CATALOG OF ORIGINAL DESCRIPTIONS: Truncorotalia tosaensis subsp. acrotenes 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 -> T -> Truncorotalia -> Truncorotalia tosaensis acrotenes
Other pages this level: T. crassula complanata, T. gabrieliani, T. marginodentata aperta, T. pseudocrassa hybrida, T. sphericomiozea capitona, T. tosaensis acrotenes, T. truncatulinoides nana

Truncorotalia tosaensis acrotenes

Citation: Truncorotalia tosaensis subsp. acrotenes Fordham 1986
Rank: sub-species
Type locality: DSDP 208-4-4 74-76 cm.
Type age (chronostrat): Globorotalia tosaensis zone; Upper Pliocene.
Type specimens: UQfá 72487.
Type repository: Brisbane, Australia; U Queensland Univ.

Current identification:

Original Description
Very large, robust; low dextral trochospire, tight. Equatorial outline circular, virtually nonlobate; lateral outline highly umbilicoconvex, dorsal side flat, ventral side highly vaulted. Chambers angular-conical, closely appressed, 4 in final whorl; increase moderate. Dorsal view: chambers very long concentrically, flat to concave; sutures flush; intercameral sutures radial but may be quickly curved posteriorly on periphery; last intercameral suture limbate; other features obscured by thickening. Ventral view: chambers vaulted; intercameral sutures curved anteriorly then radial, flush; umbilicus wide, square. Lateral view: weakly keeled periphery; ventral face strongly convex; umbilical shoulder subacutely recurved, very high, very close to umbilicus; terminal and apertural faces reclined; aperture an umbilical--extraumbilical interiomarginal very low slit, very slightly raised adjacent to periphery. Wall densely and finely perforate, smooth but heavily encrusted.

Size: Length, 635 µm; width, 600 µm; height, 485 µm.

Etymology: Greek, akrotenes, stretching high.

Extra details from original publication
Description based on: Seven specimens.
Holotype fig.: Fordham 1986 Pl. 24, fig. 6.


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


Truncorotalia tosaensis acrotenes compiled by the pforams@mikrotax project team viewed: 30-7-2021

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