Barker 1999a distinguished this species from the very similar D. leucosticta by its dark green head and pronotum (cf. bronze-green or coppery), black elytra (cf. brown or bronze) and narrower and parallel-sided aedeagus (cf. wider and rounded).

Very closely related to D. leucosticta. Until recently, D. robertfisheri has been known only from the type collections comprising three specimens collected at Melrose in the southern Flinders Ranges by R.H. Fisher in 1978 and 1986.

Searches of the adult host plants at Melrose conducted over many years failed to produce any more records. In March 2023, Matthew Endacott discovered 3 females that are a reasonable match to this species. They were found on the same host plant species near Terowie, in the Northern Mt Lofty Ranges Region.

Also, I uncovered a matching early collection in the SA Museum labelled as Blackburn's collection, with the locality merely given as 'Australia'. Several early collections for other Buprestid species attributed to Blackburn are from Quorn, and this is a plausible possible location, being 55 km N of Melrose and with similar habitat.

The type collection adults, and the more recent records, were all collected on Elegant Wattle (Acacia victoriae). Significantly, D. leucosticta has also been collected at Melrose, but was taken there on Golden Wattle (Acacia pycnantha). The widely distributed D. leucosticta is known from a number of different Acacia species, but D. robertfisheri appears to have developed as a form specifically adapted to Acacia victoriae.