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The crustacean order Tanaidacea make up a minor group within the class Malacostraca. There are about 940 species in this order.

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Apseudopsis is a genus of crustaceans belonging to the family Apseudidae.

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Apseudopsis latreillii is a species of tanaidacean widely-distributed in the north-east Atlantic and Mediterranean coastal waters. It inhabits sandy and muddy bottoms from the intertidal to 138 m (453 ft) in depth and is often found in large numbers. It grows up to 7 mm (0.28 in) in length.

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Leptocheliidae is a family of malacostracans in the order Tanaidacea. There are more than 30 genera and 140 described species in Leptocheliidae.

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Longiflagrum is an estuarine genus of crustacean in the order Tanaidacea.

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Longiflagrum amphibium is an estuarine species of crustacean in the order Tanaidacea. It is known only from the type locality, which is the intertidal zone at Port Hedland, Northwestern Australia.

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Metapseudidae is a family of crustaceans belonging to the order Tanaidacea.

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Parapseudinae is an estuarine subfamily of crustacean in the order Tanaidacea.