CATALOG OF ORIGINAL DESCRIPTIONS: Turborotalia cambayensis Mukhopadhyay 2005

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 -> Turborotalia -> Turborotalia cambayensis
Other pages this level: T. altispiroides, T. bannerblowi, T. bykovae, T. cambayensis, T. centralis perfecta, T. clemenciae, T. czeczvaensis, T. hirsutoides, T. kotarduensis, T. lata, T. munda franzenaui, T. pseudoampliapertura nukhulensis, T. pseudoampliapertura sinaiensis, T. pseudobesa, T. vagalkhodensis

Turborotalia cambayensis

Citation: Turborotalia cambayensis Mukhopadhyay 2005
Rank: Species
Type locality: About 0.5 km south of Dinod village in Surat District.
Type age (chronostrat): P17-P18 Zone, Eocene-Oligocene transition
Type sample (& lithostrat): Marlite (s. no. 43, sl.II) from the upper part of the Amravati Formation.
Type specimens: Pl. III, figs 1-3, 4, 6-9, 14, 17, 18; Figured specimen Pl. III, figs 1-3, Laboratory registration no T-12/98/P20/I. Other material studied : Seven specimens from sl I, 17 from sl. II and three from sl III.
Type repository: Kolkata; Palaeontology Division, Geological Survey of India, 15, Kyd Street, Kolkata-700016, India

Current identification:

Original Description
Diagnosis : Almost plano-convex compressed test, entire peripheral outline, strongly perforate peripheral keel, faint dorsal sutures, interiomarginal extraumbilical- peripheral small aperture and secondary sutural fissures on the ventral side.
Description: Test medium, low trochospiral, lenticular, nearly plano-convex, dorsal side nearly flat, ventral side strongly convex resembling ʻvʼ shape ; peripheral outline subcircular in dorsal view, entire non-lobate; peripheral margin acute blunt tipped, with a porous keel all along the margin ; early spire indistinct ; 4 rapidly enlarging longer than high chambers in the last whorl, spiral and septal sutures faint; in peripheral view the shoulder of last chamber between its dorsal and ventral surfaces acute, umbilicus closed ; on the ventral side sutures fairly wide, early sutures indistinct to radial, later strongly curved; aperture interiomarginal, extraumbilical-peripheral small arch; structures resembling thin fissures appear along the ventral sutures. Surface finely perforate, perforations finer and less dense on the peripheral band; very fine pore-like structure on the ventral sutures.

Etymology: After Cambay (Khambhat) in Bhavnagar District, Gujarat, India

Extra details from original publication
Remarks: A little variation is recorded in the shape of test, aperture and perforation. Turborotalia cambayensis n. sp. was originally recognized as Turborotalia sp. A and was differentiated from the resembling T. cunialensis mainly on the basis of its apertural aspects. After observing wide variation in the aperture in T. sp. A assemblage, forms having interiomarginal extraumbilical-peripheral thin aperture are distinguished as Turborotalia cambayensis n. sp. It resembles T. cunialensis in subtriangular shape in side view, acute and keeled peripheral margin and faint dorsal sutures. However, in T. cambayensis the small aperture never extends up to the umbilical part and its peripheral band appears thicker. The two forms occur almost successively in sections I & II. Other morphological features remaining almost same in the two forms a phyletic link in between is surmised with a shift in the apertural position.

Distribution: In sl. I & II this species first appears towards the upper part of the T. cunialensis Zone (P17, Upper Eocene) and ranges in the overlying T. cambayensis Zone (P17-P18 to P18, Early Oligocene) and T. kotarduensis Zone (P 19, Early Oligocene).


Mukhopadhyay, S. K. (2005). Turborotalia cerroazulensis group in the Paleogene sequence of Cambay Basin, India with a note on the evolution of Turborotalia cunialensis (Toumarkine & Bolli). Revue de Paléobiologie. 24: 29-50. gs V O


Turborotalia cambayensis compiled by the pforams@mikrotax project team viewed: 30-7-2021

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