Genus: Xestoleberis Sars, 1866

Species of the genus Xestoleberis are characterized by the following features. Each valve has a crescent shaped scar known as the Xestoleberis -spot behind the eye (Athersuch et al. 1989). The valves are smooth, strongly inflated and with a range of shapes; from reniform, trigonal to ovate. The females are usually bigger than males; females have wide brood spaces in the posterior region of the valve. An1 has six podomeres, An2 has a well developed twojointed exopodite spinneret seta and three endopodite podomeres terminating into two stout chelate claws. Males have a pair of brush-shaped organs situated between the first and second pair of thoracic legs. The thoracic appendages are walking legs and the distal processes of the hemipenes are asymmetrical.