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Title

Cephalic osteology of Safidrud stone loach Oxynoemacheilus bergianus

Writers

JALILI P. | EAGDERI S.

Pages

 Start Page 21 | End Page 34

Abstract

 The hillstream loaches, family Nemacheilidae, are considered to be a complex group in terms of taxonomy because of difficulties to extract their morphological traits. Therefore, their classification has been established based on osteological and molecular grounds. In addition, study of the osteological features of fish’ s Head can help to better understanding of their biological characteristics such as feeding and respiration. Hence, this study was aimed to provide the characterization of the cephalic Osteology of Safidrud stone loach Oxynoemacheilus bergianus from Sefid River and comparing the results with those of O. angorae. For this study, sixteen specimens of Safidrud stone loach were collected using electrofishing. Specimens were fixed into 4% buffered formalin after anaesthetizing and then cleared and stained with alizarin red S and alcian blue for osteological examinations. The Safidrud stone loach shows differences in the shape of the neurocranium, bony elements forming suspensorial facets, connection position of the lateral ethmoid, possessing urohyal extra and shape of the pectoral fin radial in compare to O. angorae and other genus of nemacheilids that can be considered as distinctive characteristics of these two taxa. Regarding the weakness of the morphometric, meristic and color pattern traits for taxonomic study, the finding of this research can be used for future taxonomic studies of this taxa.

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