channeled topsnail

Calliostoma annulatum est une espèce de mollusques gastéropodes marins. Elle prolifère sur les stipes et frondes d'algues de la côte ouest de l'Amérique du Nord. Historique De même que Calliostoma ligatum et Calliostoma canaliculatum, Calliostoma annulatum fut découverte par James Cook.

Calliostoma canaliculatum, common name the channeled topsnail, is a species of small sea snail with gills and an operculum, a marine gastropod mollusk in the family Calliostomatidae, the calliostoma top snails. The name of the species Calliostoma canaliculatum (Sasao & Habe, 1973) is preoccupied in Calliostoma, by Calliostoma canaliculatum (Lightfoot, 1786), but not in Tristichotrochus, which is where it is placed by some authors. It is currently a secondary homonym but it has not replaced the preoccupied name because the replacement name would be synonymized sooner or later.

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