This is just my rough estimate (no formal Biological Science training) of the taxonomy of Crustacea.
Hopefully, this will help the average aquarist determine the origin of the freshwater shrimp in his/her tank.

TAXONOMY
Crustacea
Phyllopoda
(daphnia)
Copepoda
(cyclops)
Malacostraca
(Higer Crustaceans)
Brachiura Ostracoda
(seed shrimp)
Amphipoda
Decapoda
(10 feet)
Conchostraca
(clam shrimp)
Anostraca
(fairy shrimp)
(brine shrimp)
Brachyura
(true crabs)
Anomura
(hermit crabs)
Natantia
(shrimps)
Reptania
(spiny lobsters)
Astacura
Potamonidae
(freshwater crabs)
Atyidae
(Freshwater Only)
15 Genera
160 Species
Palaemonidae
Macrobrachium
Baltic Sea Shrimp
Homaridae
(lobsters)
Grapsidae
(mangrove dwellers)
Astacidae
(Old World River crayfish)
Ocypodidae
(fiddler crabs)
Caridina Neocaridina Palaeomonetes Macrobrachium Cambaridae
(New World River Crayfish)
Gecarcinidae
(true land crabs)
Atyopsis Atyidae Parastacidae
(S. Hemisphere Crayfish)
Atya Austroastacidae
(Australian Crayfish)

Last Updated on 1/12/00
By Joe Anderson
Email: submariner@lycosmail.com