''Chaco socos'' is a species of
mygalomorph
The Mygalomorphae, or mygalomorphs, are an infraorder of spiders, and comprise one of three major groups of living spiders with over 3000 species, found on all continents except Antarctica. Many members are known as trapdoor spiders due to t ...
spiders 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 ...
, named after its type locality: Socos, Limarí, Region IV (
Coquimbo region
The Coquimbo Region ( es, Región de Coquimbo, ) is one of Chile's 16 regions (first order administrative divisions). It is bordered by Atacama to the north, Valparaíso to the south, Argentina to the east, and the Pacific Ocean to the west. ...
).
[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).] This species differs from ''
C. tigre'' by its
spermathecae
The spermatheca (pronounced plural: spermathecae ), also called receptaculum seminis (plural: receptacula seminis), is an organ of the female reproductive tract in insects, e.g. ants, bees, some molluscs, oligochaeta worms and certain other in ...
having a longer duct and a less globose fundus, and by constructing a beveled door for its burrow; the general colouration is grayish, while ''C. tigre'' is more brownish coloured.
Description
The male has a total length of ; a
cephalothorax 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
The sternum or breastbone is a long flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, thus helping to protect the heart, lungs, and major blood vessels from injury. Sha ...
length of and width of . The labium possesses five cuspules. Its posterior sternal sigilla is small and shallow. Its cephalothorax is ashgray, with a
lycosid-like pattern, while the legs and palpi are gray with darker spots; its abdomen yellowish with darker dorsal spots.
The female has a total length of ; a cephalothorax length of and width of ; its labium length is 48% of the width; the sternum width is 72% of the length. The labium possesses three cuspules. The colour is the same as in the male.
Distribution and behaviour
This species has been collected in two localities, in high mountains near the sea, with moist soil. The animals construct a thick door for their burrow, which fits into the burrow opening. The outer face of the door is slightly concave, while the burrow walls are well-compacted and lined with silk.
See also
*
Spider anatomy
The anatomy of spiders includes many characteristics shared with other arachnids. These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pe ...
*
List of Nemesiidae species
References
External links
ADW entry
Nemesiidae
Spiders of South America
Spiders described in 1995
Endemic fauna of Chile
{{Nemesiidae-stub