Carapace laterally compressed forming a bivalve-like shell enclosing the bases of the legs; a hinged rostrum covering the eyes; abdomen tapering ending in a forked tail (caudal furca); with 7 abdominal segments. Colourless with bright red eyes. Males without swollen or heavily setose flagella on antenna 1. Up to 1 cm long
Flattened crustaceans with a hinged flap over the eyes and living in muddy environments are sea fleas, variously called phyllocarids, leptostracans or nebaliaceans, depending on what level in the crustacean hierarchy is being referred to. There are several types of crustaceans which jump like fleas but these are not what are referred to here. Leptostracans are never found out of sea water. Leptostracans in southern Australia are usually identified as Nebalia longicornis but there are at least 3 species recognised as new in Museum collections.
Intertidal to 18 m depth.
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed