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Portunoidea is a Taxonomic rank of that includes the family Portunidae, the swimming crabs. Which other crab families are also placed here is a matter of some contention, and may be revised following molecular phylogenetic analyses.
In some, the first maxilliped's endopod is lobed, forming the characteristic portunid lobe. The are usually robust, and in some the last pereiopod pair has ovate Dactylus. The sutures of the sternum between segments 4 to 8 are usually incomplete, and in the Portunidae, the eighth sternite is usually visible if seen from below and has a penial groove.
In males, the abdominal somites are either all free or the third to fifth are fused, often retaining the sutures though. The first gonopod is strongly curved, with a swollen and strongly hooked base.
It also contains the genus Garthopilumnus.
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