Dr. Murai Éva - Gubányi András szerk.: Parasitologia Hungarica 28. (Budapest, 1995)

Bianium Stunkard, 1930 Syns Diploproctodaeum La Rue, 1926 (in part), Diploporus Ozaki, 1928 (in part), Amarocotyle Travassos, Freitas et Bührnheim, 1965 B. plicitum (Linton, 1928) Stunkard, 1930 Syns Bianium concavum Stunkard, 1930 B. adplicatum Manter, 1940 B. madrasi Gupta, 1968 B. hemistoma (Ozaki, 1928) Yamaguti, 1934 Syns Diploporus hemistoma Ozaki, 1928 Bianium holocentri Yamaguti, 1942 B. lecanocephalum Perez-Vigueras, 1955 B. te t radont is Nagaty, 1956 B. vitellosum (Soganderas-Bernal et Hutton, 1959) Gupta, 1968 Syn. Diploproctodaeum vitellosum Soganderas-Bernal et Hutton, 1959 B. simonei (Travassos, Fraitas et Bührnheim, 1965) Yamaguti, 1971 Syn. Amarocotyle simonei Travassos, Freitas et Bührnheim, 1965 B. puri Gupta, 1968 B. abalistidis Reimer, 1981 B. arabicum sp. n. The newly described species, Bianium arabicum sp. n., differs from all of the known species of the genus in having lateral folds along the margins of the body. This species is closest to the species B. simonei but distinguishable from it by its shorter lateral folds (they end at the level of the anterior testis), ratio of suckers, position of vitellaria and the structure of the distal part of the male reproductive organ. Its name refers to its locality. Among the species now allocated to the genus Bianium, two morphologically different species-groups can be easily recognized. One of them includes the species B. hemistoma and B. lecanocephalum in which the forebody is well distinguished (spoon-like) but the lateral folds are not confluent midventrally. In species of the other group, the body is uniform and not dividable. Therefore, an effort towards the appl ication of the monophy letic group designation of two subgenera (Bianium Stunkard, 1930 subgen. n. and Pseudobianium subgen. n.) is recommended. Taking the present framework and extent of the genus Bianium into account, an amended description of it is proposed. Lepocreadiidae, Diploproctodaeinae. Body either dividable or uniform; forebody with lateral folds, turn over ventrally and posteriorly but not unite in midventrally. Oral sucker, pharynx and ventral sucker well developed, prepharynx and oesophagus short or absent. Ani either present or absent; if present, caeca opening outside at posterior excremity. Testes tandem or slightly diagonal. Vesicula seminalis interna and externa present. Cirrus pouch claviform extending posterior to acetabulum, including seminal vesicle, pars prostatica and eversible ductus ejaculatorius. Genital orjening at acelabular zone, sinistral or rarely dextral. Ovary lobed, rarely spherical, median or submedian, pretesticular. Uterine coils between ovary and acetabulum, metraterm simple but well differentiated, left side of cirrus pouch. Vitellaria strongly developed, in lateral fields from oral sucker to posterior exctremity confluent behind testes. Excretory vesicle tubular, reaching to acetabulum. Intestinal parasites of marine fishes.