Cyriocosmus is a genus of tarantulas that was first described by Eugène Louis Simon in 1903. They are small to medium spiders, with a bicolored or one same color carapace. Diagnosis It differs from all other tarantulas by the paraembolic apophysis in the palpal bulbs of males, and a spermatheca with two spiral receptacles, which usually end in a caliciform or globular extension. Except for C. nogueiranetoi, which owns a S shape extension. All the species also own type 3 urticating hairs. Species it contains twenty-three species, found in South America, on Tobago, and Trinidad: Cyriocosmus aueri Kaderka, 2016 – Peru Cyriocosmus bertae Pérez-Miles, 1998 – Brazil Cyriocosmus bicolor (Schiapelli & Gerschman, 1945) – Brazil Cyriocosmus blenginii Pérez-Miles, 1998 – Bolivia Cyriocosmus elegans (Simon, 1889) – Venezuela, Trinidad and Tobago Cyriocosmus fasciatus (Mello-Leitão, 1930) – Brazil Cyriocosmus fernandoi Fukushima, Bertani & da Silva, 2005 – Brazil Cyriocosmus foliatus Kaderka, 2019 – Peru Cyriocosmus giganteus Kaderka, 2016 – Peru Cyriocosmus hoeferi Kaderka, 2016 – Brazil Cyriocosmus itayensis Kaderka, 2016 – Peru Cyriocosmus leetzi Vol, 1999 – Colombia, Venezuela Cyriocosmus nicholausgordoni Kaderka, 2016 – Venezuela Cyriocosmus nogueiranetoi Fukushima, Bertani & da Silva, 2005 – Brazil Cyriocosmus paredesi Kaderka, 2019 – Peru Cyriocosmus perezmilesi Kaderka, 2007 – Bolivia Cyriocosmus peruvianus Kaderka, 2016 – Peru Cyriocosmus pribiki Pérez-Miles & Weinmann, 2009 – Peru Cyriocosmus ritae Pérez-Miles, 1998 – Peru, Brazil Cyriocosmus sellatus (Simon, 1889) (type) – Peru, Brazil Cyriocosmus venezuelensis Kaderka, 2010 – Venezuela Cyriocosmus versicolor (Simon, 1897) – Paraguay, Argentina Cyriocosmus williamlamari Kaderka, 2016 – Venezuela In synonymy C. chicoi Pérez-Miles, 1998 = Cyriocosmus bicolor C. planus (Fischel, 1927) = Cyriocosmus elegans C. rogerioi Pérez-Miles & Weinmann, 2009 = Cyriocosmus pribiki C. semifasciatus Mello-Leitão, 1939 = Cyriocosmus elegans Transferred to other genera Cyriocosmus butantan Pérez-Miles, 1998 → Hapalopus butantan Cyriocosmus nigriventris Mello-Leitão, 1939 → Hapalopus nigriventris See also List of Theraphosidae species References External links Theraphosidae Theraphosidae genera Spiders of South America