Catalog - Catapsydrax indianus

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Catapsydrax indianus

Citation: Catapsydrax indianus Spezzaferri & Pearson 2009

Type specimens: Pl. 1, Figs. 1a–3c; holotype pl 1 f1, C9820.

Type sample (& lithostrat): ODP 115-709B-21-6, 78–80 cm.; Nannofossil ooze.

Type age (chronostrat): near Oligo-Miocene boundary

Type locality: Mascarene Plateau, Indian Ocean; water depth 3,040.8 m, coordinates 03°54.99S, 60°33.19E.

Type repository: Basel, CH; Natural History Museum

The size of this species ranges from medium to large (0.25 mm); however, large specimens are generally more abundant. It displays a globigeriniform coiling mode with a moderately low trochospire consisting of about three whorls. The profile is subcircular and lobate with a rounded peripheral margin. Four subspherical chambers gradually increasing in size as added are present in the last whorl. The sutures are depressed and radial on both sides. The umbilicus is moderately deep and covered by a bulla in adult specimens. The primary aperture is a small and semicircular low umbilical arch, visible only when the bulla is broken or missing. Five accessory apertures, four opening over the sutures and one opening over the central part of the antepenultimate chamber, characterize this species. The size of the accessory apertural opening over the antepen- ultimate chamber varies in size from very small to wide, as in Plate 1, Figures 3a–b, or very irregular, as in Plate 1, Figure 2. The wall texture is strongly cancellate, with hexagonal pores located in deep pore pits. Although spines have not been observed in the studied specimens, Olsson and others (2007) regarded the genus Catapsydrax as probably spinose. When strong recrystallization overprints the original cancellate pattern, the wall texture shows euhedral crystals and inward growth of crystals replacing the earlier microgranular wall. Generally, the bulla is less coarsely cancellate than the rest of the test.

From the Indian Ocean, where it is very abundant.

1979 Catapsydrax dissimilis subsp. 1, Molina, p. 289, Pl. 25, figs. 3A– D.
1990 Globorotaloides sp. 2, Premoli Silva and Spezzaferri, Pl. 3, figs. 7a–c.
1994 Catapsydrax sp. 1, Spezzaferri, Pl. 34, figs. 4a–b.

Remarks. This species differs from Catapsydrax dissimilis, Catapsydrax ciperoensis, and Catapsydrax unicavus in having five infralaminal accessory apertures instead of two, three to four, or one, respectively. It differs from C. unicavus by its more lobate profile.

Distribution. It ranges from the lower third of Zone P22 of Blow (1979), which corresponds to Zone O6 of Berggren and Pearson (2005, 2007), to Zone N5 of Blow (1979).

References:

Coxall, H. K. & Spezzaferri, S. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Catapsydrax, Globorotaloides, and Protentelloides. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 4): 79-124. gs

Spezzaferri, S. & Pearson, P. N. (2009). Distribution and ecology of Catapsydrax indianus, a new planktonic foraminifer index species for the Late Oligocene–Early Miocene. Journal of Foraminiferal Research. 39(2): 112-119. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Catapsydrax indianus Spezzaferri & Pearson 2009

Catapsydrax indianus

References:

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