Haplophthalmus danicus, also known as the terrestrial cave isopod or spurred ridgeback isopod, is a species of woodlouse that belongs to the family Trichoniscidae. It is naturally found in Europe, Southern Asia, and temperate Asia, however it has been introduced to North America. This species was likely introduced during original European settlement, and therefore has been well established in terrestrial communities.
Subspecies These seven subspecies belong to the species Haplophthalmus danicus: Haplophthalmus danicus armenius Collinge, 1918 Haplophthalmus danicus bagnalli Collinge, 1946 Haplophthalmus danicus danicus Budde-Lund, 1880 Haplophthalmus danicus rufus Arcangeli, 1960 Haplophthalmus danicus tauricus Frankenberger, 1950 Haplophthalmus danicus transsilvanicus Verhoeff, 1908 Haplophthalmus danicus virescens Collinge, 1918
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