Leptothecata Cornelius 1992

The gonangia arise from the central stalk of a fernlike spray. They release sperm that fertilize retained eggs. These eggs develop into planula larvae which are released.

Obelia colony on a blade of giant kelp, as seen beneath a cover-slip. Note the many medusa buds.

Frond of female Plumularia colony with reproductive polyps and medusoids. From a blade of giant kelp.

The nematocysts of this hydroid have a very potent sting; the ensuing rash can last for several days. Approach these colonies with care.

Hydroid photographed at 17m depth.

This view shows the tiny, extended, feeding polyps that are surrounded by defensive tentacles especially rich in nematocysts. Reproductive structures are enclosed in the swollen orange corbula. From a floating dock, Monterey Harbor.