''Acanthogonatus peniasco'' is a mygalomorph spider of

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

, its name arising from its type locality: El Peñasco, Linares, VII Region (del Maule), Chile.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). Females differ from those of '' A. franki'' and '' A. recinto'' in the shorter, wider, and more sclerotized spermathecal ducts, and from those of other species in the genus by having 1-1-1 P spines in the

patella The patella, also known as the kneecap, is a flat, rounded triangular bone which articulates with the femur (thigh bone) and covers and protects the anterior articular surface of the knee joint. The patella is found in many tetrapods, such as m ...

IV.

Description

*Female: total length ;

cephalothorax The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. (The terms ''prosoma'' and ''opisthosoma'' are equivalent to ''cepha ...

length ; cephalic region length , width ;

fovea Fovea () (Latin for "pit"; plural foveae ) is a term in anatomy. It refers to a pit or depression in a structure. Human anatomy *Fovea centralis of the retina * Fovea buccalis or Dimple * Fovea of the femoral head * Trochlear fovea of the fr ...

width ; medial ocular quadrangle , width ; labium length , width ; sternum length , width . Its cephalic region is moderately convex, with a deep fovea with a posterior notch. Its labium possesses 2 cuspules. A serrula is present. Its posterior sternal sigilla is oval and submarginal, with its sternum being rebordered. Chelicerae: rastellum is formed by long, thin

setae In biology, setae (singular seta ; from the Latin word for "bristle") are any of a number of different bristle- or hair-like structures on living organisms. Animal setae Protostomes Annelid setae are stiff bristles present on the body. Th ...

. Its cephalothorax, legs and

palpi Pedipalps (commonly shortened to palps or palpi) are the second pair of appendages of Chelicerata, chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ...

are a reddish-brown colour, while its abdomen is a light yellowish brown, with dorsal

mottles Mottle is a pattern of irregular marks, spots, streaks, blotches or patches of different shades or colours. It is commonly used to describe the surface of plants or the skin of animals. In plants, mottling usually consists of yellowish spots o ...

present.

Distribution

It is known to habitate in borrows only from the type locality. These have an open entrance, lined with little

silk Silk is a natural protein fiber, some forms of which can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the coc ...

, in banks and hill slopes in an open forest. It sometimes co-habitates the same area as

Calathotarsus ''Calathotarsus'' is a genus of spiders in the family Migidae Migidae, also known as tree trapdoor spiders, is a family of spiders with about 100 species in eleven genera. They are small to large spiders with little to no hair and build burr ...

and

Scotinoecus ''Scotinoecus'' is a genus of South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the ...

species.

References

External links

*
ADW entry
* {{Taxonbar, from=Q2677879 Pycnothelidae Spiders of South America Spiders described in 1995 Endemic fauna of Chile