Redescription, systematic status and molecular characterisation of Multicaecum heterotis Petter, Vassiliades et Marchand, 1979 (Nematoda: Heterocheilidae), an intestinal parasite of Heterotis niloticus (Osteichthyes: Arapaimidae) in Africa
2010
Masova, S.,Masarykova Univ., Brno (Czech Republic). Ustav Botaniky a Zoologie | Moravec, F.,Akademie Ved, Ceske Budejovice (Czech Republic). Parazitologicky Ustav | Barus, V.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Zoologie a Rybarstvi | Seifertova, M.,Masarykova Univ., Brno (Czech Republic). Ustav Botaniky a Zoologie
Ascaridoid nematodes referable to Brevimulticaecum heterotis were recorded from the intestine of the African bonytongue, Heterotis niloticus, from the Mare Simenti in the Niokolo Koba National Park, East Senegal and from Kosti, Sudan. Their examination using light microscopy and for the first time both environmental scanning electron microscopy and scanning electron microscopy revealed some previously unreported morphological features and made possible a detailed redescription of this species. The most important finding is the presence of dentigerous ridges on the inner edges of the lips, which confirms the attribution of this species to Multicaecum where it had been originally placed, and not to Brevimulticaecum where it was subsequently transferred. A key to Brevimulticaecum and Multicaecum species is provided. Multicaecum heterotis is the first species of the genus to be sequenced. Partial sequences of the small ribosomal subunit (18S) and internal transcribed spacer 2 region (ITS2) of nuclear ribosomal DNA (rDNA) have been analysed and compared with other nematode species.
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