[3] Hybodont egg cases (Palaeoxyris) associated with juvenile teeth of L. ferganensis in the Triassic lake deposits of the Madygen Formation of Kyrgyzstan suggests that this species spawned in freshwater environments,[4] with Palaeoxyris egg cases found in freshwater deposits of the Late Triassic Chinle Formation in North America suggested to have been produced by Lonchidion humblei.

[5] While the genus is primarily known from teeth, a preserved body impression of a subadult individual is known from the Early Cretaceous freshwater Las Hoyas site in Spain.

[6] Other possible body remains of Lonchidion have been reported from other Early Cretaceous sites in Spain.

[7][8] Lonchidion humblei is suggested to have reached an adult length of 25 centimetres (9.8 in).

[9] The teeth of the genus are low crowned, and probably served to grind hard prey (durophagy).