Ligidium blueridgensis
Schultz, 1964
Ligidium blueridgensis is a terrestrial isopod in the Ligiidae, described in 1964 from specimens collected in the southern Ridge Mountains. The species exhibits a disjunct distribution across multiple biogeographical barriers in Georgia, North Carolina, South Carolina, and Tennessee, with deeply divergent mitochondrial lineages suggesting long-term persistence and diversification in the region. It is one of several morphologically similar Ligidium species in the southern Appalachians.
Pronunciation
How to pronounce Ligidium blueridgensis: //lɪˈɡiːdiəm bluːrɪdˈdʒɛnsɪs//
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Identification
Distinguished from the morphologically similar Ligidium pacolet and Ligidium whiteoak by the slender projection on the end of the male second pleopod endopodite, which rises from the inner tip corner of the surface and points caudally and inwards. Unlike L. pacolet, the male pleopod endopodite of L. blueridgensis does not broaden in the final third of its length.
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Habitat
Found in forest floor microhabitats, specifically under rotten logs in mesic mountain environments.
Distribution
Southern Ridge Mountains of the southeastern United States: Georgia, North Carolina, South Carolina, and Tennessee. The distribution spans several biogeographical barriers that other southern Appalachian Ligidium do not cross.
Similar Taxa
- Ligidium pacoletMorphologically very similar; distinguished by male second pleopod endopodite structure and width pattern
- Ligidium whiteoakMorphologically very similar; distinguished by male second pleopod endopodite projection structure
More Details
Phylogeography
The shows deeply divergent mitochondrial lineages delineated by biogeographical barriers, suggesting an old presence and diversification within the southern Ridge Mountains. This pattern indicates the species has persisted across multiple barriers that limit in other regional Ligidium species.