Cestodes of the genus Aploparaksis Clerc, 1903 (Cyclophyllidea, Aploparaksidae) reported from gulls, with a description of new species Author Bondarenko, Svetlana Author Kontrimavichus, Vytautas text Journal of Natural History 2006 2006-12-30 40 47 - 48 2589 2610 http://dx.doi.org/10.1080/00222930601114168 journal article 10.1080/00222930601114168 1464-5262 5230282 Aploparaksis (Aploparaksis) rissae Schiller, 1951 ( Figure 4 ) Synonyms: Aploparaksis filiformis Spassky, 1963 , pp. 144–146 , Figures 37–38 not Aploparaksis filiformis of Hromada and Macko, 1995 , pp. 59–60, Figure 4 . Aploparaksis daviesi Deblock and Rausch, 1968 , pp. 436–437 , Figure 4 . Hosts. Rissa tridactyla (Linnaeus) , also shorebirds of the genera Arenaria , Gallinago , Limnodromus . Intermediate hosts. Styloscolex sokolskayae Morev (Lumbriculidae) , Rhyacodrilus coccineus (Vejd) (Tubificidae) , Bryodrilus arcticus and Mesenchytraeus sp. (Mesenchytraeidae) , experimentally ( Bondarenko 1993 ). Figure 4. Aploparaksis rissae Schiller, 1951 , a type from Rissa tridactyla , Alaska: (A) scolex, (B) hooks, (C) hermaphroditic proglottis, (D) cirrus. Scale bars: 100 mm (A, C), 50 mm, (D) 20 mm (B). Metacestode. Ramicercus ( Bondarenko 1993 ). Localities. Russia ( Yakutiya , Chukotka , Kamchatka , the Wrangel Island ), USA (Alaska, state Washington) . Material studied. Type specimen ( USNPC 47086 , Rissa tridactyla , St. Lawrence Island , Alaska ) . Supplement to the description by Schiller (1951a) , based on the type specimen ( Figures 4A– D ). Scolex 200× 90 mm . Suckers 70–80 mm in diameter. Rostellum 90× 60 mm , rostellar sheath 200× 70 mm . Length of hook 21 mm (length of blade 12, length of base with guard 16 mm ); width of hook 10 mm . Testis 100× 60 mm , slightly antiporal. Cirrus sac 205– 230× 25–29 mm , crosses median line. Cirrus reaches 151 mm in length, maximum width in proximal part 8 mm . Approximately one-third of cirrus length covered with relatively large sparsely distributed spines. Seminal receptacle oval, 70× 50 mm , vagina tubular, 110 mm long. Mature uterine proglottides absent. Remarks. Aploparaksis rissae was known for long only from its original description ( Schiller 1951a ). Re-examination of the type specimen by Bondarenko (1993) shows that the hermaphroditic proglottis of A. brachyphallos was described and pictured by Schiller as a proglottis of A. rissae . Inaccuracies which have been admitted in the original description of A. rissae did not give any reasons for Spassky (1963) , in describing A. filiformis , and Deblock and Rausch (1968) , in describing A. daviesi (both species were described from shorebirds), to differentiate them from A. rissae . Bondarenko (1975) first believed that A. daviesi was a synonym of A. filiformis , and later, having investigated type-specimens of both species, came to the conclusion ( Bondarenko 1993 ) that they are similar to A. rissae . For the morphology of A. rissae , and data about its life-cycle, see Bondarenko (1975 , 1993 ).