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Only one species? Cryptic diversity and spatial distribution of <em>Culicoides obsoletus sensu lato</em> (Diptera: Ceratopogonidae) in Europe

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Academic year: 2021

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HAL Id: hal-02789486

https://hal.inrae.fr/hal-02789486

Submitted on 5 Jun 2020

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Only one species? Cryptic diversity and spatial

distribution of Culicoides obsoletus sensu lato (Diptera:

Ceratopogonidae) in Europe

Laura Tabourin, Laetitia Gardes, Ignace Rakotoarivony, Bruno Mathieu,

Thomas Balenghien, Thierry Baldet, Claire Garros, Karine Huber, .

Vectornet Partners

To cite this version:

Laura Tabourin, Laetitia Gardes, Ignace Rakotoarivony, Bruno Mathieu, Thomas Balenghien, et al.. Only one species? Cryptic diversity and spatial distribution of Culicoides obsoletus sensu lato (Diptera: Ceratopogonidae) in Europe. 7. International SOVE Congress, Oct 2017, Palma of Mallorca, Balearic Islands, Spain. 2017. �hal-02789486�

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Only one species? Cryptic diversity and spatial distribution of

Culicoides obsoletus sensu lato (Diptera: Ceratopogonidae) in

Europe

Laura Tabourin1, Laetitia Gardès1, Ignace Rakotoarivony1, Bruno Mathieu2, Thomas

Balenghien1, Thierry Baldet3, Claire Garros1, Karine Huber4 and VectorNET partners1 Cirad, UMR ASTRE, Montpellier, France1; IPPTS, Strasbourg, France2; IAV, Rabat, Morocco3; Cirad, UMR ASTRE, Ste Clotilde, La Reunion4.

garros@cirad.fr

Vector competence studies and virus detection in Culicoides populations have highlighted the role of Culicoides obsoletus as main vector species of bluetongue and Schmallenberg viruses in the Palearctic region. Culicoides obsoletus is a well-described species, recorded in sympatry with an undistinguishable species, C. scoticus, and other morphologically closely related species, C. chiopterus, C. dewulfi, and C. montanus. Recently, several authors have reported the existence of cryptic diversity within the usually called C. obsoletus. This raises the question of the taxonomic validity of this newly reported diversity, its spatial distribution and eventually the specificity of the molecular diagnostic tools. This is of main importance to assess the epidemiological role of all the valid taxa. In this study, we molecularly identified 1300 C. obsoletus s.l. specimens from 11 countries in Europe. The phylogenetic reconstruction confirmed the existence of at least three undescribed species within C. obsoletus s.s. (C. obsoletus #O2, C. obsoletus #dark and a yet undetermined species) and reported the existence of two clades within C. scoticus. A distribution map of these species gives a first insight of the European spatial distribution of the different species within C. obsoletus s.l.

This work shows the importance of taxonomic reassessment of vector species and the constant evaluation of diagnostic molecular tools at regional level.

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