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Top: Science: Biology: Flora_and_Fauna: Animalia: Arthropoda: Crustacea: Branchiopoda
Group including the Anostraca (brine shrimps, fairy shrimps), Notostraca (shield shrimps), and Diplostraca (water fleas).
The anostracans are primitive crustaceans found in inland, relictual, waters such as snow-melt pools, wet weather ponds, saline or alkaline lakes. They have no carapace and are thought to be similar in many features to the ancestral crustaceans. The body is elongate and shrimp-like and with little regional specialization of segments or appendages.
Notostracans are tadpole shrimps, of which only 10 species are known worldwide. They inhabit quiet, fishless, usually temporary, freshwaters where they crawl over the bottom or swim in the water. They have a carapace and the trunk is composed of about 40 segments and is divided into a large thorax and a small abdomen.
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