Based on previous molecular phylogenetic analyses, Bothriocestus n. gen. is erected to accommodate bothriocephalid tapeworms that have an elongate scolex, a well-developed apical disc, and a narrow neck region, parasitize freshwater fishes in the Holarctic, and were previously placed in the polyphyletic genus Bothriocephalus Rudolphi, 1808 (Cestoda: Bothriocephalidea). Bothriocestus claviceps (Goeze, 1782) n. comb., a parasite of eels (Anguilla spp.) in the Holarctic region, is designated as the type species. Another species of the new genus, Bothriocestus cuspidatus (Cooper, 1917) (syn. Bothriocephalus cuspidatusCooper, 1917) is redescribed from type and voucher specimens, and new material from the type host, the walleye, Sander vitreus (Mitchill, 1818) (Perciformes: Percidae), in Manitoba and Ontario (where the type locality is located) (Canada) and in New York state and Wisconsin. Bothriocestus cuspidatus of S. vitreus is characterized primarily by the possession of a narrow, long strobila (total length up to 18 cm) composed of distinctly craspedote, trapezoidal proglottids, with primary, secondary, and tertiary proglottids differing in size, and by an arrow-shaped (=cuspidatus) scolex that is distinctly broader than the first proglottids, widest near the base in lateral view and gradually becoming broader toward the anterior end in dorsoventral view. A "dwarf" form of B. cuspidatus (total length of 9-27 mm) from Johnny darter, Etheostoma nigrum Rafinesque, 1820, and tessellated darter, Etheostoma olmstedi Storer, 1842 (both Percidae: Etheostominae), is also characterized morphologically in the present paper.

Biology Department and Biological Field Station State University of New York College at Oneonta Ravine Parkway Oneonta New York 13820

Division of Natural Sciences St Norbert College 100 Grant Street De Pere Wisconsin 54115

Institute of Parasitology Biology Centre of the Czech Academy of Sciences Branišovská 31 370 05 České Budějovice Czech Republic

Zobrazit více v PubMed

Amin, O. M. Cestoda from lake fishes in Wisconsin: The ecology and interspecific relationships of bothriocephalid cestodes in walleye, Stizostedion vitreum. Journal of the Helminthological Society of Washington. 1992;59:76–82.

Brabec, J., Waeschenbach, A., Scholz, T., Littlewood, D. T. J. and Kuchta. R. Molecular phylogeny of the Bothriocephalidea (Cestoda): Molecular data challenge morphological classification. International Journal for Parasitology. 2015;45:761–771. PubMed

Chervy, L. Unified terminology for cestode microtriches: A proposal from the international workshops on cestode systematics in 2002–2008. Folia Parasitologica. 2009;56:199–230. PubMed

Choudhury, A. and Scholz. T. Ex uno plures: Morphotype and lineage diversity of Bothriocephalus (Cestoda: Bothriocephalidea) in North American freshwater fishes. Journal of Parasitology. 2020;106:589–602. PubMed

Choudhury, A., Scholz, T. and Beuchel. J. P.A new species of Bothriocephalus (Cestoda: Bothriocephalidae) from Lepomis spp. (Actinopterygii: Centrarchidae) in North America. Journal of Parasitology 108: 343–352. 2022. PubMed

Cooper, A. R. A morphological study of bothriocephalid cestodes from fishes. Journal of Parasitology. 1917;4:33–39.

Cooper, A. R. North American pseudophyllidean cestodes from fishes. Illinois Biological Monographs. 1919;4:228–542.

Etnier, D. A. and Starnes. W. C. The Fishes of Tennessee. The University of Tennessee Press; Knoxville, Tennessee: 1993. 689. p.

Frimodt, C.Multilingual Illustrated Guide to the World's Commercial Coldwater Fish. Fishing News Books, Osney Mead, Oxford, England, 1995. 215. p.

Froese, R. and Pauly D.FishBase. 2022. (eds.) Available at: http://www.fishbase.org. Accessed 22 September 2022.

Hoffman, G. L. Parasites of North American Freshwater Fishes,, 2nd ed. Comstock Publishing Associates; Ithaca, New York: 1999. 539. Cornell University Press, p.

Kuchta, R. and Scholz. T. Diversity and distribution of fish tapeworms of the order “Bothriocephalidea” (Eucestoda) Parassitologia. 2007;49:129–146. PubMed

Kuchta, R. and Scholz. T.Caira J. N., and Jensen K., , editors. Bothriocephalidea. Tapeworms from Vertebrate Bowels of the Earth 2008–2016. Special publication No. 25, Natural History Museum, University of Kansas, Allen Press, Lawrence, Kansas, 2017. pp. 29–45. In. (eds.) p.

Kuchta, R., Scholz, T. and Bray. R. A. Revision of the order Bothriocephalidea Kuchta, Scholz, Brabec & Bray, 2008 (Eucestoda) with amended generic diagnoses and keys to families and genera. Systematic Parasitology. 2008;71:81–136. PubMed

Margolis, L. and Arthur. J. R. Synopsis of the parasites of fishes of Canada. Bulletin of the Fisheries Research Board of Canada. 1979;199:1–269.

McDonald, T. E. and Margolis. L. Synopsis of the parasites of fishes of Canada. Supplement (1978–1993) Canadian Special Publications on Fisheries and Aquatic Sciences. 1995;122:1–265.

Molnár, K. Bothriocephalus phoxini sp. n. (Cestoda, Pseudophyllidea) from Phoxinus phoxinus L. Folia Parasitologica. 1968;14:83–86.

Odening, K. Conception and terminology of hosts in parasitology. Advances in Parasitology. 1976;14:1–93. PubMed

Page, L. M. and Burr, B. M. A Field Guide to Freshwater Fishes of North America North of Mexico. Houghton Mifflin Harcourt Company; Boston, Massachusetts: 1991. 432. p.

Protasova, E. N.Cestodes of fish—Bothriocephalata. Principles of Cestodology, Vol. VIII. Akademia Nauk SSSR, Moscow, Russia, 1977. 298. In. p. (In Russian)

Scholz, T. A revision of the species of Bothriocephalus Rudolphi, 1808 (Cestoda: Pseudophyllidea) parasitic in American freshwater fishes. Systematic Parasitology. 1997;32:85–107. a.

Scholz, T. Life-cycle of Bothriocephalus claviceps, a specific parasite of eels. Journal of Helminthology. 1997;71:241–252. b. PubMed

Scholz, T. and Choudhury. A. Parasites of freshwater fishes in North America: Why so neglected? Journal of Parasitology. 2014;100:26–45. PubMed

Scott, W. B. and Crossman. E. J. Freshwater fishes of Canada. Bulletin of the Fisheries Research Board of Canada. 1973;184:1–966.

Wardle, R. A. and McLeod. J. A. The Zoology of Tapeworms. University of Minnesota Press; Minneapolis, Minnesota: 1952. 780. p.