Contributions to Zoology, 67 (4) 237-256 (1998)G. A. Bishop; R. M. Feldmann; F. Vega: The Dakoticancridae (Decapoda, Brachyura) from the Late Cretaceous of North America and Mexico
Systematic keys to genera and species

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Carapace key

1a 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