi Bermudez. - Bermudez : p.1183 pl. 4; fig. 3 [upper Eocene Jackson Fm., Mississippi]

p 1962 Globigerina yeguaensis yeguaensis Weinzierl & Applin. - Blow & Banner : p.99 pl. 13; fig. k-m (not figs. h, j); [lower Oligocene Globigerina oligocaenica Zone, Lindi area, Tanzania]; [Not Weinzierl and Applin, 1929]

1969 Globigerina galavisi Bermudez. - Blow : p.319 pl. 5, fig. 1-3 (reillustration of holotype); pl. 16, fig. 4 [upper Eocene Zone E15/16, upper Jackson Fm., Mississippi]; pl. 16, fig. 5 [upper Eocene Zone E14, Sample FCRM 1645, Lindi area, Tanzania]

1974 Globoquadrina galavisi Bermudez. - Fleisher : p.758 pl. 1; fig. 1, 2 [lower Oligocene Cassigerinella chipolensis- Pseudohastigerina barbadoensis Zone, DSDP Site 305, central North Pacific Ocean]

1979 Globigerina galavisi Bermudez. - Blow : p.319 pl. 5, fig. 1-3; pl. 16, fig. 4, 5 (reillustration of Blow, 1969, pl. 16, fig. 4, 5)

non 1979 Dentoglobigerina galavisi Bermudez. - Blow : p.1301 pl. 177, fig. 8, 9; pl. 186, fig. 8, 9; pl. 191, fig. 8, 9 [= assorted morphotypes of Subbotina]

1988 Dentoglobigerina galavisi Bermudez. - Poore & Bybell : p.16 pl. 4; fig. 6, 9 [upper Eocene Zone E1 6, ACGS Borehole, New Jersey Coastal Plain]

1991 Dentoglobigerina galavisi Bermudez. - Spezzaferri & Premoli Silva : p.243 pl. 2; fig. 1a-c [upper Oligocene Zone 06, DSDP Hole 538A, Gulf of Mexico]

1991 Dentoglobigerina galavisi Bermudez. - Spezzaferri & Premoli Silva : p.243 pl. 2, fig. 2a-c [upper Oligocene Zone 06, DSDP Hole 538A, Gulf of Mexico]; pl. 2, fig. 3a-c [lower Oligocene Zone 04, DSDP Hole 53814, Gulf of Mexico] [Dentoglobigerina galavisi (Bermudez)/D. baroemoenensis (LeRoy) transition]

1994 Dentoglobigerina galavisi Bermudez. - Nishi & Chaproniere : p.259 pl. 5; fig. 10-12 [upper Eocene Zones E14/15, ODP Hole 841B, Tonga Trench, South Pacific Ocean]

1995 Dentoglobigerina galavisi Bermudez. - Poag & Commeau : p.149 pl. 6; fig. 8 [upper Eocene Zone E14, Chickahominy Fm., USGS Exmore Core, Virginia]

2006 Dentoglobigerina galavisi Bermudez. - Pearson et al. : p.405 pl. 13.1; fig. 1-16 (Pl. 13.1, Figs. 1-3: new SEMs of holotype of Globigerina galavisi Bermudez)

Specimen:

Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM CC638941

References:

Bermudez,P.J. (1960):
Contribución al estudio de las Globigerinidae de la región Caribe-Antillana (Paleoceno-Reciente) . Mem. Tercer Congr. Geol. Venezolano Vol. 3

Bermudez,P.J. (1961):
Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleocene-Reciente).
In: Boletino Geologia (Venezuela), Special Publicacion Vol. 3

Blow,W.H. and Banner,F.T. (1962):
The Mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae.
In: Fundamentals of Mid‑Tertiary Stratigraphical Correlation Eds: Eames, F.E.Banner, F.T.Blow, W.H.Clarke, W.J. p. 61‑151

Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422

Fleisher,R.L. (1974):
Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A.
In: Initial Reports of the Deep Sea Drilling Project Vol. 23 Eds: Whitmarsh, R.B.Weser, O.E.Ross, D.A. p. 1001-1072

Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp

Poore,R.Z. and Bybell,L.. (1988):
Eocene to Miocene biostratigraphy of New Jersey Core ACGS # 4: Implications for regional stratigraphy . U. S. Geological Survey Bulletin 1829 p. 1-22

Spezzaferri,S. and Silva,I.S.. (1990):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263

Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836

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

Nishi,H.. and Chaproniere,G.C.H. (1994):
Eocene-Oligocene subtropical planktonic foraminifers at Site 841.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 135 Eds: Hawkins, J..Parson, L..Allan, J..others p. 245-266

Poag,C.W.. and Commeau,J.A.. (1995):
Paleocene to middle Miocene planktic foraminifera of the southwestern Salisbury Embayment, Virginia and Maryland: biostratigraphy, allostratigraphy, and sequence stratigraphy . Journal of Foraminiferal Research Vol. 25 p. 134-155

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513

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