Background: With respect to the importance of morphological parameters in zoology and their application to differentiate male from female specimens, the present study was conducted to identify the differential parameters of male and female Odontobuthus doriae.

Materials and methods : It was a descriptive study. 91 Odontobuthus doriae that their sex was previously determined according to their fertilization parameters were selected. Having put them in alcohol, the number of ventral serration, length of shoulder, and length of scorpion were determined using a ruler and t-test was used for data analysis.

Results : The study population included 39 male and 51 female Odontobuthus doriae. One male Odontobuthus doriae was omitted due to abnormality in its shoulder. The mean number of ventral serratio in each side was 31±3 in male and 22±2 in female Odontobuthus doriae, respectively (p<0.001). The mean length of shoulder was 6.5±1.65 in female and 8±2mm in male Odontobuthus doriae, respectively (p<0.001) and the mean length of male and female Odontobuthus doriae was 5.35±1.65 and 5.35±2.15, respectively (NS).

Conclusion : The number of ventral serratio, and length of the shoulder can be used to differentiate male and female Odontobuthus doriae.