Cairaeanthusgen. n. (Cestoda, Rhinebothriidea), with the Description of Two New Species fromDasyatis pastinacain the Black Sea and the Sea of AzovTwo new species were identified among cestodes collected fromDasyatis pastinaca(Linnaeus, 1758) in the Black Sea and the Sea of Azov. Their morphology corresponds in the most characters to the descriptions ofPhyllobothrium lactucavan Beneden, 1850 andP. gracilisWedl, 1855 by L. Borcea (Borcea, 1934) and T. P. Pogorel'tseva (Pogorel'tseva, 1960) from the same host and seas. However, some morphological characters of these cestodes (namely, the marginal loculi on the pedicellate bothridia, cephalic peduncle, absence of the apical sucker and post-poral testes, genital pore opening marginally, close to posterior end of proglottid) correspond to diagnosis of Rhinebothriidea. Since the species from the Black Sea and the Sea of Azov did not fit diagnoses of any known genera currently belonging to Rhinebothriidea, the new genus,CairaeanthusKornyushin et Polyakova, gen. n., with two species,C. ruhnkeiKornyushin et Polyakova, sp. n. andC. healyaeKornyushin et Polyakova, sp. n., is established.Cairaeanthusgen. n. differs fromAnthocephalumLinton, 1890 in absence of apical sucker, posteriorly bifid bothridia and vitelline fields interrupted by the ovary, not extending in the posterior end of the proglottid. The new genus can be distinguished fromRhinebothriumLinton, 1890,Echeneibothiumvan Beneden, 1850,RhabdotobothriumEuzet, 1953,RhinebothroidesMayes, Brooks et Thorson, 1981,ScalithriumBall, Neifar et Euzet, 2003 by the absence of facial loculi on the bothridia and by numerous vitelline follicles, stopping at the anterior margin of the ovary; fromRhodobothriumLinton, 1889 - by absence of post-poral testes, and fromSpongiobothriumLinton, 1889 - by numerous vitelline follicles, stopping at the level of ovary.C. ruhnkeisp. n. differs fromC. healyaesp. n. in the lengths of the strobila, the cephalic peduncle and the bothridia pedicel, in size of marginal loculi and the ovary, in the number of the proglottids and the testes in the proglottid, and in the structure of genital atrium. Two new species are differentiated also from the morphologically related speciesPhyllobothrium pastinacaeMokhtar-Mocamouri, Zamali, 1981. Examined type specimens ofP. pastinacaewere attributed to Rhinebothiidea based on a set of morphological characters. However, they appear to differ from all known Rhinebothriidea, including the species from the generaAnthocephalumLinton, 1890 andCairaeanthusgen. n. Taxonomic position ofP.pastinacaeneeds further identification.
The polyclad fauna (Platyhelminthes, Rhabditophora) of the Sinop Peninsula (Black Sea, Turkey) with the description of a new species of Cryptocelis Lang, 1884
