The diagnostic characters of the Asterinidae species
Asterina atyphoida H.L. Clark from southern Australia and
Asterina gibbosa (Pennant) from the Atlantic, type species of
AsterinaNardo, are reviewed.
Asterina atyphoida is referred to
Meridastra gen. nov., with four other species:
Meridastra fissura sp. nov. and
Meridastra nigranota sp. nov. from southern Australia,
Meridastra rapa sp. nov. from the central south Pacific, and
Meridiastra modesta (Verrill) from the Pacific coast of Panama and Mexico.
Asterina augustincasoi Caso is synonymised with
Meridastra modesta (Verrill).
Asterinides Verrill is recognized as a valid genus.
Meridastra fissura is fissiparous.
Meridastra is distributed from southern Australia to the Pacific coast of Mexico and Panama. A key is provided for the species of
Meridastra.