Biantidae

Biantes, photographed by Ron Yeo.


Belongs within: Laniatores.
Contains: Hinzuanius, Metabiantes.

The Biantidae are a family of laniatorean harvestmen in which the eyes are not borne on a central eyemound but widely separated on the carapace.

See also: Biantidae: the importance of titillators.

Characters (from Kury & Pérez González 2007): Body 1.5–55 mm long. Frontal border of carapace straight with small cheliceral sockets. Common ocularium absent. Typically with small frontal hump. Sulcus I marked. Venter without remarkable features; tracheal spiracles not concealed by bridges, but may be hidden under the fold separating coxa IV from the spiracular area. Chelicera with well-marked bulla. Pedipalps enlarged, subchelate tibia-tarsus armed with large setiferous tubercles, patella ventrally with or without a mesoventral setiferous tubercle, thin and almost unarmed femur, commonly with only one ventrobasal small setiferous tubercle. Penis typically with fully retractable capsula interna; follis reduced, modified in a pair of soft titillators that almost invert its position with capsula interna is everted (except in Stenostygnidae with non-inverting rigid titillators); capsula interna formed by pair of rigid and tubular conductors, stylus simple (without parastylar collar). Truncus without well-defined ventral plate, cylindrical, blunt apically; pars distalis ventrally with small acute setae and subapical Schwellkörper, devision between pars distalis and pars basalis not evident.

REFERENCES

Kury, A. B., & Pérez González, A. 2007. Biantidae Thorell, 1889. In Harvestmen: The Biology of Opiliones (R. Pinto-da-Rocha, G. Machado & G. Giribet, eds) pp. 176-179. Harvard University Press: Cambridge (Massachusetts).

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