Cyriocosmus

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