Calculus (spider)
| Calculus bicolor | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Euarthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Araneomorphae |
| Family: | Orsolobidae |
| Genus: |
Calculus Purcell, 1910 |
| Species: | C. bicolor |
| Binomial name | |
|
Calculus bicolor Purcell, 1910 |
|
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.Calculus bicolor was described by 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 those of oonopids.
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