C. arenaria may refer to: Carex arenaria, the sand sedge, a plant species Catinella arenaria, the sandbowl snail, a small air-breathing land snail species Cicindela arenaria, a ground beetle species native to the Palearctic Europe Croitana arenaria, the inland sand-skipper, a butterfly species endemic to the Northern Territory and South Australia
See also Arenaria (disambiguation)