Rostroconchia es una clase de moluscos extintos que datan del Cámbrico temprano hasta el Pérmico tardío. Inicialmente se creía que eran bivalvos, pero más tarde se clasificaron en su propia clase. Tenían una concha simple en estado de larva, y de adultos eran pseudo-bivalvos cerrando el manto y el pie muscular. Los rostroconchas probablemente eran sedentarios. había unas 1.000 especies. Generalmente eran pequeños, de menos de 2 cm de longitud pero algunos en el Devónico en los Estados Unidos llegaban a hacer 15 cm.

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The Rostroconchia is a class of extinct Molluscs dating from the early Cambrian to the late Permian. They were initially thought to be bivalves, but were later given their own class. They have a single shell in their larval stage, and the adult typically has a single, pseudo-bivalved shell enclosing the mantle and muscular foot. The anterior part of the shell probably pointed downward and had a gap from which the foot could probably emerge. Rostroconchs probably lived a sedentary semi-infaunal lifestyle. There were probably more than 1,000 species of members of this class. Approximately 3 dozen genera and an even greater number of species have been described. Generally, rostroconchs are small, less than two centimeters in length, but larger forms, found in United States Devonian limestones, can grow to a length of 15 cm.

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