It is characterized by a large shell between about 150–200 mm in triangular or wedge, the leaflets have ornamentations forming rows 10-20 tubular radial spiny projections which are often slightly curved.

[1][2][3] For the Venezuelan Caribbean has been appointed to the coasts of the states of Vargas, Miranda, Anzoátegui, Sucre and Nueva Esparta.

[1][2][4][5] Atrina seminuda, is an endobenthic inhabitant, usually secured by a strong byssus secreted by the animal in rocks and gravel substrate in areas of high energy.

[2] Associated with the outer faces of the leaflets of Atrina seminuda usually inhabit a range of fouling organisms among them being common gastropod mollusks, bivalves and chitons.

[6] Venezuelan folk tradition on its shores this bivalve is known under several names like so: rompechinchorro,[1] hacha,[1] cocha abanico,[1] papa reina[7] y cucharon[8]