Proteroiulus

Bachvarova, Darina, Vagalinski, Boyan, Doichinov, Aleksandar & Stoev, Pavel, 2017, New records of millipedes and centipedes from Bulgaria, with an annotated checklist of the Bulgarian myriapods, Zootaxa 4263 (3), pp. 507-526 : 513

Proteroiulus sp.

Material examined ( IBER): 2 ♀♀, Tran Municipality , Lomnitsa village, N 42.521319, E 22.375491, the road to hut Rui, near a river, under the bark of Salix sp., 12.III.2016, leg. P. Mitov, det. BV.

Remarks. These specimens may actually be P. fuscus (Am Stein, 1857) , a species which is widespread across Europe. In Bulgaria it has been twice recorded from subterranean habitats ( Vagalinski & Stoev 2007). However, the two examined females are considerably thinner (0.4 mm diameter at mid-body) compared to the measurements given by Blower (1985) for P. fuscus , namely 0.5–0.9 mm in females. The second known species of the genus, P. broelemanni Lohmander, 1925 , occurs in France and Spain. We don’t exclude the possibility that the examined specimens belong to a yet undescribed species of Proteroiulus but this needs to be confirmed with adult males.