Dr. Murai Éva szerk.: Parasitologia Hungarica 16. (Budapest, 1983)
Accordingly, it seems to be well established that D. subclavatus is not found south of the Sahara. North of the Sahara there are some reports of its occurrence (JOYEUX, 1923; BALOZET and CALLOTT, 1938 from Tunis). Planorbis philippii was found to be intermediate host in this area (JOYEUX, 1923). On the basis of the above analysis, the following species are found in Africa: Diplodiscus subclavatus (Goeze, 1782) D. fischthalicus Meskal, 1971 Syns: D. magnus of Fischthal and Thomas, 1968 D. subclavatus of Pike, 1979 D. subclavatus of Skrjabin, 1916 D. brevicoeca Richard, Chabaud et Brygoo, 1968 D. pallascatus Manter et Pritchard, 1964 Diagnosis. Diplodiscinae. Body conical in shape. Pharynx Microrchis-type, primary pharyngeal sacs in pharynx or prominent. Oesophageal bulbus present; caeca strait or wide, rarely constrictions dividing to parts, reaching near to acetabulum. Testis single, equatorial or post-equatorial, median or slightly out of median line. Genital opening median, on a level with bifurcation or posterior to it; Subclavatus type. Cirrus pouch present, slightly developed, rarely well developed. Ovary submedian, posttesticular; uterin coils intercaecal. Vitellaria extending along caeca, at caecal ends turning inwards. Excretory vesicle saccular, with one pair of collecting vessels, excretory pore preacetabular . Parasitic in rectum of amphibians. Type species: Diplodiscus subclavatus (Goeze, 1782) (Fig. 20). Key to species of Diplodiscus 1. Primary pharyngeal sacs prominent 2 - Primary pharyngeal sacs inside pharynx 8 2. Measurements of cirrus pouch equal with pharynx D. pallascatus - Cirrus pouch smaller than pharynx 3 3. Ovary post-caecal D. brevicaeca - Ovary before ceacal end 4 4. Caeca sacculated D. sacculosus - Caeca straight 5 5. Genital opening behing bifurcation 6 - Genital opening at level of bifurcation 7 6. Vitellaria confluent anteriorly D. amphichrus - Vitellaria separated anteriorly D. magnus 7, Pharynx Microrchis-type, eggs in proximal part of uterus not embryonated D. fischthalicus - Pharynx Megalodiscus-type, eggs in proximal part of uterus embryonated D. mehrai 8. Descending and ascending canals of excretory system connected by cross-vessels D. chauhani - Descending and ascending canals of excretory system not connected with vessels D. lali Diplodiscus conicum (sic) Polonio, 1859 and D. sphincteristoma Belous, 1952 are nomen nudum . Australodiscus gen . nov . JOHNSTON (1912) described two species of amphistomes, Diplodiscus megalorchus and D. microrchus from Australian amphibians. They were characterized be the presence of single
