Poor-dispersal
Guides
Ligiidae
Rock Lice, Sea Slaters
Ligiidae is a family of large, dorsoventrally flattened terrestrial isopods commonly known as rock lice or sea slaters. These crustaceans inhabit rocky intertidal zones and adjacent coastal habitats, where they hide during daylight hours and emerge at night to scavenge. They represent the sole family within the infraorder Diplocheta and are distinguished from other woodlice by their elongated body form, large size (up to 30 mm), long antennae, and preference for marine-influenced environments. The family exhibits poor desiccation resistance and limited dispersal ability, leading to pronounced population isolation and cryptic genetic diversity across their range.
Spelobia
lesser dung flies
Spelobia is a genus of small flies in the family Sphaeroceridae (lesser dung flies), established by Spuler in 1924. Species in this genus are terricolous, inhabiting the leaf-litter stratum of forest ecosystems. Some species, such as Spelobia polymorpha from Madeira, exhibit poor flying ability and have become island endemics. The genus is distributed across Europe including Scandinavia and has been introduced to other regions.