Your specimens are much interesting specially the colour pattern, this type of colour is seen in M. lusoria, So, it may not be M. meretrix. Also you have not mentioned the exact collection locality and size of the specimen, please go through the Hornell (1917) and Huber (2010, 2015) for confirmation of the species. Best of Luck.

Thank you For your valuable Information..This Specimen Collected from Andhra Coast

Yes! It could be Meretrix lusoria. Best Gianluigi

Thank you Sir

Agreed on Meretrix lusoria.

Thank you for Your Support

I agree this is venerid, and Meretrix seems a good candidate taxon but what about  a species of the genus Circe (I am not certain about the distribution of the individual species of this genus)?

Thank you for your valuable answers..Meretrix meretrix is reported in India by  Hornell (1917).Henk Dekker Sir i sent one Paper to you,and coming to this specimen this type of colour patterns wot see in meretrix casta.and meretrix lusoria has The shell has fine concentric growth lines and a relatively smooth surface. Color is highly variable, from white and brown concentric bands to fine reddish-brown or dark-brown mottling, forming dotted lines, and W-shaped markings (Yamakawa et al. 2008; description from photos in Zhang et al. 2012)

Estimado Podrias conectarte con el Dr. Carlos Paredes a su email: [email protected]

Thank you Martin Sir for your Support.

 It is Meretrix meretrix .....may name or sub species if it is new....