Dipsidripella danvillensis Howe & Wallace 1932 (TaxonConcept

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Species Dipsidripella danvillensis Howe & Wallace 1932

Diagnosis / Definition:

Pearson et al. (2006):
DESCRIPTION.- Type of wall: Wall monolamellar, micro- to finely perforate surface smooth to moderately pustulose, hispid to bluntly pustulose, pustules randomly scattered on umbilical and spiral sides of test. Test morphology: Test small, moderately lobate, subquadrate to circular in equatorial outline, axial periphery rounded; chambers globular, coiled in a lour trochospire, increasing moderately in size, 4 ½ - 5 ½ in the final whorl; sutures radial and depressed on umbilical and spiral sides; umbilicus usually narrow and moderately deep; aperture an interiomarginal, umbilical-extraumbilical arch that is narrow and high or broad and low, may or may not be bordered by a narrow, equidimensional lip; a semicircular accessory aperture may occur on the ventral side at the intersection of the spiral andlor penultimate chamber sutures (Pl. 16.8, Fig. 17). Size: Holotype (LSU: HVH 712) maximum diameter 0.11 mm, breadth 0.07 mm; hypotypes maximum diameter 0.11-0.15 mm, maximum breadth 0.05-0.06 mm.

Discussion / Comments:

Pearson et al. (2006):
DISTINGUISHING FEATURES.- This species differs from Praepararotalia inconspicua (Howe) by having a rounded rather than subangular or carinate peripheral margin, a gently convex rather than flattened spiral side, and an interiomarginal rather than areal position of the aperture; differs from D. ? liqianyui n. sp. by its more lobate and broadly rounded equatorial periphery, less flattening of the spiral side, and absence of pustules in the umbilicus; differs from Praepararotalia perclara Loeblich and Tappan by the presence of pustulose ornamentation on both sides, rather than only on umbilical side of the test (e.g., see Liu and others, 1998, pl. l, figs. 1-9, text-fig. 4-2); differs from A. medizzai by its monolamellar wall, hispid, rather than coarsely muricate wall texture, and distinctive, often highly arched aperture. DISCUSSION.- Globorotalia inconspicua aculeata Jenkins is considered a junior synonym of Dipsidripella danvillensis based on morphologic similarity of the two holotypes (Pl. 16.8, Figs. 1-5) and because of nomenclatural priority. Dipsidripella hodisensis Brotea, the type species of Dipsidripella, also falls within the range of morphologic variability of D. danvillensis and is therefore considered a junior synonym (see holotype on Pl. 16.8, Fig. 6). Liu and others (1998) transferred Jenkins's aculeata (=danvillensis) to their new genus Praepararotalia based on the more areal, extraumbilical position of the aperture and similarity in shallow water biofacies distribution. This taxonomic reassignment is no longer considered appropriate because the other species that Liu and others (1998) assigned to Praepararotalia show significant asymmetry in the distribution of surface pustules, with greatest pustule concentrations near the umbilicus, and, in the case of P. inconspicua, coalescence of pustules to form costae on the chamber surface or a peripheral carina. Kucera (1994) compared ontogenetic patterns of test morphology and microstructure for modern microperforate species and lower Oligocene specimens of D. danvillensis (designated as Turborotalia? aculeata) collected from the Pouzdrany Marl in the Polish Carpathians. Results from his measurements of adult specimens demonstrate an overlapping but larger range of pore size in danvillensis (0.5-2.0 µm) relative to modem microperforates (0.5-0.8 µm) and a much lower concentration of pores (11-17 pores/µm² in danvillensis vs. 160- 180 pores/µm² in microperforates). In his species abundance counts he found a strongly inverse relationship between the abundance of danvillensis and the abundance of large globigerinids. As an example, samples with 24-42% larger globigerinids contained less than 2% danvillensis, whereas samples with >85% danvillensis contained 0% larger globigerinids. In the shallowest, lowest salinity samples, Kucera found that D. danvillensis is the only foraminifer species present with a planktonic test morphology. PHYLOGENETIC RELATIONSHIPS.- Uncertain. Although Lui and others (1998) suggest that Praepararotalia aculeata (=D. danvillensis in the present study) evolved from Praepararotalia perclara (Loeblich and Tappan) during the early Eocene, based on morphologic similarity and overlapping stratigraphic ranges, they are separated by a stratigraphic gap spanning the lower Eocene andP perclara is considered a benthic taxon. Restriction of D. danvillensis to shallow shelf depositional environments (e.g., Liu and others, 1998) and similarity of its stable isotopic composition with cooccurring benthic species (see below) suggests that this taxon may have been derived from a benthic ancestor. STRATIGRAPHIC RANGE- Middle Eocene - upper Eocene; Zone E9 E 1 4 . Liu and others (1997) recorded Globigerina? danvillensis (=D. danvillensis) from upper Zone P12 through lower P15 (=Zone E11-E14) in the Atlantic City borehole in the New Jersey coastal margin. In New Zealand Jenkins (1971) recorded Globorotalia aculeata (=D. danvillensis) within the lower upper Eocene, corresponding with the middle of the stratigraphic range of Globigerinatheka index. GEOGRAPHIC DISTRIBUTION.- Restricted to shallow shelf depositional environments at middle to high latitudes. STABLE ISOTOPE PALEOBIOL0GY.- Oxygen and carbon isotope values for well preserved D. danvillensis from upper Eocene core samples drilled on the New Jersey coastal margin are plotted in Figure 16.4 relative to co-occurring benthic and planktonic species. The δ 18O values of D. danvillensis are from 0.5 to 1.0 ‰ more negative than co-occurring benthic species and from 0.3 to 0.7 ‰ more positive than co-occurring subbotinid or turborotaliid planktonic species. The δ 13C values of D. danvillensis are consistently more negative by 0.5 to 1.4 ‰ than co-occurring benthic values, and up to 2 ‰ more negative than co-occurring planktonic species. In one sample the carbon and oxygen isotope values of D. danvillensis plot very close to those of Tenuitella insolita. These data, and the biofacies distribution observations discussed above, indicate that D. danvillensis either lived in a benthic habitat for all or most of its life cycle or it occupied a much deeper level of the water column than co-occurring planktonic foraminifera.

Systematics:

35
Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Cassigerinellidae
    Genus Dipsidripella
     Species Dipsidripella danvillensis

Synonym list:

Pearson et al. (2006):

1932 Globorotalia danvillensis Howe & Wallace. - Howe & Wallace : p.74 pl. 10; fig. 9a-c [upper Eocene, Jackson Group, Danville Landing on the Quachita River, Catahoula Parish, Louisiana, USA]

1966 Globorotalia inconspicua aculeata Jenkins. - Jenkins : p. 1118-1120 fig. 13, no. 119-125 [Bortonian (middle Eocene), Globigerinatheka index index through Globorotalia (Testacarinata) inconspicua Zones, Hampden Beach, South Island, New Zealand]

1971 Globorotalia inconspicua aculeata Jenkins. - Jenkins : p. 111-112 pl. 10; fig. 250-256 [Bartonian through Kaitan Stage (middle-upper Eocene), Globigerinatheka index index through Globorotalia (Testacarinata) inconspicua Zones, Hampden Beach, South Island, New Zealand]

1985 Globorotalia aculeata Jenkins. - Jenkins & Srinivasan : p.807 pl. 2; fig. 4 [upper Eocene, Globorotalia aculeata Zone, DSDP Site 592, Lord Howe Rise, southwest Pacific]

1985 Globorotalia sp. . - Leckie & Webb : p.1116 pl. 16; fig. 10-15 [probably reworked in Recent sediments, DSDP Site 270, Ross Sea, Antarctica]

1987 Globigerina cf. angustiumbilicata Bolli. - Murray & Wright : p.118 pl. 14; fig. 7-8 [upper Eocene, Middle Headon Beds, Whitecliff Hay, Isle of Wright, England]; [not Bolli, 1957]

1988 Globorotalia aculeata Jenkins. - Poore & Bybell : p.17 pl. 3; fig. 7-9 [upper Eocene, Turborotalia cunialensis Zone, U.S. Geological Survey ACGS #4 borehole, Mays Landing, New Jersey, Coastal Plain]

1990 "Tenuitella" aculeata Jenkins. - Malumian : p.382 [Eocene, Man Aike Fm., Santa Cruz Province, YCF SEC-7 borehole, Argentinia]

1991 "Acarinina" aculeata Jenkins. - Nocchi et al. : p.266 pl. 4; fig. 27, 28 [upper Eocene, Zone P15, ODP Hole 703A, Meteor Rise, southern South Atlantic Ocean]

1995 Dipsidripella hodisensis Brotea. - Brotea : p. 31-32 pl. 1; fig. 1-9 [uppermost Eocene-lowermost Oligocene, upper Brebi Marls Fm., Hodis Salai district, northern Transsylvania]

p 1998 Praepararotalia aculeata Jenkins. - Liu et al. : p. 16, 17 pl. 1; fig. 11-13 not pl. 1; fig. 10 [=Praepararotalia inconspicua (Jenkins)]; [middle Eocene, Clairborne Member, Cook Mountain Fm., Couley Creek, Winn Parish, Louisiana]

2006 Dipsidripella danvillensis Howe & Wallace. - Pearson et al. : p.498 pl. 16.8; fig. 1-17 (Pl. 16.8, Figs. 1-3: new SEMs of holotype of Globorotalia inconspicua aculeata Jenkins) (Pl. 16.8, Figs. 4, 5: new SEMS of holotype of Globorotalia danvillensis Howe and Wallace)

Specimen:

Louisiana State University Museum - Louisiana, Inventory number: cat. no. HVH 712

References:

Howe,H.V. and Wallace,W.E. (1932):
Foraminifera of the Jackson Eocene at Danville Landing on the Ouachita, Catahoula Parish, Louisiana . Bull. Louisiana Dept. Conservation Geol. Vol. 2 p. 18-79

Jenkins,D.G. (1966):
Planktonic foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand. . N. Z. J. Geol. Geophys. Vol. 8 p. 1088-1126

Jenkins,D.G. (1971):
New Zealand Cenozoic Planktonic Foraminifera . New Zealand Geological Survey Paleontological Bulletin Vol. 42

Leckie,R.M. and Webb,P.N. (1985):
Late Paleogene and early Neogene foraminifers of Deep Sea Drilling Project Site 270, Ross Sea, Antarctica .
In: Initial Reports of Deep Sea Drilling Project Vol. 90 Eds: Kennett, J.P.von der Borch, C.C..and others p. 1093-1142

Jenkins,D.G. and Srinivasan,M.S. (1985):
Cenozoic planktonic foraminifera from the Equator to the Sub-Antarctic of the Southwest Pacific.
In: Initial Reports of the Deep Sea Drilling Project Vol. 90 Eds: Kennett, J.P.von der Borchand others p. 795-834

Murray,J.W. and Wright,C.A.. (1987):
Palaeogene Foraminiferida and palaeoecology, Hampshire and Paris Basins and English Channel . Special Papers in Palaeontology Vol. 14 p. 1-129

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

Malumian,N.. (1990):
Foraminiferos de la Formacion Man Aike (Eoceno, sureste lago Cardiel) Provincia de Santa Cruz . Asociacion Geologica Argentina, Revista Vol. 45 p. 365-385

Nocchi,M.; Amici,E. and Premoli Silva,I. (1991):
Planktonic Foraminiferal Biostratigraphy and Paleoenvironmental Interpretation of Paleocene Faunas from the Subantartic Transect, Leg 114.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 114 Eds: Ciesielski, P.F.Kristoffersen, Y.Al, E. p. 233-279

Brotea,D.. (1995):
A new planktonic foraminifer in upper Eocene deposits from north Transylvania, Romanian . Journal of Paleontology Vol. 76 p. 31-33

Liu,C.; Olsson,R.K. and Huber,B.T. (1998):
A benthic paleo-habitat for Praepararotalia gen. nov. and Antarcticella Loeblich and Tappan . Journal of Foraminiferal Research Vol. 28 p. 75-90

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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