Arkys differ from Demadiana in the absence of deep setal pits on the carapace, sternum and paturon and the absence of elongated trumpet-shaped aggregate gland spigots on the posterior lateral spinnderets of both males and females.
Triangular Spiders
Arkyidae L. Koch, 1872
Type genus: Arkys Walckenaer, 1837
The Arkyidae were previously considered a subfamily of the Araneidae, but different considerably in somatic and genitalic characters, that places them closer to the Mimetidae. Arkyidiae have a prolateral field of short dense setae on tarsus I of males and enlarged aggregate gland spigots on the PLS of both sexes. Arkyidae can be further diagnosed by the following combination of characters: both sexes with a procurved posterior eye row and with posterior median eyes more widely spaced than the anterior median eyes; absence of radix and abdomen distinctively triangular in males; and a pattern of abdominal sigilla in two rows in females. Arkyids are distinguished from most araneids and tetragnathids by the absence of foraging webs.
Arkys
4 species
Differ from Arkys in the presence of deep setal pits with spherical sockets on the carapace, sternum and paturon and the presence of elongated trumpet-shaped aggregate gland spigots on the posterior lateral spinnerets of both males and females.
Demadiana
6 species
Differs distinctly from Demadiana by the much narrower distance of the posterior median eyes.
Genus 3645
1 species
Publications
V.W. Framenau, N. Scharff & M.S. Harvey (2010): Systematics of the Australian orb-weaving spider genus Demadiana with comments on the generic classification of the Arkyinae (Araneae : Araneidae). Invertebrate Systematics. 24: 139 - 171