Pseudanophthalmus
Guides
Pseudanophthalmus tenuis
Blue River cave beetle
Pseudanophthalmus tenuis is a small, eyeless ground beetle endemic to karst cave systems in Indiana, United States. Formerly considered to contain multiple subspecies, these have been elevated to full species status under Pseudanophthalmus stricticollis. The species is part of a genus specialized for subterranean life, with reduced visual structures and elongated appendages adapted to darkness.