Spondylus subcostulatus Stoliczka, 1871
STOLICZKA, F. 1870-1871. Cretaceous fauna of Southern India. III. The Pelecypoda, with a review of all known genera of this class, fossil and recent. Memoirs of the Geological Survey Of India. Paleontologia Indica, 537 p., pls. 1-50. [p. 449, pl. 33, fig. 8; pl. 34, fig. 2]
1871 Spondylus subcostulatus Stoliczka, 1871
F. Stoliczka, 1870-1871, plates 33, 34.
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«Sp. valva inferiore tumida, convexa, ad umbonem plus minusve late affixa, radiatim costellata et concentrice striata, striis sulcis nonnullis profundioribus intersectis, hand lamellosis; valva supera elongate, vel late, ovata, convexa, ad umbonem saepe gibbosa, radiatim costulata, costulis aequalibus, haud tuberculatis, interstitiis aut aequidistantibus aut angustioribus; auriculis inaequalibus, Iaevigatis, auricula postica minore, angusta, margine superiore valde obliqua.
The form of the shell is somewhat variable in this species; it is either elongately or roundly ovate, sometimes irregular, evidently depending upon the surface of the object on which the lower valve was sessile. The numerous, rather fine, and equal ribs, without any larger tubercles, and the smooth unequal ears of the upper valve, readily distinguish the species from others. The furrows separating the ribs are either narrower than the ribs, or they equal them in width; but these changes vary greatly with the state of preservation of the surface. A closely allied European species is Spondylus globulosus, d'Orb., only differing from the Indian form by a little more distant radiating ribs and comparatively larger ears.
Localities.— East of Parally, Moraviatoor, Odium, in yellowish compact or sandy limestone. Formation.—Ootatoor group.» FERDINAND STOLICZKA, 1871
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«Remarks: Stoliczka (1871) recorded it from the Utatur Stage, and the present record from Ariyalur Stage, therefore, extends its range from Utatur to Ariyalur (Middle) and is yet to be reported from Trichinopoly Stage. Hayden (1913-14) material is not however, available for study, but the specimens from parts of Tibet are often referred to as S. rouaulty d'Arch. & Haime.»
LAKSHMINARAYANA , K. V. & C. S. ROY. 1978. Revision of the genus Spondylus Linnaeus (Pelecypoda: Mollusca) from Cretaceous beds of Trichinopoly (S. India) with notes on related species. Bulletin of the Zoological Survey of India, 1 (3): 211-220, pl. 2. [p. 219]
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Spondylus (Eltopera) subcostulatus Stoliczka; K. V. Lakshminarayana & C. S. Roy, 1978, Revision of the genus Spondylus Linnaeus (Pelecypoda: Mollusca) from Cretaceous beds of Trichinopoly (S. India) with notes on related species, plate 2, figure I.
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