n African Zoology - A morphological description of the sagittal otoliths of two mormyrids, and (Family: Mormyridae)

Volume 35, Issue 1
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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The morphology of the sagittal otoliths of two South African mormyrid fish, and , were studied to determine possible morphological significance. The sagittae of and are kidney-shaped and oblong, respectively. The ventral margin is slightly indented in the former and slightly flattened in the latter. The sulcus acusticus of both species is archaesulcoid but mesial in and ostio-caudal in . The crista inferior in is ridge-like and well defined posteriorly and anteriorly, whereas in it is clearly defined posteriorly and disappears anteriorly. The otoliths of both species do not have a rostrum, antirostrum or an excisura. The differences in sagittal morphology between the two mormyrid species are distinct.

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