Web Directory

» Brown Hydra: Hydra oligactis
   Photographs and information from ARKive including description, range, habitat, biology, threats and conservation.
   http://www.arkive.org/brown-hydra/hydra-oligactis/

» Fire Corals: Millepora spp.
   Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
   http://www.arkive.org/fire-corals/millepora-spp/

» Gonionemus: Hydromedusa
   Exercise from Invertebrate Anatomy OnLine covering the systematics and structure of this hydrozoan.
   http://webs.lander.edu/rsfox/invertebrates/gonionemus.html

» Green Hydra: Chlorohydra viridissima
   Photographs and information on this organism.
   http://fcps.edu/islandcreekes/ecology/green_hydra.htm

» Hydra
   Exercise from Invertebrate Anatomy OnLine covering the systematics and structure of this hydrozoan, including its microscopic anatomy.
   http://webs.lander.edu/rsfox/invertebrates/hydra.html

» Hydra Oligactis
   Rosemarie Arbur has made a series of drawings of a hydra devouring a water flea.
   http://www.microscopy-uk.org.uk/mag/artsep01/rahydra.html

» Hydras
   Photographic study by Jan Parmentier of these organisms, with images of various reproductive structures.
   http://www.microscopy-uk.org.uk/mag/artjun98/janhydra.html

» Image gallery: Hydra
   Includes downloadable video clips of the behavior of a typical hydra extending and contracting.
   http://www.microscopy-uk.org.uk/mag/artoct03/dfhydra.html

» Lace Coral: Stylaster californicus
   Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
   http://www.arkive.org/lace-coral/stylaster-californicus/

» Obelia
   Exercise from Invertebrate Anatomy OnLine covering the systematics and structure of this hydrozoan.
   http://webs.lander.edu/rsfox/invertebrates/obelia.html

» Obelia colony
   Photo.
   http://www.ou.edu/class/invert/colony.htm

» Portuguese Man of War
   Research project by Rissa Niemi on this jellyfish including its classification, habitat, reproduction, adaptations, nutrition and interactions with other species.
   http://bioweb.uwlax.edu/bio203/s2008/niemi_riss/

» The Hydrozoa Directory
   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.
   http://www.ville-ge.ch/musinfo/mhng/hydrozoa/hydrozoa-directory.htm

» Vallentinia gabriellae
   Taxonomy, description and photograph of the hitch-hiking jellyfish, its habitat and distribution, life history and community ecology.
   http://www.sms.si.edu/irlspec/Vallen_gabrie.htm

» Velella velella
   Exercise from Invertebrate Anatomy OnLine covering the systematics, natural history and anatomy of this hydrozoan.
   http://webs.lander.edu/rsfox/invertebrates/velella.html