Harpactira sp. 'Silaka' → Spermathecae Gallery

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Harpactira sp. 'Silaka' spermathecae documented/photographed by DevinsCreatures.

Photographs available as reference for hobbyists and those who have interest in the development of these receptacles. Please credit if used.

4/12/2026


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Determining Sex of Theraphosidae with Exuviae

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This is a guide for those who would like to learn the basics of determining the sex of Theraphosidae (tarantulas) via exuviae and how to properly process an exuvium for the best results. This guide will also go over the importance of knowing the structure of spermatheca as well as determining the presence of male accessory organs that may be confused as spermathecae. Spermathecae Structure versus Accessory Organs Before attempting to determine the sex of a tarantula via the exuviae, it is very important to know the species of the specimen and the unique structure of spermathecae that belongs to that species. This will prevent confusion or the possibility of mistaking male accessory organs as spermathecae. While not the case for all species, there are species that possess larger or more prominent accessory organs, which can make determining the sex difficult if one does not know which structure to look for.  It is also important to know the structure of the spermathecae to confirm w...
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