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The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

Published online by Cambridge University Press:  01 March 2018

Shiladri S. Das ,
Sandip Saha ,
Subhendu Bardhan ,
Sumanta Mallick  and
Warren D. Allmon
Shiladri S. Das
Affiliation:
Geological Studies Unit, Indian Statistical Institute, 203, Barrackpore Trunk Road, Kolkata-700108, India 〈shiladri@gmail.com〉〈sandipsaha.ju@gmail.com〉
Sandip Saha
Affiliation:
Geological Studies Unit, Indian Statistical Institute, 203, Barrackpore Trunk Road, Kolkata-700108, India 〈shiladri@gmail.com〉〈sandipsaha.ju@gmail.com〉
Subhendu Bardhan
Affiliation:
Department of Geological Sciences, Jadavpur University, Kolkata-7000032, India 〈sbardhan12@gmail.com〉
Sumanta Mallick
Affiliation:
Department of Geology, Triveni Devi Bhalotia College, Raniganj-713347, India 〈sumanta.geol87@gmail.com〉
Warren D. Allmon
Affiliation:
Paleontological Research Institution, and Department of Earth and Atmospheric Sciences, Cornell University, 1259 Trumansburg Road, Ithaca, New York, 14850USA 〈wda1@cornell.edu〉
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Abstract

Turritellid gastropods are important components of many Cretaceous–Recent fossil marine faunas worldwide. Their shell is morphologically simple, making homoplasy widespread and phylogenetic analysis difficult, but fossil and living species can be recognized based on shell characters. For many decades, it has been the consensus that the oldest definite representatives of Turritellidae are from the Lower Cretaceous, and that pre-Cretaceous forms are homeomorphs. Some morphological characters of the present turritelline species resemble those of mathildoids, but many diagnostic characters clearly separate these two groups. We here describe and/or redescribe—based on examination of more than 2600 near complete specimens—four species from the Upper Jurassic Dhosa Oolite Member of the Chari Formation in Kutch, western India, and demonstrate that they are members of Turritellidae, subfamily Turritellinae, on the basis of diagnostic characters including apical sculptural ontogeny (obtained from SEM study), spiral sculpture, and growth line patterns. The four species are in order of abundance, Turritella jadavpuriensis Mitra and Ghosh, 1979; Turritella amitava new species; Turritella jhuraensis Mitra and Ghosh, 1979, and Turritella dhosaensis new species. The turritelline assemblages occur only on the northeastern flank of the Jhura dome (23°24’47.57”N, 69°36’09.26”E). Age of the Dhosa Oolite has recently been confirmed based on multiple ammonite species. All these points indicate that these fossils are the oldest record of the family Turritellidae—by almost 30 million years—in the world.

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Journal of Paleontology , Volume 92 , Issue 3 , May 2018 , pp. 373 - 387
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Copyright © 2018, The Paleontological Society 

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