The copulatory organs of the cryptic species Lycosa thorelli and Lycosa carbonelli are studied and are shown to exhibit some differences. The morphology of the epigynum, vulva and palpal organs of L. carbonelli are here described for the first time. Additional morphological data of these species are provided and the specific diagnosis reformulated. Measurements indicated that the copulatory organs of L. carbonelli are larger than L. thorelli. Morphological comparison between the parental species and the hybrid progeny show that hybrids are intermediate in morphology and size. The reproductive isolation in these cryptic species and the inheritance of the sexual characters in the hybrid progeny are discussed.
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