Chilelopsis calderoni

Chilelopsis calderoni is a species of mygalomorph spiders of Chile, named after Dr Raúl Calderón. Males differ from C. puertoviejo in the more sinuous distal portion of the bulbal duct; females differ in the spermathecae with a distinct fundus and a narrowed duct. Males differ from C. serena by the presence of a dense patch of setae on the anterior tibiae, females in the undivided spermathecae.

Description

 * Female: total length 17.95 mm; cephalothorax length 6.4 mm, width 5.3 mm; cephalic region length 4 mm, width 3.55 mm; fovea width 0.67 mm; medial ocular quadrangle length 0.55 mm, width 1.01 mm; labium length 0.65 mm, width 1.12 mm; sternum length 3.32 mm, width 2.82 mm; clypeus width 0.35 mm. Its cephalic region is wide and convex, while its fovea is deep, and straight. Its labium possesses no cuspules, and a serrula is absent. Its sternal sigilla is small and oval. Its chelicerae are robust and short; rastellum formed by long and attenuate but stiff setae. The entire spider is a light yellow colour, while its abdomen has a series of mottles along its dorsum.
 * Male: total length 11.24 mm; cephalothorax length 5.56 mm, width 4.73 mm; labium length is 0.62 of its width; sternum width is 0.92 of its length. Its cephalic region is wide and short. Its clypeus is wide. Chelicerae has a weak rastellum, with a large intercheliceral tumescence. Its labium possesses 3 cusps. Its posterior sigilla is large and separated from margin. Its legs and cephalothorax are a yellowish colour, while its abdomen is yellowish with brown spots.

Distribution
Sand dunes in Regions III (Atacama Region) and IV (Coquimbo Region).