Endemic to eastern and central United States, including both widespread and isolated, highly endemic relicts [details]
Former glaciated areas of the United States Central Lowland. The most widespread species of the genus [details]
Hypogean [details]
Stygobiont: caves, springs, seeps, drainage systems in glaciated areas [details]
Stygobiont. Exclusively in non-karst habitats (unlike other Bactrurus) [details]
Stygobiont: caves, seeps, deep cistern [details]
Sexually dimorphic telson in five out of seven species of the genus [details]