On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Thetys vagina TAN1810

Mike Stukel

T. vagina oozooid. You can see the muscle bands that allow these animals to pump large amounts of water through their bodies very clearly.  To the left is the oral siphon (similar to the mouth), where water enters, and to the right, near the end, is the atrial siphon, where water comes out.