See text Ramonalinidae is an extinct family of marine bivalve molluscs from the late Anisian (early Middle Triassic).

It was an edgewise-recliner with a flattened anteroventral surface (on which it rested) and partially fused valves.

They formed distinctive mud mounds.

This article related to a Triassic animal is a stub.

You can help Wikipedia by expanding it.This article about a prehistoric bivalve is a stub.