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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Sandonella sandoni (Lynsdale, 1960), an enigmatic and morphologically unique cestode parasitic in the osteoglossiform fish Heterotis niloticus in Africa
Journal of Parasitology, Volume 94, No. 1, Year 2008
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Description
Sandonella sandoni (Lynsdale, 1960) is the type and only species of the Sandonellinae, a cestode subfamily of unclear phylogenetic position. It is redescribed here on the basis of a re-examination of its syntypes, voucher specimens from museum collections, and freshly collected material from the intestine of Heterotis niloticus (Osteoglossiformes: Arapaimidae) from Benin, Nigeria, Senegal, and the Sudan. The species possesses several unique morphological characters, such as (1) a vitellarium formed by 2 compact, but deeply lobulated, postovarian masses near the posterior margin of proglottids; (2) a scolex with a highly modified apical structure formed by 4 muscular retractile lappets; (3) a well-developed circular musculature, which is external to the inner longitudinal muscles; (4) a dilated, vesicle-like proximal part of the external sperm duct; (5) the unique morphology of the uterus and its development, which represents an intermediate form between the 2 basic types recognized in the Proteocephalidea; (6) the growth of eggs during their development within the uterus; and (7) the complex proglottization with intermingled smaller and larger (wider) proglottids. The morphology of S. sandoni, including the form and distribution of microtriches, was studied by scanning electron microscopy for the first time, and the lectotype and paralectotypes of S. sandoni are designated. Sequences of the 28S rRNA gene of 4 specimens (2 from the Sudan and 2 from Senegal) were identical, which confirms conspecificity of geographically distant samples. Sandonella sandoni sequences have also shown that it actually belongs among the Proteocephalidea, being a sister taxon of a relatively derived clade of Palaearctic proteocephalideans, containing Glanitaenia osculata and Paraproteocephalus parasiluri from catfish and Palaearctic species of the Proteocephalus aggregate. © American Society of Parasitologists 2008.
Authors & Co-Authors
de Chambrier, Alain
Switzerland, Geneva
Natural History Museum of Geneva
Mariaux, Jean
Switzerland, Geneva
Natural History Museum of Geneva
Sène, Aminata
Switzerland, Geneva
Natural History Museum of Geneva
Senegal, Dakar
Université Cheikh A. Diop
Mahmoud, Zuheir Nor Eldaym
Switzerland, Geneva
Natural History Museum of Geneva
Sudan, Khartoum
Khartoum University
Scholz, Tomáš Š.
Switzerland, Geneva
Natural History Museum of Geneva
Czech Republic, Ceske Budejovice
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic
Statistics
Citations: 25
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1645/GE-1275.1
ISSN:
00223395
Research Areas
Genetics And Genomics
Study Design
Cohort Study
Study Locations
Benin
Nigeria
Senegal
Sudan