''Chaco sanjuanina'' is a species of
mygalomorph spiders of Argentina, named after its type locality: San Agustin, Valle Fertil,
San Juan, Argentina
San Juan () is the capital and largest city of the Argentine province of San Juan in the Cuyo region, located in the Tulúm Valley, west of the San Juan River, at above mean sea level, with a population of around 112,000 as per the (over ...
.
[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).] Males can be distinguished from those of its cogenerates by the more conical bulb; females differ from ''
C. tecka'' in having fewer spines on the metatarsus IV, and from ''
C. patagonica'' in having labial cuspules arranged in a transverse row and the more numerous maxillary ones.
Description
The male has a total length of , a
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 of and width of , a cephalic region length of and width of ; an ocular quadrangle (OQ) length of and width of ; a labium length of and width of ; and a
sternum length of and width of . The labium possesses seven cuspules. The serrula is non-visible. The sternal sigilla is small, oval, and shallow, while its sternum is not rebordered. Its colour is faded, a uniform yellow, its
caput being darker; the abdomen has a light
chevron.
The female has a total length of ; a cephalothorax length of and width of ; a cephalic region length of and width of ; a
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 of ; an OQ length of and width of ; a labium length of and width of ; and a sternum length of and width of . Its cephalic region is strongly convex, the fovea is sinuous and straight. Its labium has eight cuspules. The sternal sigilla is small and oval; the sternum is quite convex, not rebordered. The colour is the same as in the male.
See also
*
Spider anatomy
*
List of Nemesiidae species
References
External links
ADW entry
Nemesiidae
Spiders of Argentina
Spiders described in 1995
{{Nemesiidae-stub