Habitat of species of Horologion A surface habitat at Williams Cave, Bath Co., VA B C. Harden (yellow helmet) and T. Malabad (red helmet) in microhabitat of H. hubbardi voucher CWH-452 in Williams Cave C C. Harden examining live H. hubbardi holotype in Williams Cave D live holotype male of H. hubbardi on surface of drip pool in Williams Cave E surface habitat at Arbuckle Cave, Greenbrier Co., WV F T. Malabad examining flowstone in Arbuckle Cave. Photo credit: C. Harden (A, E), K. Kosič Ficco (B–D), M. Miller (F).