New subfamily Indovolutinae and other volutids (Volutidae, Gastropoda) from the Eocene of Kutch, western India and their paleobiogeographic implications

Seven species belonging to the gastropod family Volutidae are reported for the first time from Kutch, Gujarat, India. They arePrestrombusaff.Prestrombus rockeiCox, 1931,Indovoluta humberti(d'Archiac and Haime, 1854),Indovoluta multidentata(d'Archiac and Haime, 1854),Involuta daviesiCox, 1931,Involuta coxinew species,Athleta(Volutocorbis)harnaiensisCox, 1931, andLyriacf.Lyria punjabensisEames, 1952. Indovolutinae new subfamily, constituted of the Paleogene generaPrestrombusDouvillé, 1929,IndovolutaEames, 1956,InvolutaCox, 1931, andLyrischapaAldrich, 1911, and the Cretaceous genusGosaviaStoliczka, 1865, is proposed. These forms have elaborate development of columellar plaits. All of these genera evolved in the western part of the Indian subcontinent. They, exceptLyrischapa, also largely remained restricted to this area.Lyrischapaflourished in the Americas after possibly migrating through the southern margin of the relict Tethys Ocean and crossing the Atlantic Ocean. It is argued that the geographic and temporal restriction of this new subfamily was due to lecithotrophic larval development.UUID:http://zoobank.org/14bc056f-1d2e-4674-b624-9eb8e856a1f0