Morphometric variation in leg segments length in the family Dolichopodidae (Diptera)
Abstract
Interspecific variation of legs morphometric characters were investigated on 2885 exemplar species of the family Dolichopodidae of the 65 species belonging to 22 genera. Nine morphometric characters of the leg were measured including lengths of femora, tibia and first segment of tarsi and their ratio were obtained. The results of analysis of variance showed significant differences between the genera, but not between the subfamilies. Most of the studied characters showed weak phylogenetic signal. Significant phylogenetic signal was found in only one of the studied – the ratio of length of middle femora and tibia. Principal component analysis revealed the set of characters most typical for the species of the family, also was demonstrated leg morphometry diversity through two general trends: elongation of the first segment of middle and hind legs and variation in the ratio of fore, middle and hind femora. Cluster analysis allowed us to found three morphologically distinguishable species groups that also differed in terms of their microhabitat: Medetera-like species (lengths of fore, middle and hind femora are nearly equal), Hydrophorus-like species (middle and hind femora and tibia are significantly extended regarding the fore femora and tibia), Sciapus-like species (all first segments of tarsi are significantly extended). Each of the identified groups includes species belonging to different subfamilies. Therefore, the similarity in leg morphometry features in dolichopodids are supported to be related to convergent evolution, and not the presence of a common ancestor with a similar morphology.
Keywords
Diptera,
Dolichopodidae,
Hydrophorus,
Medetera,
Sciapus,
morphometry,
leg,
phylogeny,
phylogenetic signal
About the Authors
M. A. Chursina
Voronezh State Pedagogical University
Russian Federation
Russian Federation
Department of Plant and Animal Biology, Natural-Geographical Department
ul. Lenin, 86, 394043, Voronezh
O. P. Negrobov
Voronezh State University
Russian Federation
Russian Federation
Department of Ecology and Systematics of Invertebrate Animals, Medical-Biological Faculty
Universitetskaya pl., 2, 394018, Voronezh
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Review
For citations:
Chursina M.A., Negrobov O.P. Morphometric variation in leg segments length in the family Dolichopodidae (Diptera). Vestnik Moskovskogo universiteta. Seriya 16. Biologiya. 2020;75(3):138-144. (In Russ.) https://doi.org/595.772
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