Penta means five and was meant to refer to the five genera of the Asteron complex, revised by Barbara Baehr and Rudy Jocqué 1996-2001, however this was not possible and instead only four new genera were created, Subasteron, Phenasteron and Leptasteron as well as Pentasteron. Pentasteron is characterised by a concave section of the male palp. This species named because of its similarity to Storosa, another Zodariid. The colour of the carapace is chestnut brown. The chelicerae, or jaws, medium brown. The sternum, or front of the chest, medium brown. The coxae, or first leg segmnents, are white with dark brown rims. The trochanters, or second leg segment, are dark with yellow patch underneath. The thighs are white with dark patches at base in near half, dark brown in outer half. The other parts of the legs are yellowish brown, the rear tibiae, or shins, with blackish lateral streaks. The abdomen is shiny black, the upper surface with two pairs of small white spots and 3 crescent-shaped spots in front of spinnerets. Each flank has one oblique white spot and pale mottling. Underneath, the abdomen is sepia, with two yellow spots in front of epigastric fold.