Thecate hydroids and their medusae 1

Thecate hydroids and their medusae (part 1) Synopsis covers the Haleciidae and minor families.

Part 2 covers the hydroid families with larger colonies Sertulaeiidae, Plumulariidae, Aglaopheniidae and Campanulariidae.

Hydroids and their medusae are amongst the most exquisitely beautiful and intriguing of marine invertebrate groups.