Thalassoid

Thalassoid

 

a large lunar crater formation whose dimensions are close to those of circular lunar mare basins but whose bottoms are light-colored and not covered with dark lava.

References in periodicals archive ?
Adaptive radiation of thalassoid gastropods in Lake Tanganyika, East Africa.
The late Cenozoic Thiaridae (Mollusca, Gastropoda, Cerithioidea) of the Albertine Rift Valley (Uganda-Congo) and their bearing on the origin and evolution of the Tanganyikan thalassoid malacofauna.
evidence from the thalassoid gastropods of Lake Tanganyika.