Cladocyclus

Abstract: Thirteen fragments of a fossil parasitic copepod have been recovered from two specimens of the fossil teleost fish, Cladocyclus gardneri, from the Santana Formation in Brazil. The fossil fragments are preserved in the round and represent both sexes of a primitive species of the family Dichelesthiidae, related to the modem genera Anthosoma and Dichelesthium.

Abstract: Cladocyclus is a genus of ichthyodectiform fish that is best known from fossils found in shallow marine Cretaceous deposits in Brazil and Morocco Herein, a new species of Cladocyclus is described on the basis of a fossil that comprises an articulated skull and anterior part of the body, preserved as part and counter-part in what was originally a single eroded nodule of fluvially-deposited volcanolithic sandstone from the Lower Cretaceous (upper Albian) portion of the Winton Formation near Isisford, central-western Queensland, Australia This specimen represents the first record of Cladocyclus in eastern Gondwana, and indicates that species of this fish may also have inhabited freshwater environments The new species is assigned to the genus Cladocyclus based on the morphology of the cleithrum (the arms are oriented at approximately 90° to each other) and a mandibular articular facet that incorporates portions of the angular, the articular and the retroarticular Cladocyclus geddesi sp nov can be distin

Abstract: The genus Cladocyclus is known from the most important Brazilian North-Eastern basins, being more abundant and better preserved on the Lower Cretaceous Araripe Basin, where it occurs in both the Crato and Santana Formations. Comparing the different species found in this Basin (cf., Cladocyclus sp. from the Crato Formation and Cladocyclus ferus from the Santana Formation) with the type species, Cladocyclus gardneri , we can conclude that the Crato Formation taxon represents a juvenile of C. gardneri and that C. ferus is a junior synonymous of C. gardneri . Considering the palaeoenvironmental conditions of the Araripe Basin we can suggest that the lacustrine Crato Formation was used as a nursery for marine taxa such as C. gardneri .