Anomopoda Water fleas Ceriodaphnia Daphnia Moina Scapholeberis Simocephalus argulus Fish Lice foliaceus Not an uncommon parasite of fish this family are thought to be primitive yet there is no evidence of this in the fossil record. crabs Geosesarma Vampire Crabs Potamon crayfish Barbicambarus Cambarellus Cambarus Cherax Euastacus Hobbseus Lacunicambarus Pacifastacus Procambarus cyclops fairy shrimp dendrocephalus redtail

gammarus mutations Naturally occuring, but bizarre, mutations. ostracod Clam Shrimp Ostracods are "by far the most common arthropods in the fossil record". Found the world over, they look like a tiny clam with a shrimp inside, are free swimming and show up nearly spontaneously in aquaria. Because of their tough shell most fish won't eat them, but fish with poweful jaws (Ie. Bettas, Cichlids) sometimes will. shrimp About Macrobrachium Atya Arachnochium Atyaephyra Atyoida Atyopsis Australatya Caridina Halocaridina Leptopalaemon Micratya Neocaridina Paracaridina Troglocaris triops