Catalog - Globorotalia crassaconica Catalog - Globorotalia crassaconica

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia crassaconica Hornibrook 1981

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 -> G -> Globorotalia -> Globorotalia crassaconica
Other pages this level: << < G. centralis, G. cerroazulensis cunialensis, G. cerroazulensis pomeroli, G. cerroazulensis possagnoensis, G. challengeri, G. chapmani, G. cibaoensis, G. cocoaensis, G. collactea, G. conica, G. conicotruncata, G. conomiozea, G. conomiozea mons, G. convexa, G. crassacarina, G. crassaconica, G. crassacrotonensis, G. crassaformis ronda, G. crassata aequa, G. crassula, G. crater, G. crimensis, G. crosswicksensis, G. crotonensis, G. crozetensis, G. crystalriverensis, G. cushmani, G. dalii, G. decorata, G. dehiscens, G. delrioensis> >>

Globorotalia crassaconica

Citation: Globorotalia crassaconica Hornibrook 1981
Taxonomic rank: species
Type specimens: Register No. TF1591.: Holotype and 7 paratypes. Register No. TF1591. Topotypes will be deposited with the British Museum (Natural History) London and the USNM
Type age (chronostrat): Waipipian (Late Pliocene).
Type locality: N116/f493, F5408, grid ref. X19/152295, tuffaceous mudstone exposed on northern side of Wairoa-Gisborne main highway, at entrance to Tahaenui Station, immediately west of road bridge over Tahaenui River.
Type repository: Lower Hutt; New Zealand Geological Survey

Current identification/main database link: Globorotalia crassaconica Hornibrook, 1981


Original Description

Medium size, markedly plano-convex, triangular and conical in cross section, chambers sharply angled and rising to a peak in the umbilical area, ventral sutures gently recurved, dorsal sutures (spiral side) elongate and abruptly recurved at the junction of the chambers, periphery with a thin keel or rim, surfaces densely and coarsely hispid, aperture a low slit with a thin lip. The predominant coiling direction is variable, but mostly dominantly dextral populations have been obsrved.

Size:
Holotype, diameter, 0.42 mm.

Extra details from original publication
Remarks: A fairly typical population is present in sample N106/f750 from the limestone at the base of Opoiti Formation in the Mangapoike River section. The species is present throughout the formation and also in the Waipipian mudstone overlying the Whakapunake limestone (containing the index Waipipian mollusc, Chlamys (Phialopecten) triphooki marwicki) exposed further downstream. Particularly good examples of G. crassaconica are in the mudstone overlying the Whakapunake limestone near Nuhaka.
This species is present in DSDP Site 284, cores 10-12. A comparison with G. crassaformis from the type samples (N116/f493) is well shown in Fig. 9a-c, s-u. G. crassaconica is distinctly more angular and planoconical with a distinct thin peripheral keel. In the East Coast Basin it coils dextrally, contrasting with G. crassaformis which coils predominantly sinistrally within this time interval.

Range: Opoitian-Waipipian (Early-Late Pliocene).

References:

Hornibrook, N. d. B. (1981). Globorotalia in the late Pliocene and early Pleistocene of New Zealand. New Zealand Journal of Geology and Geophysics. 24: 263-292. gs


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Globorotalia crassaconica compiled by the pforams@mikrotax project team viewed: 13-11-2025

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