Dr. Murai Éva szerk.: Parasitologia Hungarica 16. (Budapest, 1983)

Diagnosis. Diplodiscinae. Body pyriform in shape. Primary pharyngeal sacs prominent, oesophagus with well developed bulb. Caeca short, terminating post equatorial. Testis single, median or submedian, intercoecal, pre-equatorial. Cirrus pouch present, well developed. Genital opening just behind bifurcation. Ovary submedian, posttesticular. Vitelline follicules numerous, extending along caeca and grouped behind caecal ends. Uterine coils usually intercaecal, occasionally more extensive; eggs embryonated. Acetabulum ventroterminal with accessory sucker. Excretory pore at body end. Type and single species: Australodiscus megalorchus (Johnston, 1912) nov. comb. (Fig. 21) Catadiscus Cohn, 1904 The first species of this genus was described by COHN (1903) in South America from a snake, although representatives of this genus are predominantly parasites of amphibians. The genus comprises fifteen species. They are: Catadiscus dolichocotyle (Cohn, 1903); C. bathracorum Cordero, 1926 ; D. pygmaeus (Lutz, 1928); C. cohni Travassos, 1926; C. uruguayensis Freitas et Lent, 1939; C. inopinatus Freitas, 1941; C. marinholutzi Freitas et Lent, 1939; C. freitaslenti Ruiz, 1943; C. mirandai Freitas, 1943; C. propinguus Freitas et Dobbin, 1956; C. corderoi Mané-Garzon, 1958; C. rodriguezi Caballero, 1955; C. eldoradiensis Artigas et Pérez, 1964; C. longicoecalis Paumarau, 1965 and C. rockai Correa et Artigas, 1978. Species of this genus are rather poorly studied. The taxonomic value of such morphological features as the asymmetrical vitellaria, double or single was deferens, ratio of certain organs to each other need further examinations. The histomorphology of the muscular organs has not yet been examined in any of these species. Thus, the weakness of the characters of these species is also reflected in the key constructed for them. Diagnosis. Diplodiscinae. Body conical or pyriform in shape. Primary pharyngeal sacs prominent, oesophagus with bulb. Caeca short, terminating at equatorial level, rarely longer. Single testis present, median or submedian, situated intercaecal or just behind level of caecal end. Vas deferens single or double. External seminal vesicle and cirrus pouch present. Genital opening bifurcal or postbifurcal. Ovary submedian, posttesticular. Vitellaria symmetrical or rarely asymmetrical, follicules large, extending on each side behind caeca or partly overlapping them, rarely confluent anteriorly or posteriorly. Uterine coils between acetabulum and caecal arch may often reaching to lateral margins of body. Acetabulum ventroterminal, contrcited into two portions, without accessory sucker. Intestinal parasites of amphibians and reptiles. Type species: Catadiscus dolichocotyle (Cohn, 1903) (Fig. 22). Key to species of Catadiscus 1. Caeca short 2 - Caeca long C. longicoecalis 2. Vitellaria symmetrical 3 - Vitellaria asymmetrical C. eldoradiensis 3. Vitellaria confluent anteriorly 4 - Vitellaria separated anteriorly 5 4. Pharynx/acetabulum ratio bigger than 1:3 C. marinholutzi - Pharynx/acetabulum ratio smaller than 1:3 C. propinguus The name was only designated to this species without description.