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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Morphological reinforcement, ancient introgressive hybridization and species delimitation in African stem-borer species of the genus Sesamia Guenée (Lepidoptera: Noctuidae)
Systematic Entomology, Volume 36, No. 3, Year 2011
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Description
Species delimitation, an issue central to systematics and biodiversity studies, is addressed in the epunctifera group of the stem borer genus Sesamia Guenée (Lepidoptera: Noctuidae). This group is composed of four sub-Saharan species: Sesamia poephaga Tams & Bowden; Sesamia epunctifera Hampson; Sesamia penniseti Tams & Bowden; and Sesamia poebora Tams & Bowden, the taxonomic status of which was unclear. The first species was considered a possible synonym of the second, and the third species was considered a possible synonym of the fourth. An analysis combining morphological, ecological and molecular data enables us to conclude that S. epunctifera and S. poephaga are different species, and that S. poebora is a synonym of S. penniseti. Two new species were discovered: Sesamia firmatasp.n. and Sesamia veronicasp.n.Sesamia firmatasp.n. has atypical genitalic morphology, suggesting a strong selection resulting in a reinforcement of pre-zygotic isolation. Some specimens previously identified as S. penniseti on the basis of morphology are sisters to S. epunctifera on the mitochondrial tree, and are connected to S. penniseti on the nuclear tree. The mitochondrial distance from S. penniseti and S. epunctifera is 7.6% and 3.9%, respectively, suggesting an ancient mitochondrial introgression from S. epunctifera into S. penniseti. The possible causes of the reinforcement and introgressive hybridization are discussed. This case of mitochondrial introgression, uncommon in Lepidoptera, in which females are the heterogametic sex, may be an exception to Haldane's rule. The hybrid is assigned the rank of species and named Sesamia pennipuncta sp.n. © 2011 The Authors. Systematic Entomology © 2011 The Royal Entomological Society.
Authors & Co-Authors
Moyal, Pascal
France, Paris
Cnrs Centre National de la Recherche Scientifique
Le Rû, Bruno Pierre
Kenya, Nairobi
International Centre of Insect Physiology and Ecology Nairobi
Van den Berg, Johnnie
South Africa, Potchefstroom
North-west University
Ratnadass, Alain
France, Paris
Cirad
Cugala, Domingos R.
Mozambique, Maputo
Universidade Eduardo Mondlane
Matama-Kauma, Teddy
Uganda, Kampala
Namulonge Agricultural and Animal Production Research Institute Uganda
Pallangyo, Beatrice
Tanzania
Biocontrol Programme
Conlong, Desmond E.
South Africa, Mount Edgecombe
South African Sugarcane Research Institute
South Africa, Durban
University of Kwazulu-natal
Defabachew, Belay
Ethiopia
Ethiopian Agricultural Research Centre
Statistics
Citations: 16
Authors: 9
Affiliations: 10
Identifiers
Doi:
10.1111/j.1365-3113.2011.00570.x
e-ISSN:
13653113
Research Areas
Cancer
Genetics And Genomics
Participants Gender
Female