Acanthogonatus alegre

Acanthogonatus alegre is a mygalomorph spider of Chile, its name using the Spanish word for “happy”, referring to the aspect of a happy face that the female epigastrium has in posterior view. Females are recognized by the epigastrium produced in a membranous extension and the long, slender and bifurcated spermathecae.

Description

 * Female: total length 23.3 mm; cephalothorax length 8.4 mm, width 6.2 mm; cephalic region length 5.35 mm, width 4.2 mm; fovea width 0.75 mm; medial ocular quadrangle length 0.67 mm, width 1.25 mm; labium length 0.67 mm, width 1.37 mm; sternum length 4.12 mm, width 3.1 mm. Its cephalic region is flat, low and narrow, with its fovea slightly procurved and with a small posterior notch. Its labium possesses 1 cuspule. A well-developed serrula is present. Its sternal sigilla is oval, elongated, small and shallow; its sternum is rebordered. Chelicerae: rastellum is absent. Its spermathecae has a conspicuous epigastric projection. Its cephalothorax, legs and chelicerae are an olive brown colour with golden hairs, while its abdomen is lighter, with a darker chevron similar to the one in A. campanae.

Distribution
Known only from its type locality: Antofagasta, (Region II) Chile.