Section 31
Chapter 30,788

Cytotaxonomy of Simulium soderense sp nov and a redescription of the Kulfo form Dunbar, 1969 of Simulium damnosum sl Diptera Simuliidae as Simulium kulfoense sp nov in Ethiopia

Hadis, M.; Wilson, M., D.; Cobblah, M., A.; Boakye, D., A.

International Journal of Tropical Insect Science 28(1): 3-11


ISSN/ISBN: 1742-7584
DOI: 10.1017/s1742758408901351
Accession: 030787423

The exact taxonomic identity of members of the Simulium damnosum Theobald complex in Ethiopia was not known until recently. A cytotaxonomic analysis of larval chromosomes from the Kulfo River area in southern Ethiopia, from where the 'Kulfo' form was reported, and from the Awash River at Sodere in central Ethiopia has revealed the existence of two newly recognized species, namely Simulium kulfoense and Simulium soderense. Although three fixed and 11 floating inversions in the chromosomes of the 'Kulfo' form were described in an idiogram, in the present study four fixed and 17 floating inversions were observed, out of which only seven floating inversions were the same as Dunbar's, indicating that the remaining 10 inversions were either missed or misinterpreted. Though both species share many inversions, S. kulfoense sp. nov. has a diagnostic inversion on chromosome II, IIL-E6, with no sex-linked chromosomal arrangement, while S. soderense sp. nov. has a sex-linked inversion, ITS-3, which warrants it as a distinct species. Both of these new species also share many inversions with the recently described new species from southwestern Ethiopia, Simulium kaffaense, including the fixed inversions IIL-E1 and E3. Since both the study sites are known to be free of onchocerciasis, and the flies are not anthropophilic, both the species are not presumed to be vectors of human onchocerciasis. The presence of IS-1 and a complex inversion possibly involving IL-3 strongly indicates that the two species belong to the 'Nile' phylogenetic group of S. damnosum s.l.

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