Pseudochristionella elegantissima sp. nov. (Cestoda: Trypanorhyncha) is described
from the spiral valves of the rays Dasyatis brevis (Garman, 1880) and D. longus (Garman,
1880), from the Gulf of California, Mexico. Also described is P. nudisculo sp. nov.
from rays Rhinobatos productus Ayres, 1854, D. longus, Myliobatis longirostris Applegate
& Fitch, 1964 and Zapteryx exasperat (Jordan & Gilbert, 1880) from the same location.
The species are distinguished from one another and from the only existing species
within the genus, P. southwelli Campbel & Beveridge, 1990, by differences in the arrangement
of bill-hooks on the external surface of the basal swelling of the tentacle and by
the number of hooks in each row of the metabasasl armature.