Acanthogonatus mulchen

Acanthogonatus mulchen
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Arachnida
Order:	Araneae
Suborder:	Mygalomorphae
Family:	Nemesiidae
Genus:	Acanthogonatus
Species:	A. mulchen
Binomial name
Acanthogonatus mulchen Goloboff, 1995

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 13.2 millimetres (0.52 in), and a total length of 35.05 millimetres (1.380 in)), and differs from A. brunneus by its uniformly colored abdomen.

Description

• Female: total length 29.5 millimetres (1.16 in); cephalothorax length 11.8 millimetres (0.46 in), width 9.5 millimetres (0.37 in); cephalic region length 7.7 millimetres (0.30 in), width 7.5 millimetres (0.30 in); fovea width 1.5 millimetres (0.059 in); medial ocular quadrangle length 1 millimetre (0.039 in), width 1.9 millimetres (0.075 in); labium length 0.95 millimetres (0.037 in), width 2 millimetres (0.079 in); sternum length 6.5 millimetres (0.26 in), width 4.8 millimetres (0.19 in). 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.^[1]

Distribution

Only in its type locality. It is found in densely silk-lined burrows, between 15 and 20 millimetres (0.59 and 0.79 in) 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.

See also

• Spider anatomy
• List of Nemesiidae species
• Regions of Chile

References

1. 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).

External links

• "Acanthogonatus mulchen". Integrated Taxonomic Information System.
• ADW entry
• Acanthogonatus mulchen at the Encyclopedia of Life