Asymmetry in genitalia does not increase the rate of their evolution.
Left-right asymmetry is a frequently encountered phenomenon in the copulation organs of insects. While various causes have been proposed for genital asymmetry, we raise the question of whether asymmetry might facilitate, or even accelerate, morphological divergence of genitalia between species. We tested this hypothesis in the scarab chafer genus Schizonycha, which comprises species with symmetric as well as asymmetric male genitalia. Morphometric analyses were conducted in the context of their phylogeny, inferred from mitochondrial and nuclear ribosomal DNA sequence data (cox1, rrnL, and 28S) for a sample of 99 South African specimens, including 34 species and 5 outgroup taxa. Trees were reconstructed with maximum likelihood and Bayesian analysis. The extent of asymmetry and the variation of male copulation organs were analyzed with Generalized Procrustes analysis (GPA), by quantifying shape divergence of the parameres. We found a continuous transition in the degree of asymmetry among the investigated species. Ancestral state reconstruction revealed multiple origins and a high degree of evolutionary plasticity of paramere asymmetry in Schizonycha. However, no significant correlation between evolutionary rates of paramere shape divergence and the degree of paramere asymmetry was found, and so we conclude that asymmetric genitalia in Schizonycha do not increase the rate of genital shape divergence.
Zoologisches Forschungsmuseum Alexander Koenig Bonn, Adenauerallee 160, 53113 Bonn, Germany.
J
J
Eberle
Zoologisches Forschungsmuseum Alexander Koenig Bonn, Adenauerallee 160, 53113 Bonn, Germany.
W
W
Walbaum
Department of Paleobiology, National Museum of Natural History, The Smithsonian Institution, P.O. Box 37012, Washington, DC 20013-7012, USA.
R C M
RC
Warnock
Department of Entomology, Natural History Museum, London SW7 5BD, United Kingdom; Zoologisches Forschungsmuseum Alexander Koenig Bonn, Adenauerallee 160, 53113 Bonn, Germany.
S
S
Fabrizi
Department of Entomology, Natural History Museum, London SW7 5BD, United Kingdom; Zoologisches Forschungsmuseum Alexander Koenig Bonn, Adenauerallee 160, 53113 Bonn, Germany. Electronic address: ahrens.dirk_col@gmx.de.
D
D
Ahrens
D000818:Animals; D001499:Bayes Theorem; D001517:Coleoptera / Q000033:anatomy & histology* / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D049810:Genetic Speciation; D005837:Genitalia, Male / Q000033:anatomy & histology; D008297:Male; D010802:Phylogeny
D004275:DNA, Ribosomal
Coleoptera; Directional asymmetry; Male genitalia; Morphological rates; Scarabaeidae; Schizonycha