Anillinus langdoni
Sokolov & Carlton, 2004
Anillinus langdoni is a small ground beetle in the tribe Bembidiini, described in 2004. It belongs to the A. langdoni group, which includes four species with three to the Great Smoky Mountains region. The species is distinguished from primarily by male genitalia and female spermathecal shape. Phylogeographic studies suggest its distribution reflects historical altitudinal shifts of corridors and watershed-mediated isolation.
Pronunciation
How to pronounce Anillinus langdoni: /ænˈɪlɪnəs ˈlæŋdoni/
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Identification
Requires examination of male genitalia () for definitive identification; female spermathecae provide secondary diagnostic characters. Distinguished from other members of the A. langdoni group (A. cieglerae, A. pusillus, and the South Mountains species) by specific structural features of these reproductive organs. External alone is insufficient for species-level identification within this group.
Appearance
A minute ground beetle typical of the Anillinus. Diagnostic features include specific characters of the male and the shape of the female spermathecae. As with other Anillinus , it is likely eyeless or with highly reduced and pale in coloration, though explicit morphological description for this species is not detailed in available sources.
Habitat
Montane forest environments of the southern Appalachian Mountains. Associated with the Great Smoky Mountains and adjacent mountain systems, where it likely inhabits moist forest floor microhabitats typical for anilline ground beetles. Specific microhabitat preferences (e.g., soil type, moisture regimes, elevation bands) are not explicitly documented.
Distribution
to the Great Smoky Mountains and adjacent mountains of western North Carolina and eastern Tennessee, USA. The A. langdoni group includes a fourth species from the South Mountains of middle North Carolina, but A. langdoni itself is restricted to the Great Smoky Mountains region.
Ecological Role
Presumably functions as a micro- or in forest floor , typical of small carabid beetles, though specific ecological role has not been studied.
Similar Taxa
- Anillinus ciegleraeMember of the same group, distinguished by male and female spermathecal ; to Great Smoky Mountains National Park
- Anillinus pusillusMember of the same group, distinguished by male and female spermathecal ; to Great Smoky Mountains National Park
- Other Anillinus species outside the langdoni groupDistinguished by phylogenetic placement and geographic distribution; the langdoni group is to the southern Appalachians
More Details
Phylogeography
The A. langdoni group has been subject to phylogeographic analysis using both aedeagal and COI gene sequences, which yielded conflicting phylogenetic hypotheses. The COI-based was more consistent with geographic distribution patterns.
Speciation Mechanisms
Diversification within the group may have been driven by ecological constraints, altitudinal fluctuations of corridors during past climate changes, and local watersheds acting as fine- isolating mechanisms.
Taxonomic History
Described by Sokolov & Carlton in 2004; the group was subsequently characterized in 2007 with the description of two additional species from Great Smoky Mountains National Park.