Estudo morfológico de duas populações de Hoplias grupo malabaricus (Characiformes: Erytrinidae) procedentes da Bacia do Rio Grande, Estado de São Paulo.
Resumo
In the present research, 116 specimens of Hoplias sp. (Erythrinidae:
Characiformes) from Grande river basin, São Paulo state (Alto-Paraná basin) were
morphologically analyzed. They are all representants of malabaricus group , which
can be distinguished of lacerdae group mainly by the shape of dentary region, and the
number of pores in each dentary.
From each fish analyzed, it was obtained 24 meristic and 33 morphometric data.
The osteological analysis was realized in four exemplars of Pardo river basin.
In the studied sample, it was found two different species, and they are sympatric
in the majority of localities. These results corroborate with cytogenetic studies, which
demonstrated two different citotypes in Grande river basin.
This way, a description was realized for the species, that in this work are named
Hoplias sp. A and Hoplias sp. B. They can be distinguished one from another by a
combination of characteristics, mainly the shape and the number of teeth in the
accessory ectopterigoid and the proportions and distribution of infraorbitals.
Morphological differentiation among them was analyzed by the principal
component analysis, and the results indicate differences in body form.