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Molecular evidence of three closely related species of Biacetabulum Hunter, 1927 (Cestoda: Caryophyllidea): a case of recent speciation in different fish hosts (Catostomidae)?

Published online by Cambridge University Press:  12 May 2021

Dalibor Uhrovič Open the ORCID record for Dalibor Uhrovič [Opens in a new window] ,
Mikuláš Oros Open the ORCID record for Mikuláš Oros [Opens in a new window] ,
Olena Kudlai Open the ORCID record for Olena Kudlai [Opens in a new window] ,
Anindo Choudhury Open the ORCID record for Anindo Choudhury [Opens in a new window]  and
Tomáš Scholz Open the ORCID record for Tomáš Scholz [Opens in a new window]
Dalibor Uhrovič
Affiliation:
Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01Košice, Slovak Republic and University of Veterinary Medicine and Pharmacy, Košice, Slovak Republic
Mikuláš Oros
Affiliation:
Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01Košice, Slovak Republic and University of Veterinary Medicine and Pharmacy, Košice, Slovak Republic
Olena Kudlai
Affiliation:
Institute of Parasitology, Biology Centre of Academy of Sciences of Czech Republic and Faculty of Science, University of South Bohemia, Branišovská 31, 370 05České Budějovice, Czech Republic Laboratory of Parasitology, Nature Research Centre, Akademijos 2, LT-08412Vilnius, Lithuania;
Anindo Choudhury
Affiliation:
Division of Natural Sciences, St. Norbert College, De Pere, Wisconsin, USA
Tomáš Scholz*
Affiliation:
Institute of Parasitology, Biology Centre of Academy of Sciences of Czech Republic and Faculty of Science, University of South Bohemia, Branišovská 31, 370 05České Budějovice, Czech Republic
*
Author for correspondence: Tomáš Scholz, E-mail: tscholz@paru.cas.cz
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Abstract

Monozoic tapeworms (Caryophyllidea) are dominant components of parasite communities of suckers (Catostomidae) in North America, with Biacetabulum Hunter, 1927 representing one of the more species-rich genera. Molecular (28S rDNA) and morphological (including scanning electron microscopy and histology) evaluation of newly collected tapeworms from different fish hosts revealed the existence of four similar (and three closely related) species of Biacetabulum. These four species differ from their congeners by having a long body (up to 48 mm long) with a very long, slender neck (its length represents ≥30% of total body length), a large, globular scolex with a prominent central acetabulum-like loculus on the dorsal and ventral sides, two pairs of shallow lateral loculi and a distinct, slightly convex apical disc, and a cirrus-sac that is situated between the anterior arms of the ovarian wings. Taken together, the morphological and molecular data and the host associations of these species provide evidence of their host specificity. Biacetabulum isaureae n. sp. occurs in notch clip redhorse, Moxostoma collapsum, in South Carolina (USA), B. longicollum n. sp. in silver redhorse, Moxostoma anisurum (type host), and golden redhorse, M. erythrurum, in Manitoba (Canada) and West Virginia (USA), B. overstreeti n. sp. in a spotted sucker, Minytrema melanops, in Mississippi, and B. hypentelii n. sp. in northern hogsucker, Hypentelium nigricans, in Tennessee (USA). The new species differ from each other in the number of postovarian vitelline follicles, the posterior extent of preovarian vitelline follicles and relative size of the cirrus sac.

Keywords

28S DNAcomparative morphologyEucestodafishNearctic regionSEMspecies complexsuckers
Type
Research Article
Information
Parasitology , Volume 148 , Issue 9 , August 2021 , pp. 1040 - 1056
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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