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.
Keywords from Image Description:
Botryllus schlosseri . en Botryllus schlosseri Pallas magnified showing two systems of and ascidiozooids one ascidiozooid extracted branchial orifice atrial orifice branchial sac stomach biodiversitylibrary org page Guide to the shell and starfish galleries of the British Museum British Museum Custom marker PDold Uploaded