Spinola originally thought that there were two species A. unicolor and A bicolor but we now know that these are the female and male respectively.

Aporus unicolor is a specialised hunter in that it has only one recorded prey, the purse-web spider Atypus affinis.

The female A. affinis can live for up to eight years in its subterranean silky tubular web, to which A. unicolor gains access by using its specialised enlarged fore-femur.

The species appears to be thermophilic and shows a strong preference for south-facing slopes and banks in sunny locations.

[4] In Great Britain A unicolor is confined to southern England from Cornwall in the west to Kent north to Cambridgeshire with recent records in South Wales[5] and the Channel Islands.