Morphology of putative chemosensory setae in males of the spider genus Ariadna Audouin (Araneae, Synspermiata, Segestriidae)

Chemoreception in spiders plays an important role in prey detection, conspecific recognition and recognizing chemical cues in the environment. Sexually dimorphic structures often suggest a role in mating and there are not many papers describing sexual dimorphism in chemosensory setae in spiders. In this study, we present the first detailed morphological description of scopulate putative chemosensory setae in the palpal tarsi (cymbium) and in the distal segments of the legs of adult males of seven species of the spider genus Ariadna (Segestriidae) [A. araucana Grismado, A. boliviana Simon, A. corticola Lawrence, A. maxima (Nicolet), Ariadna sp. 1 (AUS), Ariadna sp. 2 (AFR-CONT), Ariadna sp. 3 (AFR-MAD)]. Our results show three different grouping configurations of five morphologically different types of scopulate setae (types a–e). This is the first detailed description of this type of setae on legs of a Synspermiata spider contributing to the knowledge of the morphology of different types of sensilla in this group of spiders. Our findings show that the scopulated setae of Ariadna do not seem to be homologous to the pseudoscopula of Mesothelae and Mygalomorphae. We also discuss how our findings relate to previous hypotheses of female sex pheromone detection and support during copulation.
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Setae morphology;  Sex pheromones;  Chemoreception;  Scanning electron microscopy;  Sensory structures

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Giroti AM, Brescovit AD. Morphology of putative chemosensory setae in males of the spider genus Ariadna Audouin (Araneae, Synspermiata, Segestriidae). Zoomorphology. 2019 June;138(2):249-263. doi:10.1007/s00435-019-00442-8.
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