Dr. Murai Éva szerk.: Parasitologia Hungarica 18. (Budapest, 1985)
It is most similar to the Balanorchis-type (EDUARDO, 1982) but differs from it in the absence of sphincter papillae. The acetabulum is characterized by a poorly developed marginal longitudinal muscle layer and the number of muscle units found in DE (42-45, Fig. 18) and VE (22-25, Fig. 19). It is similar to that of the Gastrodiscoides (SEY, 1986b) and the Homalogaster-types but differs from them in having lesser muscle units in the DE and VE muscle layers. It is regarded as a new type, named Hawkesius. Of the amphistomes previously described from Viet Nam, fourteen species (Watsonius noci, Paramphistomum cervi , P. liorchis , Calicophoron cauliorchis, C. ijimai , Orthocoelium or thocoelium, O. streptocoelium , Cotylophoron cotylopho r um , C. in dicum , Gigantocotyle ani- socotyle, G. bathycotyle, G. fraternuro , Gastrothylax glandiformis and G. minutus) have not been revealed during our examinations. The clarification of their real position, presence or absence should be the subject of further studies. A KEY TO SPECIES OF VIETNAMESE AMPHISTOMES 1) Ventral pouch absent 2 Ventral pouch present 14 2) Pharynx with primary pharyngeal sacs 3 Pharynx with pharyngeal bulb and secondary pharyngeal sacs 7 Pharynx without primary pharingeal sacs, pharyngeal bulb and secondary pharyngeal sacs 8 3) Parasites of fishes 4 Parasites of amphibians 6 4) Cirrus pouch normally developed 5 Cirrus pouch strongly developed Platycladorchis microacetabularis 5) A) Testes spherical Amurotrema dombrowskajae B) Testes strongly lobed Neocladorchis multilobular! s C) Testes with some lobes, acetabulum big Platycladorchis macroacetabularis 6) A) Pharynx Subclavatus-type Diplodiscus amphichrus B) Pharynx Megalodiscus-type Diplodiscus mehrai 7) A) Genital opening Noci-type Watsonius noci B) Genital opening Homalogaster-type Homalogaster paloniae C) Genital opening Parvipapillatum-type Gastrodiscoides hominis D) Genital opening Hawkesius-type Hawkesius hawkesi 8) Pharynx Calicophoron-type 9 Pharynx Dicranocoelium-type 12 Pharynx Explanatum-type 13 Pharynx Liorchis-type ."Paramphistomum gotoi 9) Genital opening Papillogenitalis 10 Genital opening other type 11 10) A) Acetabulum Streptocoelium-type Orthocoelium dinniki B) Acetabulum Calicophoron-type Calicophoron papillosum 11) A) Genital opening Ichikawai-type Paramphistomum ichikawai B) Genital opening Epiclitum-type Paramphistomum epiclitum C) Genital opening Calicophoron-type Calicophoron calicophorum D) Genital opening Microbothrium-type Calicophoron microbothrioides 12) A) Genital opening Scoliocoelium-type Orthocoelium scoliocoelium B) Genital opening Gracile-type Orthocoelium dicranocoelium
