''Acanthogonatus alegre'' 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 using the
Spanish word for “happy”, referring to the aspect of a ''happy'' face that the female epigastrium has in posterior view.
[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 are recognized by the
epigastrium
In anatomy, the epigastrium (or epigastric region) is the upper central region of the abdomen. It is located between the costal margins and the subcostal plane. Pain may be referred to the epigastrium from damage to structures derived from the fo ...
produced in a membranous extension and the long, slender and bifurcated
spermathecae.
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 , width ; 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 length , width ; labium length , width ;
sternum length , width . Its cephalic region is flat, low and narrow, with its fovea slightly procurved and with a small posterior notch. Its labium possesses 1 cuspule. A well-developed serrula is present. Its sternal sigilla is oval, elongated, small and shallow; its sternum is rebordered.
Chelicerae: rastellum is absent. Its spermathecae has a conspicuous epigastric projection. Its cephalothorax, legs and chelicerae are an olive brown colour with golden hairs, while its abdomen is lighter, with a darker
chevron
Chevron (often relating to V-shaped patterns) may refer to:
Science and technology
* Chevron (aerospace), sawtooth patterns on some jet engines
* Chevron (anatomy), a bone
* ''Eulithis testata'', a moth
* Chevron (geology), a fold in rock lay ...
similar to the one in ''
A. campanae''.
Distribution
Known only from its type locality:
Antofagasta, (Region II) Chile.
See also
*
Spider anatomy
*
Regions of Chile
Chile is divided into 16 regions (in Spanish, ''regiones''; singular ''región''), which are the country's first-level administrative division. Each region is headed by an intendant (''intendente)'', appointed by the President of Chile, and a di ...
References
External links
*
ADW entry*
ZipcodeZoo entry
{{DEFAULTSORT:Acanthogonatus alegre
Pycnothelidae
Spiders of South America
Spiders described in 1995
Endemic fauna of Chile