Alternative spelling: Rasia
Parent taxon: Anadara according to J. A. Todd 2001
Sister taxa: Anadara (Anadara), Anadara (Caloosarca), Anadara (Cunearca), Anadara (Diluvarca), Anadara (Esmerarca), Anadara (Grandiarca), Anadara (Larkinia), Anadara (Lunarca), Anadara (Mabellarca), Anadara (Potiarca), Anadara (Sectiarca), Anadara (Tegillarca), Anadara (Tosarca), Anadara aequicostata, Anadara baughmani, Anadara callicestosa, Anadara campsa, Anadara craticulata, Anadara crebricostata, Anadara cretacea, Anadara dasia, Anadara daviesi, Anadara garoensis, Anadara gourae, Anadara guayubinica, Anadara halidonata, Anadara hermidermos, Anadara kroensis, Anadara magnoliana, Anadara molengraaffii, Anadara nugax, Anadara obliquidens, Anadara panensis, Anadara preangerensis, Anadara prephina, Anadara protracta, Anadara quilonensis, Anadara riogurabonica, Anadara suboblonga, Anadara trapezia, Anadara woodringi, Arca (Anadara) santana
Subtaxa: Anadara (Rasia) actinophora, Anadara (Rasia) andrewsi, Anadara (Rasia) athroa, Anadara (Rasia) bravardi, Anadara (Rasia) carmenensis, Anadara (Rasia) cercadica, Anadara (Rasia) charcoazulensis, Anadara (Rasia) concinna, Anadara (Rasia) corcupidonis, Anadara (Rasia) cornellana, Anadara (Rasia) costaricensis, Anadara (Rasia) dariensis, Anadara (Rasia) democraciana, Anadara (Rasia) emarginata, Anadara (Rasia) fissicosta, Anadara (Rasia) formosa, Anadara (Rasia) golfoyaquensis, Anadara (Rasia) guayubinica, Anadara (Rasia) honensis, Anadara (Rasia) inaequilateralis, Anadara (Rasia) lienosa, Anadara (Rasia) lita, Anadara (Rasia) medioamericana, Anadara (Rasia) mirandana, Anadara (Rasia) mississippiensis, Anadara (Rasia) sechurana, Anadara (Rasia) springvalensis, Anadara (Rasia) tamarana, Anadara (Rasia) tirantensis, Anadara (Rasia) wiedenmayeri, Anadara (Rasia) zuliana, Rasia arata
Type: Arca formosa
Ecology: facultatively mobile epifaunal suspension feeder