Clavatorella aff. suturanii Giannelli and Salvatorini

Hanagata, S & Nobuhara, T, 2015, Illustrated guide to Pliocene foraminifera from Miyakojima, Ryukyu Island Arc, with comments on biostratigraph, Palaeontologia Electronica (Cambridge, England) 33 (8), pp. 1-142 : 42

publication ID

https://doi.org/ 10.26879/444

persistent identifier

https://treatment.plazi.org/id/A029445F-E908-FFAD-4BEF-BFE677A2A37B

treatment provided by

Felipe

scientific name

Clavatorella aff. suturanii Giannelli and Salvatorini
status

 

Clavatorella aff. suturanii Giannelli and Salvatorini

Figures 15.3, 15.4 View FIGURE 15

Compared with:

1976 Clavatorella suturanii Giannelli and Salvatorini , p. 168, pl. 1, fig. 1.

1985 Clavatorella suturanii Giannelli and Salvatorini — Bolli and Saunders, 1985, p. 255, fig. 45.3.

2004 Clavatorella sp. 1 — Hanagata, pl. 3, fig. 9.

Diagnosis. Small species with four to four and a half, slightly elongated chambers in the final whorl, moderately perforated smooth surface without ornament, aperture small interiomarginal U-shaped opening from umbilicus to near the periphery. Outer margin of chambers is lobulate and occasionally apiculate.

Remarks. This form is distinguishable from C. suturanii in having less inflated and less lobulate chambers. Kadar (1975, pl. 8, fig. 59) illustrated a morphotype of Clavatorella (Clavatorella) bermudezi (Bolli) that is somewhat similar to the present form, but differs in having more elongated chambers and an umbilicus-oriented aperture. Clavatorella suturanii and C. bermudezi have both been recorded from the Miocene; thus the present form is probably a descendant.

Occurrence. Common in the Yonahama Formation, sporadic in the Minebari Formation.

Kingdom

Chromista

Phylum

Foraminifera

Class

Globothalamea

Order

Rotaliida

Family

Globorotaliidae

Genus

Clavatorella

Loc

Clavatorella aff. suturanii Giannelli and Salvatorini

Hanagata, S & Nobuhara, T 2015
2015
Loc

Clavatorella suturanii

Bolli, H. M. & Saunders, J. B. 1985: 255
1985
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