CATALOG OF ORIGINAL DESCRIPTIONS: Obandyella ventriosa subsp. evexa Fordham 1986

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> O -> Obandyella -> Obandyella ventriosa evexa
Other pages this level: O. ventriosa astricticamerata, O. ventriosa evexa

Obandyella ventriosa evexa

Citation: Obandyella ventriosa subsp. evexa Fordham 1986
Rank: sub-species
Type locality: DSDP 208-14-4 74-76 cm.
Type age (chronostrat): Globigerina nepenthes zone; Upper Miocene.
Type specimens: UQF 72443.
Type repository: Brisbane, Australia; U Queensland Univ.

Current identification:


Original Description
Moderate in size, fairly robust; slightly elevated sinistral trochospire, tight. Equatorial outline circular though slightly oval, weakly lobate; lateral outline moderately convex dorsally, moderately truncated ventrally. Chambers angular-truncate, closely appressed, at least 11 in total, in final whorl; increase moderate; final chamber reduced. Dorsal view: chambers longer concentrically, barely inflated; sutures generally flush; intercameral sutures directed anteriorly then recurved posteriorly 1/3 toward periphery, nonlimbate, tend to be depressed distally as posterior portion of next chamber is inclined below anterior portion of previous chamber. Ventral view: chambers moderately highly inflated; intercameral sutures depressed, curved posteriorly and then may be recurved anteriorly, producing a slightly sinuous shape, meet at tight umbilicus; aperture umbilical--extraumbilical, interiomarginal, low, with a thin lip. Lateral view: dorsal side of final chamber flat, slightly concave; dorsoperipheral shoulder rounded but compressed; ventral face and terminal face concave; umbilical shoulder smoothly rounded. Wall smooth, densely and finely perforate; pustules near aperture.

Size: Length, 360 µm; width 350 µm; height, 250 µm.

Etymology: Latin, evexus, rounded at the top.

Extra details from original publication
Description based on: Nine specimens.
Holotype fig.: Fordham 1986 Pl. 21, fig. 27.

References:

Fordham, B. G. (1986). Miocene-Pleistocene planktic foraminifers from D.S.D.P. Sites 208 and 77, and phylogeny and classification of Cenozoic species. Queensland, Australia. 1-224. gs


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Obandyella ventriosa evexa compiled by the pforams@mikrotax project team viewed: 30-7-2021

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