Distribution of Montenegrina hiltrudae. M. hiltrudae costulata (empty circle with dot); M. hiltrudae dennisi (triangle); M. hiltrudae densicostulata (triangle pointing right); M. hiltrudae desaretica ssp. n. (empty circle); M. hiltrudae fusca (square); M. hiltrudae hiltrudae (triangle pointing left); M. hiltrudae maasseni (inverted triangle); M. hiltrudae protruda (empty triangle); M. hiltrudae robusta (diamond); M. hiltrudae sattmanni (circle); M. hiltrudae selcensis ssp. n. (star).