See the Atlas of Eocene Planktonic Foraminifera (Huber and others, 2006) for previous discussion. Here we add Globigerinella evoluta Subbotina in synonymy following new observations of the type material (see Chapter 20, this volume). We include within our concept forms with four to six chambers in the final whorl, forms with or without supplementary apertures, and forms with globular or radially extended chambers. Clearly there is much scope for taxonomic subdivision should detailed morphometric, stratigraphic, and biogeographic studies be undertaken. [Pearson et al. 2018]
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. [Huber et al. 2006]
Kucera (1994) compared ontogenetic patterns 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 ½m) relative to modern microperforates (0.5-0.8 ½m) and a much lower concentration of pores (11-17 pores/½m2 in danvillensis vs. 160-180 pores/½m2 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. [Huber et al. 2006]
Catalog entries: Globigerina danvillensis, Globorotalia inconspicua aculeata, Dipsidripella hodisensis, Globigerinella evoluta
Type images:Distinguishing features:
Parent taxon (Dipsidripella): monolamellar wall covered with randomly scattered short, blunt to hispid pustules
This taxon: Test low trochospire, small, moderately lobate, increasing moderately in size, 4-6 in final whorl; sutures radial and depressed; umbilicus narrow to broad and moderately deep; aperture high arch; a semicircular accessory aperture may occur on the spiral side.
Morphology:
Wall type:
Size:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Globular | coiling axis: | Low | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Sutural |
spiral sutures: | Weakly depressed | umb depth: | Deep | wall texture: | Moderately pustulose | shell porosity: | Microperforate: <1µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.5-5.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution
Isotope paleobiology
Phylogenetic relations
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 and P. 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 co-occurring benthic species (see below) suggests that this taxon may have been derived from a benthic ancestor. [Huber et al. 2006]
Geological Range:
Notes: Middle Eocene (Liu and others, 1998) to lower Oligocene, probably lowermost part of Zone O2. At the time of publication of the Atlas of Eocene Planktonic Foraminifera, the confirmed stratigraphic range was restricted to the middle and upper Eocene although a single specimen from the lower Oligocene was illustrated (Huber and others, 2006, plate 16.8, fig. 15). Here we confirm its range into the Oligocene and illustrate Oligocene specimens from various localities. At ODP Site 647, with moderate sampling intensity, its disappearance is at the same level as that of Pseudohastigerina naguewichiensis (H.K. Coxall, unpublished data). The latter is absent from the Ottenthal Fm., which is probably lowermost Zone O2. Its absence from younger clays and marls in the Paratethys region suggest extinction somewhere in Zone O2, although this has not so far been observed in any continuous section. [Pearson et al. 2018]
Last occurrence (top): within O2 zone (30.28-32.10Ma, top in Rupelian stage). Data source: Pearson et al. 2018
First occurrence (base): within E9 zone (43.23-43.85Ma, base in Lutetian stage). Data source: Eocene Atlas
Plot of occurrence data:
Primary source for this page: Pearson et al. 2018 - Olig Atlas chap.16 p.433; Huber et al. 2006 - Eocene Atlas, chap. 16, p. 496
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Dipsidripella danvillensis compiled by the pforams@mikrotax project team viewed: 11-12-2024
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