Shell minute, up to 4.5 mm in length, elongate-ovate, teleoconch 0f 4,5 whorls which are sub-angulate at sutures, protoconch (missing in adult specimens) of 1,25 smooth embryonic whorls in juvenile individuals. Whorls sculptured with moderately large, round nodules which are connected to each other by axial ribs which are prominent on early whorls but become less thick and concave between nodules on body whorl; penultimate whorl with 3 spiral rows of nodules, anterior row of nodules pressed against and partly covered by suture, body whorl with 4 rows of nodules. Axial ribs number from 13-14 on the penultimate and the body whorl and extremely fine, macroscopic longitudinal striae are visible in some individuals, spiral sculpture absent. Aperture about equal in height to the spire, smooth within, columella not calloused and with 3 strong, oblique folds, first two posterior folds become thick and rope-like and extend onto the siphonal fasciole towards the dorsal side. All specimens white to creamy-white in colour.

TYPE LOCALITY. Great Australian Bight, 33°05*S and 128'40'E, in 75 m.
Holotype. length 4.2 mm, width 1.9 mm

There is no similar Australian or New Zealand species with which A. minutenodosa could be compared. The only superficially similar species, belonging to a different genus, is Vexillum (Costellaria) nodospiculum Cernohorsky, 1970, from deep water in the Philippines, but that species is considerably more fusiform with a conical protoconch of 3,5 embryonic whorls, 2 sutural rows of spikey nodules on the penultimate whorl, differently formed axial ribs and spiral sculpture. Although the new species is described on the basis of specimens collected devoid of animals, it is so distinct from any known Austromitra to warrant description on the basis of the present material.