Life History of a Strigeid Trematode, Hysteromorpha triloba (Rudolphi, 1819) Lutz, 1931. I. Egg and Miracidium

A morphological and molecular study of adults and metacercariae ofHysteromorpha triloba(Rudolpi, 1819), Lutz 1931 (Diplostomidae) from the Neotropical region

“…Currently, Hysteromorpha is a genus distributed across the globe as parasite of fish-eating birds (see Hugghins, 1954; Dubois, 1970; Ostrowski de Nuñez, 1970). The taxonomic history of the type species ( H. triloba ) has been unstable since its erection.…”

“…The genus Hysteromorpha Lutz, 1931 currently contains two species, the type species Hysteromorpha triloba (Rudolphi 1819) Lutz, 1931 and H. plataleae Dubinin et Dubinina, 1940 from Russia (see Dubois, 1970). As in other diplostomids, the species H. triloba parasitizes the intestines of fish-eating birds of the genera Phalacrocorax Brisson, Ardea L. and Nyctanassa L. across the globe (Hugghins, 1954; Dubois, 1970). In the Americas, metacercariae have been reported primarily in cyprinid fishes, but they have also been reported in four other fish families: Ictaluridae, Catostomidae, Ariidae and Pimelodidae (see Pérez-Ponce de León et al ., 2007; Drago et al ., 2011; Locke et al ., 2011; Monteiro et al ., 2011), and the planorbid snail Gyralus hirsutus Gould has been reported as the first intermediate host of H. triloba (Hugghins, 1954).…”

Studies on Larval Trematodes Infecting Freshwater Snails in London (U.K.) and Some Adjoining Areas. Part VI. The Gercariae of the “Vivax” Group and the Life History of Cercaria bushiensis n.sp. (=Cyathocotyle bushiensis n.sp.)

“…In having two pairs of lenses the present miracidium agrees with those of Colylurus cornutus (-Strigea tarda) (Mathias, 1925), Diplostomum flexicaudum (Van Haitsma, 1931), Neodiplostomum Iticidum (Park, 1936) and A. arisaemoides (Pearson, 1956). The miracidia of Hysteromorpha triloha (Hugghins, 1954) has one lens on each side, except occasionally when two lenses are found in each pigmented cup. The present miracidium also differs from the other strigeid miracidia, except that of A. arisaemoides, in having the pigment of the two sides fused into one mass.…”

The life history of Fibricola cratera (Barker and Noll, 1915) DuBois, 1932 (Trematoda: Diplostomatidae)

“…In the miracidium of F. lucida, Park (1936) considers the one to several large, floating cells in a germ cell sac located posteriorly as germ cells as well as other large cells lying in the parenchyma. Hugghins (1954) in his work on the life history of Hysteromorpha triloba reported germ cells as being located in three different localities.…”