Horologion hubbardi

Harden & Davidson, 2024

Horologion hubbardi is a newly described of from Bath County, Virginia. It represents only the second known species in the Horologion, which was previously known solely from a single collected in West Virginia in 1931. sequence data and morphological analysis place the genus in the supertribe Trechitae, as sister to the Gondwanan tribe Bembidarenini. The species is considered a relict lineage with no close relatives known in the Northern Hemisphere.

Pronunciation

How to pronounce Horologion hubbardi: /hɔːrɔːˈlɔːɡiːˌɒn ˈhʌbərdiː/

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Identification

Distinguished from the only congeneric H. speokoites by geographic separation across the middle Appalachian high mountains. Specific diagnostic morphological characters distinguishing the two species are not detailed in available sources. The Horologion can be recognized by its placement in the tribe Horologionini within .

Habitat

Terrestrial epikarst; specimens collected in or near drip pools in cave systems. The epikarst zone—the network of fissures and small cavities in the bedrock above the main cave passages—is inferred as the true , explaining the extreme rarity of the since this zone has not been directly sampled.

Distribution

Known only from Bath County, Virginia, USA. The occurs on the eastern side of the high mountains of the middle Appalachians, opposite to H. speokoites from West Virginia, suggesting these mountains as the ancestral source.

Behavior

Most specimens were found dead in drip pools, supporting the inference that the inhabits the epikarst zone above cave passages rather than cave interiors proper.

Ecological Role

Important component of Appalachian . Represents a relict lineage (tribe Horologionini) without any close relatives known in the Northern Hemisphere, contributing to the unique subterranean fauna of the Appalachian region.

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