[1] Fossilized sheet webs which closely resemble the modern ones were found in Miocene eolianites of the southern Namib desert, and were dated to some 16 million years ago.

[2] When the burrow is dug, the sand particles are apparently bound in parcels of silk, to facilitate carrying, before these bundles are spun unto the surface webbing.

[3][10] Repeated opening of the silky flaps create an impression in the sand which can be likened to a cleft hoof imprint or, in some species, the shape of a four-leaf clover.

[6] In response to periods of extreme climate, such as high winds along with low precipitation, the distribution of the burrows may become clustered as a defense against population collapse.

[3] She takes an upside down position under the burrow cover,[2] and will first venture to the underside of the sheet web before she strikes and eventually disentangle her prey.

[1] As the female can endure a critical thermal maximum of 49 °C, she shuttles up and down the burrow to retrieve prey,[1] and spends limited time under the sheet web.

[2] Seothyra species are semelparous, meaning that they have a single reproductive episode before death, and they practice extended brood care.

[1] The young will eat their mother's corpse (a behaviour called matriphagy) and the sheet web before they vacate the parent nest,[2][9] but typically disperse less than a metre away.

Females are preyed on by araneophagous Palpimanus spiders, which likely lure them closer by producing surface Rayleigh waves with their specialized front legs.

Seothyra and its sister genera Dresserus and Gandanameno form a southern and eastern African clade of the velvet spiders.