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ABSTRACT. We present a description of osteological alterations observed in the tucuxi, Sotalia fluviatilis (Gervais, 1853) from a sample of 43 specimens. Fractures were the most frequent alterations in the sample (16%), occurring in various regions of the skeleton such as the ribs, hyoid apparatus, transverse and neural processes of vertebrae and scapula. We observed three individuals with ankylosis between the cervical vertebrae and two individuals with morphological changes (cranio-caudally elongated hemal arch and flattened cranial margin of the scapula). The only observed pathology was a case of osteomyelitis in the left dentary, which caused the loss of teeth, deformation of the associated alveoli and the formation of a medial fistula (lingual) for drainage of purulent material. This represents the first record of osteomyelitis in S. fluviatilis.

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Abstract:The present study provides a species list of freshwater mussels from Catalão, the meeting of the Solimões and Negro rivers, in state of Amazonas, northern Brazil. Expeditions to collect molluscs were carried out between 2004 and 2006, during high and low water seasons. Three hundred and thirty-one bivalve shells, 25 valves, and 57 live specimens of four families and 10 species were identified. A single exotic species, Corbicula fluminea, represented over half the collected shells. All bivalve shells were photographed and registered at the mollusc collection of the Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus.

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