A incomum associação de peixes e caranguejos da Formação Romualdo, Aptiano-Albiano da Bacia sedimentar do Araripe, NE do Brasil

The unusual association of fish and crabs from Romualdo Formation, Aptian–Albian the Araripe sedimentary Basin, NE Brazil. In a study collection fossils Formation in “Araripe pernambucano”, an Vinctifer comptoni Rhacolepis buccalis with eubrachyurans orithopsids was observed four calcareous nodules. Associations were discussed based on ecological taphonomic hypotheses. It is noted degree articulation organisms, that either death or availability crab moults sediment possibly occurred before fish. addition, do not have teething consistent feeding crabs. Thus, this would occur due to fossilization processes interactions. also emphasized systematic paleogeographic aspects groups. Romualdocarcinus salesi probably related “higher” true (Eubrachyura), hypothesis already raised previous works, preservation its dorsal carapace next pleon subquadrangular shape similar those seen group. occurrence Exucarcinus gonzagai associated fish, concretions shales, can raise question E. Araripecarcinus ferreirai species as synonyms. data obtained survey distribution geological formations correlated age corroborates Tethyan marine influence Araripe. Keywords: ichthyolites, decapods, paleoecology, taphonomy, Santana Group, Cretaceous.