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Sematuridae include about 40 species in about six genera (Minet and Scoble 1999). All but one of these are in the subfamily Sematurinae, which are nearly all Neotropical. The subfamily Apoprogoninae consists of only the African species Apoprogones hesperistis. The adult moths are medium-sized to large, often with tailed hindwings and sometimes brightly colored. Most are nocturnal, but some are diurnal. In the resting posture the wings are spread out against the substrate as in Geometridae. The Sematuridae are placed in the Geometroidea by Minet and Scoble (1999), but differ from the other two families therein included, Geometridae and Uraniidae, in lacking paired ultrasound-detecting tympanal organs at the base of the abdomen. Excellent images of adult and larval sematurids can be found at Caterpillars, pupae, butterflies & moths of the ACG and Caterpillars and Parasitoids of the Eastern Andes in Ecuador.