ARMADILLIDIIDAE Brandt, 1833

Hyžný, M & Dávid, A, 2017, A remarkably well-preserved terrestrial isopod (Peracarida: Isopoda: Armadillidiidae) from the upper Oligocene of Hungary, with remarks on the oniscidean taphonomy, Palaeontologia Electronica 20 (1), pp. 1-11 : 3

Family ARMADILLIDIIDAE Brandt, 1833

Remarks. Apparently, the Hungarian specimen was able to roll up into a ball, thus, it belongs to conglobating isopods. The general habitus of the specimen in question may fit to several oniscidean families, including Armadillidae , Armadillidiidae , or Eubelidae . One of the autapomorphies of the Eubelidae is sulcus arcuatus, a longitudinal grove on the first coxal plate ( Taiti et al., 1991; Schmidt, 2003). The studied specimen does not possess this character, and hence its potential attribution to Eubelidae is disputed. The uropods of armadillidiids differ from the uropods of other conglobating Oniscidea : their exopodite is plate-like, truncate posteriorly. The exopodite fills out the gap between the pleotelson and the pleon-epimera 5, and their truncate apical margin is part of the body outline ( Schmidt, 2003). Unfortunately, the Hungarian specimen does not retain uropods. The pleotelson, however, is partly preserved and its outline is undoubtedly triangular, as it is typical for armadillidiids ( Schmidt, 2003), rather than quadrangular, which is typical for armadiliids ( Schmidt, 2003). As a conclusion, the Hungarian specimen is assigned to the family Armadillidiidae . Up to now, only a handful of veritable occurrences of this family are known from the fossil record ( Table 1).