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“Nicoletia” tergata Mills, 1940 is redescribed from new material recently collected in subterranean habitat in Florida as well as examination of some of the type specimens. The species is placed in a new genus Gibboletia within the subfamily Coletiniinae and thus represents the only species of this subfamily so far known in North America. Molecular data (16S rRNA) from one of two populations suggest they may represent different species; however, morphological differences were not found within or between populations. The legs of all specimens from one population reacted with the mounting medium whereas the other population mostly did not, suggesting a physiological difference may exist.

While many cave-adapted organisms tend to be endemic to single locations or restricted to single karstic regions, the troglobitic silverfish insects of genus Texoreddellia can be found in scores of different cave localities that cover a range of nearly 160,000 km

While many cave-adapted organisms tend to be endemic to single locations or restricted to single karstic regions, the troglobitic silverfish insects of genus Texoreddellia can be found in scores of different cave localities that cover a range of nearly 160,000 km 2 . They are among the most important and common representatives of the cave-adapted fauna of Texas and Coahuila, in northern Mexico. Using morphological and mitochondrial gene sequence data, we have corroborated the presence of at least six different species within the genus and provided species identifications to populations inhabiting 153 different cave locations. Results show that species ranges are larger than previously reported and that ranges tend to greatly overlap with each other. We have also found that different species of Texoreddellia commonly inhabit the same cave in sympatry. Data supports that some species of Texoreddellia can easily disperse through the extensive network of cracks, fissures and smaller cavities near the surface and epikarst.