Five new species of the genus Trichodrilus are described: Trichodrilus
longipenis sp. n., T. rouchi sp. n., T. capilliformis sp. n, and T. a
ngelieri sp. n. from hyporheic waters of the Iberian Peninsula and Fra
nce, and T. bonheurensis sp. n. from superficial waters of France. The
new taxa contribute with some new features to an amended diagnosis of
the genus: presence of modified penial setae, four pairs of spermathe
cae, hair-like dorsal setae and glandular pads in the epidermis.