Haplophthalmus montivagus, also known as the southern ridgeback, is a species of woodlouse that belongs to the family Trichoniscidae. This species can be found in Europe.
Taxonomy This species contains a single subspecies: Haplophthalmus montivagus austriacus Verhoeff, 1941
Description This species has distinct longitudinal dorsal ridges and a pair of dorsal projections located on the third pleonite.Hughes, Thomas & Hill, David. (2020). The discovery of Haplophthalmus montivagus Verhoeff, 1941 (Isopoda: Oniscidea) at Treborth Botanic Garden, North Wales. 32. 65-67.
It is difficult to differentiate this species from Haplophthalmus mengii (Menge’s Ridgeback) and this species identification requires dissection and microscopic examination of males.
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