Darlingtonea kentuckensis

Valentine, 1952

A troglobitic cave to eastern Kentucky karst systems. measure 7.3–7.7 mm. The exhibits surprisingly broad thermal (threshold ~20–24°C, mortality at 30°C within 24 hours), suggesting remnant physiological characteristics from epigean ancestors. However, it shows extreme specialization for constant high-humidity environments, with survival declining dramatically below 100% relative humidity and mortality within 3 days at 50–80% RH. densities can exceed 100 individuals per sand bank in suitable cave .

Darlingtonea kentuckensis (10.3897-subtbiol.34.46348) Figure 2 by (photo by Dr. Matthew Niemiller) Boyd OF, Philips TK, Johnson JR, Nixon JJ (2020) Geographically structured genetic diversity in the cave beetle Darlingtonea kentuckensis Valentine, 1952 (Coleoptera, Carabidae, Trechini, Trechini). Subterranean Biology 34: 1-23. https://doi.org/10.3897/subtbiol.34.46348. Used under a CC BY 4.0 license.

Darlingtonea kentuckensis (10.3897-subtbiol.34.46348) Figure 7 by Boyd OF, Philips TK, Johnson JR, Nixon JJ (2020) Geographically structured genetic diversity in the cave beetle Darlingtonea kentuckensis Valentine, 1952 (Coleoptera, Carabidae, Trechini, Trechini). Subterranean Biology 34: 1-23. https://doi.org/10.3897/subtbiol.34.46348. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Darlingtonea kentuckensis: /dɑːˈlɪŋtəˌniːə kɛnˈtʌkensis/

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Identification

A small, eyeless cave (7.3–7.7 mm) in the Darlingtonea. Distinguished from other eastern North American cave carabids by its restricted distribution in Kentucky karst and genetic differentiation from other Trechini. The combination of small size, complete eyelessness, and occurrence in Mississippian karst caves of eastern Kentucky separates it from superficially similar troglobitic carabids in neighboring regions.

Images

Habitat

Mississippian karst hypogean caves, particularly sand banks within caves. Requires constant high humidity (~95–100% RH) and stable temperatures (~12°C). Found along the escarpments of the Mississippian and Cumberland plateaus on the eastern flank of the Cincinnati Arch karst system in eastern Kentucky.

Distribution

Eastern Kentucky, USA. Documented from 27+ cave across the Mississippian Plateau, Pennyroyal region, and Southern Appalachians. Specifically recorded from Wind Cave, Pulaski County, Kentucky.

Diet

Cave cricket (Hadenoecus sp.) . Frozen Drosophila accepted under laboratory maintenance conditions.

Host Associations

Hadenoecus sp. - preycave cricket, prey

Behavior

Active at typical cave temperature (12°C) but shows reduced feeding activity. Behavioral changes observed at higher temperatures. Highly specialized for constant high-humidity environments with limited physiological plasticity for desiccation stress.

Ecological Role

Top terrestrial in Mississippian karst hypogean . Achieves significant densities (100+ individuals per sand bank) where habitat conditions are suitable.

Human Relevance

Vulnerable to climate change impacts due to narrow humidity . Rising temperatures and diminishing groundwater availability threaten its specialized cave . Serves as a model organism for studying physiological limits of troglobitic specialization and climate vulnerability in subterranean .