Dr. Murai Éva szerk.: Parasitologia Hungarica 16. (Budapest, 1983)
Parasit hung. 16. 1983. Reconstruction of the systematics of the family Diplodiscidae Skrjabin, 1949 (Trematoda: Paramphistomata) Dr. Ottó SEY Department of Zoology, Janus Pannonius University, Pécs, Hungary "Reconstruction of the systematics of the family Diplodiscidae Skrjabin, 1949 (Trematoda, Paramphistomata) - Sey, O. - Parasit, hung., 16: 63-89. 1983. ABSTRACT. The scope of the family Diplodiscidae Skrjabin, 1949 was restricted as a result of the revision of the diplodiscid species. Two subfamilies (Diplodiscinae and Opisthodiscinae) have been separated with eigth genera: Diplo discus, Australodiscus , Catadiscus , Dermatemytrema , Progonimodiscus, Pseudodiplodiscus and Megalodiscus , Opisthodiscus ) . Review of the taxa, key to subfamilies, genera and species as well as their zoogeographical affinities were given. KEYWORDS: Diplodiscidae (Trematoda, Paramphistomata), histomorphology systematics, biology, phylogeny, zoogeography, key to subfamilies, genera and species of Diplodiscinae and Opisthodiscinae, Australodiscus gen. nov. The family Diplodiscidae was designated by SKRJABIN in 1949 for several subfamilies of amphistomes as parasitizing, with a few exceptions, lower vertebrates. The species-group of amphistomes, which is regarded to be diplodiscid by the writer, was assigned by SKRJABIN (1949) to two subfamilies Diplodiscinae and Opisthodiscinae while YAMAGUTI (1971) allocated them to several subfamilies (Diplodiscinae, Catadiscinae, Dermatemytrinae, Progonimodiscinae). A study of the evolutionary history of amphistomes indicated (see later) that the taxonomic position of diplodiscids (which are parasites of amphibians and to a lesser extent of reptiles and fishes) is uncertain whereas they have the characteristic features of their own in-group and out-group alike. Hence, the scope of Diplodiscidae had to be re-classified and, accordingly, it was restricted by the writer only to two subfamilies. Diplodiscinae and Opisthodiscinae (but with content different from each of SKRJABIN' s taxa). The rest of the subfamilies of SKRJABIN' s Diplodiscidae were assigned toother families and those with the Diplodiscidae, in the sense of the present paper, were gathered under the newly established superfamily. Diplodiscoidea (a proposed classification of amphistomes will be published in a separated paper in the near future) . Established by COHN (1904), the subfamily Diplodiscinae was included three genera, Diplodiscus Diesing, 1836; Opisthodiscus Cohn, 1904 and Catadiscus Cohn, 1904. Subsequently, the scope of the subfamily has considerably been altered by three different taxonomic procedures; 1) discovery of newer species and genera; 2) transferring and re-naming as well as; 3) removal of taxa from the subfamily. 1) After designation of the Diplodiscinae the following genera, based on originally recovered amphistomes, were added: Megalodiscus Chandler, 1923 from amphibians; Dermatemytrema Price, 1937 from turtles and Pseudodiplodiscoides Murty, 1970 from snails. 2) The genus Helostomatis Fukui, 1929 was transferred into Diplodiscinae by SOUTHWELL and K1RSHNER (1937); YAMAGUTI (1958) created the genus Pseudopisthodiscus for Opistho discus americanus Holl, 1928; VERCAMMEN-GRANDJEAN (1960) re-named Diplodiscus doyeri Ortlepp, 1926 and placed it to the newly established genus Progonimodiscus ; MANTER (1962) emended the genus Pseudodiplodiscus which was designated by SZIDAT(1939) for Diplo discus cornu (Diesing, 1836) and all of them were classified under Diplodiscinae.
