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

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Systematic keys to genera and species

Carapace key

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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

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