Jurassic Bivalve ID

[paleo.wales]

Anyone able to help me classify this bivalve. I interpret it as some sort of Infaunal bivalve but could be totally wrong. 
The specimen was collected at Rhoose point on the Jurassic Heritage Coast Vale of Glamorgan, South Wales from the Blue Lias formation. 

[caterpillar]

Maybe Pholadomya

[Ludwigia]

I'll go along with that.