Acanthogonatus mulchen explained
Acanthogonatus mulchen is a mygalomorph spider of Chile, named after its type locality: Alto Caledonia, east of Mulchén, Region VIII (Bío Bío Region).[1] It is recognised by the long, narrow sternum. It differs from A. tolhuaca in the spermathecae having a less pronounced notch and the glandular areas on each side joining in the middle. It is larger (A. mulchen has a cephalothorax length of up to 13.2mm, and a total length of 35.05mm) and differs from A. brunneus by its uniformly colored abdomen.
Description
- Female: total length 29.5mm; cephalothorax length 11.8mm, width 9.5mm; cephalic region length 7.7mm, width 7.5mm; fovea width 1.5mm; medial ocular quadrangle length 1mm, width 1.9mm; labium length 0.95mm, width 2mm; sternum length 6.5mm, width 4.8mm. Its cephalic region is wide but low, while its fovea s straight to procurved with recurved ends, containing no posterior notch. Its labium possesses 2 cuspules. A serrula is present as a small patch of teeth only on the anterior face of the lobe. Its sternal sigilla is deep and long. Chelicerae: rastellum is absent. The entire spider is a uniform blackish-reddish-brown colour, except for one lighter spot in front of the abdomen. Juveniles have a similar color, but lighter, with diagonal lines of pale dots on the dorsum of their abdomen.
Distribution
Only in its type locality. It is found in densely silk-lined burrows, between 15mm20mm wide, which originate from under stones or at the base of trees. The burrow's mouth is funnel-like, with white silk extending so as to form a sort of collar.
External links
Notes and References
- Goloboff, Pablo A. "A revision of the South American spiders of the family Nemesiidae (Araneae, Mygalomorphae). Part 1, Species from Peru, Chile, Argentina, and Uruguay. Bulletin of the AMNH; no. 224." (1995).
