Diversity: 13 species described. According to Dippenaar-Schoeman (1991) the genus comprise three species groups:
I. S. fasciata group: S. barnardi, S. dorstlandica, S. fasciata, S. griffinae, S. neseri, S. perelegans, S. roshensis
II. S. schreineri group: S. annettae, S. longipedata, S. schreineri, S. semicoccinea
III. S. henscheli group: S. henscheli, S. louwi.
Distribution: Nearly endemic for Namibia, some parts of Botswana and South Africa.
Appearance: Smaller spiders with typical spinnerets (morphological adaptations for living in a sand). Coloration variable, adult males differ in colour from females.
Biology: Inhabits exclusively sandy biotopes, dunes, or planes with scare vegetation. Seothyra live in burrows, about 10 - 20cm deep. An entrance of a burrow is accompanied by the characteristic web covered by sand, which resemble "trap doors" of mygalomorphs. This web is composed of two (or more) lobes, thus reminding spoor of small antelope (they are sometimes called “spoor spiders” or “buck-spoor spiders”). A patchy distribution is characteristic for them, burrows are often very close each other, lobes can get even into a contact. It is great fun, to attract them out of their burrows by disturbing with straw of grass, which they attack. Some species prefers ants for a pray. Matriphagy presented (Dippenaar-Schoeman 1991). Seothyra is remarkable as the oldest known web of spider. The fossil from Miocene are nearly identical with recent spoors (Pickford 2000). Also it is a smart spider adjusting its foraging activity to temperature and wind (Lubin and Henschell 1990, Henschell 2000).