This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Valvata virens operculum. drawing of the operculum of Valvata virens Dall archive org Alaska Volume XIII Land and Fresh Water Mollusks New York Daubleday Page Complany pages page Dall public domain PDold Valvatidae
Page 2023 Free-images.com. All images are Public Domain