Dana, 1852
Fourth pereiopod, and usually also fifth, without true chelae. Carapace cylindrical, not flattened. Posterior thoracic sternites fused. Tail-fan entirely calcified and telson without suture.
The Nephropoidea or true lobsters include two families, Thaumastochelidae and Nephropidae. The Nephropidae are commercially very important, while the Thaumastochelidae include only three species, none of which is of economic interest; they are only listed here for completeness' sake.