CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina multicamerata Guasti and Speijer 2008

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 -> A -> Acarinina -> Acarinina multicamerata
Other pages this level: A. acarinata, A. boudreauxi, A. clara, A. compacta, A. crassaformis simulata, A. discors, A. falsospiralis, A. inaequiconica, A. indolensis, A. intermedia, A. interposita, A. kiewensis, A. mattseensis alticonica, A. mcgowrani, A. microsphaerica, A. multicamerata, A. multiloculata, A. pentacamerata acceleratoria, A. pentacamerata camerata, A. pentacamerata erevanensis, A. planodorsalis, A. praecursoria, A. primitiva, A. proxima, A. pseudosubsphaerica, A. pseudotopilensis, A. punctocarinata, A. quadratoseptata, A. rotundimarginata, A. rugosoaculeata, A. subintermedia, > >>

Acarinina multicamerata

Citation: Acarinina multicamerata Guasti and Speijer 2008
Rank: Species
Type locality: Gebel Duwi, 26° 05' N and 3° 07' E, 12 km east of the town of Quseir (Red Sea Coast, Egypt).
Type age: Ypresian
Type sample and level: Sample BI3+8–12, collected from the 30 cm thick pink coprolite-rich marl bed, 15m above the base of the Esna Formation. This bed appears to be an equivalent to Dababiya Quarry bed 3 in the GSSP section of Dababiya (Dupuis et al., 2003).
Holotype Repository: London, UK; NHM
Type & figured specimens: Holotype (PF 67590) and three paratypes (PF 67591, PF 67592, PF 67593)

Current identification/main database link:


Original Description
Test coiled in a low trochospire, containing 6–9 chambers in the final whorl. The chambers are globular and gradually increase in size. Dorsally flattened tests with rounded and lobate peripheral margin. The umbilicus is generally deep. The sutures are radial on both sides and strongly depressed, particularly on the ventral side. The aperture is an interio-marginal, extraumbilical–umbilical low elongate arch extending from the umbilicus to the periphery. Wall texture: non spinose, muricate.

Size: Maximum diameter: 253 μm; minimum diameter: 218 μm; thickness: 118 μm.

Etymology: The species name multicamerata derives from the numerous chambers in the final whorl, which characterize this taxon.

Extra details from original publication

Distribution. Tropical-subtropical latitudes.

Remarks. Acarinina multicamerata differs from A. sibaiyaensis in several features. A. multicamerata has a larger number of chambers per whorl and the outline is overall more rounded. The chambers increase more gradually in size compared to A. sibaiyaensis. In some specimens, the wall texture of A. multicamerata is dominated by the large pores, instead of being covered with spiky pustules. The umbilicus is generally narrower in A. sibaiyaensis, resulting in a more tightly coiled test compared to A. multicamerata. The number of chambers (6), a rounded outline and a wider umbilicus are also evident in the specimens of Berggren et al. (2006, pl. 9.21, figs 9–14), suggesting the attribution of these specimens to A. multicamerata. All the other specimens seem to represent a transitional form between A. sibaiyaensis and A. multicamerata.

Origin of the species. El-Naggar suggested that A. sibaiyaensis evolved from G. perclara Loeblich & Tappan (1957), which already occurred in the Danian, but it has been reinterpreted as benthic foraminifera by Liu et al. (1998). Instead, Kelly et al. (1998) suggested that A. sibaiyaensis (=A. multicamerata) evolved from A. soldadoensis. Berggren et al. (2006) proposed Acarinina esnehensis as the ancestor of A. sibaiyaensis. The possibility that A. sibaiyaensis could derive from A. esnehensis is not excluded, although the morphology is distinctively different. It is suggested that A. multicamerata is derived from A. sibaiyaensis, as evidenced in the similar wall-textures and in the occurrence of transitional specimens. A. multicamerata diverged from the parent species to adapt to different environmental conditions.

References:

Guasti, E. & Speijer, R. P. (2008). Acarinina multicamerata n. sp. (Foraminifera): a new marker for the Paleocene–Eocene thermal maximum. Journal of Micropalaeontology. 27: 5-12. gs


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Acarinina multicamerata compiled by the pforams@mikrotax project team viewed: 15-12-2019

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