LAŠTŮVKA & LAŠTŮVKA (2009) schreiben: "The larvae have been found in the leaves of Pyrus amygdaliformis Vill. in Croatia, and adults have been usually collected near Pyrus elaeagrifolia Pallas in Greece, other Pyrus species are also possible host plants. The indistinctly yellow larva forms a narrow, later slightly dilating mine, with dropping accumulation in its first half (fig. 5). All other nepticulid species mining on Pyrus spp. show green larvae, or greenish white in Ectoedemia atricollis (Stainton, 1857) respectively."
fassen den aktuellen Kenntnisstand zusammen: "The distribution of Stigmella irregularis remains insufficiently known. The species has been recorded in Crimea (type locality), the Greek mainland, Crete (van Nieukerken, pers. comm.), Rhodos, Croatia, and Sicily (Laštůvka & Laštůvka 2005). Here recorded for the first time from Croatia, and the first exact faunistic data are supplied for Greece."
PUPLESIS (1994: 61): “Type-material. Holotype: ♂, the Crimea, 20 km W Feodosiya (Karadag Reserve), 2.vi.1987, leg. Budashkin. Paratypes: 1 ♂, the same locality, 24.viii.1986, leg. Budashkin; 2 ♂, the same locality, 10.vi.-2.vii.1987, leg. Budashkin; 2 ♂, the same locality, 2-22.vii.1987, leg. R. Puplesis; 3 ♂, the same locality, 10.vii.1977, leg. S. Reznik; 1 ♂, the same locality, 27.vii.1977, leg. M. Falkovitsh.”