Confirmation of the species status of the blackfly Simulium galeratum in Britain using molecular taxonomy


Day, JC; Goodall, TI; Post, RJ; (2008) Confirmation of the species status of the blackfly Simulium galeratum in Britain using molecular taxonomy. Medical and veterinary entomology, 22 (1). pp. 55-61. ISSN 0269-283X DOI: https://doi.org/10.1111/j.1365-2915.2008.00719.x

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Abstract

Since 1920 Simulium reptans (Linnaeus) (Diptera: Simuliidae) has been reported as exhibiting two different larval morphotypes, a typical S. reptans and an atypical S. reptans var. galeratum, which differ in the markings of the larval head capsule. Inconsistent variation in adults and no apparent variation in the pupae have led taxonomists to conclude that these types in Britain are a single species. We investigated populations in Britain where either the typical form or var. galeratum is found, and one population where the two exist sympatrically. A phylogenetic study based upon a region of the mitochondrial cytochrome c oxidase 1 gene (DNA barcoding) produced a tree that delineated the morphotypes into two distinct monophyletic clades. The average Kimura-2-parameter distances within each clade (i.e. within each morphotype) were very low (0.67% and 0.78%), with the distances between morphotypes being 9-10-fold greater (mean 7.06%). This is concordant with differences within and between species in other taxa; based upon the strict correlation between the molecular variation and the morphotypes, we propose the re-instatement of S. galeratum to species status.

Item Type: Article
Keywords: Simuliidae, Simulium galeratum, Simulium reptans, cytochrome oxidase 1, DNA barcoding, molecular taxonomy, DAMNOSUM COMPLEX, CENTRAL-EUROPE, DIPTERA, DNA, IDENTIFICATION, ONCHOCERCIASIS, MARKER
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Disease Control
PubMed ID: 18380654
Web of Science ID: 254563900007
URI: http://researchonline.lshtm.ac.uk/id/eprint/7632

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