A new genus of proteocephalid tapeworm (Cestoda) from the marbled swamp eel Synbranchus marmoratus Bloch (Synbranchiformes: Synbranchidae) in the River Parana basin, Argentina

0478896 - BC 2018 RIV CZ eng J - Journal Article
Arredondo, N.J. - Alves, Philippe Vieira - Gil de Pertierra, A.A.
A new genus of proteocephalid tapeworm (Cestoda) from the marbled swamp eel Synbranchus marmoratus Bloch (Synbranchiformes: Synbranchidae) in the River Parana basin, Argentina.
Folia Parasitologica. Roč. 64, MAY 5 (2017), č. článku 015. ISSN 0015-5683. E-ISSN 1803-6465
R&D Projects: GA ČR(CZ) GBP505/12/G112
Institutional support: RVO:60077344
Keywords : Proteocephalidae * Monticelliinae * taxonomy * morphology * phylogenetic analysis * freshwater * Neotropical Region
OECD category: Veterinary science
Impact factor: 1.505, year: 2017

Synbranchiella gen. n. is proposed to accommodate Synbranchiella mabelae sp. n. (Proteocephalidae: Monticelliinae) from the intestine of the marbled swamp eel Synbranchus marmoratus Bloch, in the River Colastine, a tributary of the middle River Parana in Argentina. The new genus is placed in the Monticelliinae because of the cortical position of the genital organs. It differs from all known monticelliine genera by the following combination of characters: (i) scolex robust, with a conical apex, without metascolex, (ii) biloculate suckers with a conspicuous septum separating unequally-sized loculi and a robust non-adherent area, lacking free posterior margin, (iii) vitelline follicles in two narrow lateral bands, extended throughout the nearly entire proglottid length, (iv) vagina always anterior to the cirrus-sac, with an inconspicuous vaginal sphincter, (v) a genital pore pre-equatorial. Scanning electron microscopy revealed three types of microtriches on the tegument surface: acicular and capiliform filitriches and gladiate spinitriches. A phylogenetic analysis of the large subunit nuclear ribosomal RNA gene (lsrDNA, D1-D3 domains) confirms that S. mabelae represents an independent lineage within a large clade comprised mainly from Neotropical taxa parasitising catfishes. This is the second proteocephalidean cestode described from a Neotropical synbranchiform fish host.
Permanent Link: http://hdl.handle.net/11104/0274949