Science

Information about the classification, anatomy, and life cycle of this class, including photographs and diagrams. Also provides biographies and photos of hydrozoan systematists and marine naturalists of the past.

Includes downloadable video clips of the behavior of a typical hydra extending and contracting.

Rosemarie Arbur has made a series of drawings of a hydra devouring a water flea.

Photographic study by Jan Parmentier of these organisms, with images of various reproductive structures.

Overview of this freshwater polyp with photographs of a budding specimen and several closeup views.

Research project by Rissa Niemi on this jellyfish including its classification, habitat, reproduction, adaptations, nutrition and interactions with other species.

Taxonomy, description and photograph of the hitch-hiking jellyfish, its habitat and distribution, life history and community ecology.