Description of a common stauromedusa on the Pacific Coast of the United States and Canada, new species (Cnidaria: Staurozoa).

"" is the most common staurozoan on the west coast of the United States and Canada. This species was described in the M.S.

Muscle and nerve net organization in stalked jellyfish (Medusozoa: Staurozoa).

Staurozoan cnidarians display an unusual combination of polyp and medusa characteristics and their morphology may be informative about the evolutionary origin of medusae. We studied neuromuscular morphology of two staurozoans, Haliclystus 'sanjuanensis' and Manania handi, using whole mount immunohistochemistry with antibodies against FMRFamide and α-tubulin to label neurons and phalloidin to label muscles. All muscles appeared to lack striations.