Theraphosid spiders are repleted with cuticular structures that evolved into distinct
morphologies and developed different functions. The stridulatory apparatus present in the
subfamily Theraphosinae is composed by a group of setae and opposed organs (ridged
surface) that emit sound through friction. Only sixteen genera of Theraphosinae spiders
were reported with stridulatory setae: Acanthoscurria, Aguapanela, Brachypelma,
Citharacanthus, Cyrtopholis, Grammostola, Hemirrhagus, Lasiodora, Longilyra, Nhandu …