''Acanthogonatus recinto'' 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: Recinto, Nuble, Region VIII, 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 are distinguished from those of ''
A. franki'' by the
spermathecae, having a more rounded and differentiated fundus and its basal portion extended internally, compared to those of ''
A. peniasco'' with a narrower, longer and less
sclerotized ducts; and from other species in the genus by having 1-1-1 P spines on its
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. Males differ from those of ''A.franki'' in the unique winglike projection at the base of the embolus.
Description
*Male: 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 ; medial ocular quadrangle length (OQ) , width ; labium length , width ;
sternum length , width . Its labium possesses 3 cuspules. A well-developed serrula is present; its teeth are widely spaced. Its sternal sigilla is small, oval and shallow; its sternum is rebordered.
Chelicerae: rastellum is weak. A small, ventrally protruding cheliceral
tumescence is present. Its leg I and
tibia
The tibia (; ), also known as the shinbone or shankbone, is the larger, stronger, and anterior (frontal) of the two bones in the leg below the knee in vertebrates (the other being the fibula, behind and to the outside of the tibia); it connects ...
are cylindrical and straight, with no
apophysis; its
metatarsus is also straight. 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 numerous 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 ...
and 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 ...
.
*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 ; (OQ) , width ; labium length , width ;
sternum length , width . Its cephalic region is of medium convexity; its fovea shaped straight to procurved, with a small posterior notch. Its labium possesses 4 cuspules. A well-developed serrula is present. Its sternal sigilla is small, oval and shallow; its sternum is rebordered.
Chelicerae: rastellum is weak. Color similar to male.
Distribution
It is found in only a few localities in Regions
VIII
8 (eight) is the natural number following 7 and preceding 9.
In mathematics
8 is:
* a composite number, its proper divisors being , , and . It is twice 4 or four times 2.
* a power of two, being 2 (two cubed), and is the first number of t ...
and
IX in Chile.
References
External links
*
ADW entry*
ZipcodeZoo entry
{{Taxonbar, from=Q2396447
Pycnothelidae
Spiders of South America
Spiders described in 1995
Endemic fauna of Chile