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Systematic keys to genera and species
Carapace key
next section1a Carapace circular, transversely flat, carapace regions poorly differentiated, thin, spiny, large ........................................................................................ Avitelmessus grapsoideus
1b Carapace quadrate or trapezohedral, arched, high, carapace regions well differentiated, granulate, small to medium-sized .................................................................................. 2
2a Carapace trapezohedral, longer than wide ...................................................... Seorsus wadei
2b Carapace quadrate; sides sub-parallel, sinuous, strongly arched ..........................................3
3a Carapace wider than long, sides converge posteriorly ...................... Dakoticancer overanus
3b Carapace square or longer than wide ................................................................................... 4
4a Carapace large, with inflated brachial chambers, prominent posterior shelf .... Dakoticancer australis
4b Carapace small with granulate, metabranchial ridges ................. Tetracarcinus subquadratus
Chelipede key
1a Propodus twice as long as high, granulate .......................................... Dakoticancer overanus
1b Propodus as long as high ...................................................................................................... 2
2a Propodus smooth, bulbous, and small ........................................ Tetracarcinus subquadratus
2b Propodus not smooth ........................................................................................................... 3
3a Propodus granulate .............................................................................. Dakoticancer australis
2c Propodus spiny ............................................................................ Avitelmessus grapsoideus