Anillinus choestoea
Barr, 1962
Anillinus choestoea is a small, eyeless ground beetle in the Carabidae, described by Thomas C. Barr in 1962. It belongs to a of anilline beetles characterized by reduced or complete anophthalmia, elongated bodies, and subterranean habits. The is known from cave and deep soil in the Appalachian region of the eastern United States. Like other members of Anillinus, it exhibits morphological adaptations for life in darkness, including depigmentation and elongated appendages.
Pronunciation
How to pronounce Anillinus choestoea: /ænɪˈlaɪnəs koʊˈstoʊiə/
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Identification
Distinguished from surface-dwelling trechine beetles by complete absence of and pale coloration. Separated from other Anillinus by male genitalia structure ( ), which Barr (1962) used as the primary diagnostic character. The specific epithet refers to the type locality. Comparison with sympatric Anillinus species requires examination of aedeagus shape, elytral microsculpture, and body proportions.
Habitat
Subterranean: known from cave and deep soil litter in karst regions. Occupies dark, humid microhabitats with stable temperature and high humidity. Associated with limestone cave systems and mesic forest soils.
Distribution
Known from the type locality in Towns County, Georgia, USA, and potentially additional cave systems in the southern Appalachian Mountains. to the eastern United States.
Behavior
Subterranean, with movement patterns restricted to soil matrix and cave passages. Likely exhibits slow, deliberate locomotion typical of anilline beetles. Activity patterns unknown; presumed active year-round in stable cave environments.
Ecological Role
or scavenger in subterranean ; likely consumes small and organic detritus. Contributes to nutrient cycling in cave through consumption and processing of organic matter.
Human Relevance
Subject of biospeleological research; contributes to understanding of cave biodiversity and subterranean evolution. No direct economic or agricultural significance. Vulnerable to groundwater pollution and disturbance from cave development.
Similar Taxa
- Anillinus species (other)Other members of the share eyeless condition and subterranean habit; distinguished by male genitalia and subtle differences in body proportions and microsculpture.
- AnillodesRelated of eyeless trechines; separated by differences in pronotal shape, elytral structure, and distribution (Anillodes primarily western North America).
- TrechusSurface-dwelling trechines often sympatric; possess functional , darker pigmentation, and shorter appendages relative to body size.
More Details
Taxonomic History
Described by Thomas C. Barr in 1962 based on specimens from Towns County, Georgia. The specific epithet 'choestoea' derives from the Cherokee name for the region. Barr's work established the modern concept of Anillinus as a distinct within the Bembidiini.
Conservation Status
Not formally assessed by IUCN. Vulnerable due to restricted range, specific requirements, and threats to cave including pollution, hydrological alteration, and recreational caving impacts.