1. Brachyurans (Linnaeus, 1758), the true crabs contain more than 6500 species and is the largest clade of the decapods crustacean

2. Branchiopoda - primitive aquatic mainly freshwater crustaceans: fairy shrimps; brine shrimps; tadpole shrimps; can shrimps; water fleas subclass Branchiopoda class Crustacea, Crustacea - class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas genus Daphnia - water fleas

3. The Biramous antennules of decapods, in particular, are considered the primary sensory organs for olfactory chemoreception and exclusively contain, on the outer flagellum, the aesthetasc sensilla, each innervated by hundreds of olfactory receptor neurons (Schmidt and Mellon, 2011 ).

4. Contents include: The typical course of early embryonic development in the Dibranchiates; The typical course of later embryonic development in the Dibranchiates; The typical course of embryonic development in the Decapods and its Modification; The embryonic development of the Loliginids; and The embryonic development of the Oegospids, Sepiids, Octopods, and Argonautids.