Description ²

A relatively large shoulderband snail that is widely distributed in central California. It often co-occurs with H. nickliniana, but they can be distinguished by the fact that H. arrosa usually has an open umbilicus and H. nickliana has a covered umbilicus. H. nickliniana also has a unique pattern of regular, oblique bumps on its shell, visible with a close macro photo or a hand lens, while the sculpture of H. arrosa tends to be more "malleate," looking like metal beaten with a hammer.

Sources and Credits

1. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
2. (c) Ken-ichi Ueda, some rights reserved (CC BY-SA)

More Info

• iNat taxon page
• Animal Diversity Web
• Biodiversity Heritage Library
• BOLD Systems BIN search
• CalPhotos
• Global Biodiversity Information Facility (GBIF)
• NatureServe Explorer 2.0
• SeaLifeBase
• World Register of Marine Species

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