Philometrids of the southern flounder Paralichthys lethostigma: a multidimensional approach to determine their diversity.

Two species of philometrid nematode, Philometra overstreeti and Philometroides paralichthydis, infect the southern flounder, Paralichthys lethostigma. Individuals of P. overstreeti are located between the teeth and inside the bony part of the branchial arches of the fish.