Calculus bicolor, the sole species of the genus Calculus, is a South African spider in the family Orsolobidae. Individuals are 4 mm in length, although only juveniles have been described. The abdomen is pale yellow with a broad brown patch and black markings on the sides of the spinnerets.[2] Calculus bicolor was described in 1910 by William F. Purcell, and long assigned to the Oonopidae (goblin spiders), until a 2012 study assigned Calculus to the family Orsolobidae on the basis of sensory organs that differed from those of oonopids.[3]

Calculus bicolor
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Orsolobidae
Genus: Calculus
Purcell, 1910[1]
Species:
C. bicolor
Binomial name
Calculus bicolor
Purcell, 1910[1]

References

edit
  1. ^ a b "Gen. Calculus Purcell, 1910". World Spider Catalog. Natural History Museum Bern. Retrieved 2016-02-25.
  2. ^ Purcell, W. F. (1910). "The phylogeny of the tracheae in Araneae". Quarterly Journal of Microscopical Science. 54: 519–564.
  3. ^ Platnick, Norman I.; et al. (2012). "Tarsal organ morphology and the phylogeny of goblin spiders (Araneae, Oonopidae), with notes on basal genera" (PDF). American Museum Novitates (3736): 1–52.