Succinea caduca

Succinea caduca has an approximately oval-shaped, fragile shell, about a third of an inch in length and a fifth of an inch in breadth. This shell has about two and a half whorls with a prominent spire, and is "horn color".

Succinea caduca was first described as inhabiting the island O'ahu in 1848, but have since been found to inhabit six Hawaiian islands (O'ahu, Lāna'i, Mokoka'i, Kaua'i, Maui, and Hawai'i) in a field survey conducted from 2004–2005. They are the only species in clade B of succineid species to inhabit more than one island. They live at the coast, and are commonly seen in coastal gullies after heavy rain. An experiment found that they could survive 12 hours of immersion in sea water, indicating they may have been able to move between islands by riding on materials drifting in the water. S. caduca inhabits relatively arid habitats.