EUROPEAN JOURNAL OF ENTOMOLOGYENTOMOLOGY ISSN (online): 1802-8829 Eur. J. Entomol. 115: 339–353, 2018 http://www.eje.cz doi: 10.14411/eje.2018.034 ORIGINAL ARTICLE Variation in the morphology of the wings of the endangered grass-feeding butterfl y Coenonympha oedippus (Lepidoptera: Nymphalidae) in response to contrasting habitats JURE JUGOVIC 1, SARA ZUPAN 1, ELENA BUŽAN 1 and TATJANA ČELIK 2, * 1 Department of Biodiversity, Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, 6000 Koper, Slovenia; e-mail:
[email protected],
[email protected],
[email protected] 2 Research Centre of the Slovenian Academy of Sciences and Arts, Novi trg 2, 1000 Ljubljana, Slovenia; e-mail:
[email protected] Key words. Lepidoptera, Nymphalidae, butterfl y, Coenonympha oedippus, False Ringlet, wing, adaptation, classical morphometrics, geometric morphometrics, environmental heterogeneity Abstract. At the southern limit of its range the endangered butterfl y Coenonympha oedippus inhabits grasslands (wet, dry) that differ signifi cantly in the abundance of its larval hostplants (wet > dry) and mean annual air temperature (wet < dry). We deter- mined the difference in the wing morphology of individuals in the two contrasting habitats to test whether and how traits associated with wing size, shape and eye like spots vary in the sexes and two ecotypes. We show that sexual dimorphism follows the same (wing size and shape, number of eyespots on forewing) or different (relative area of eyespots on hindwings) patterns in the two contrasting habitats. Irrespective of ecotype, females had larger, longer and narrower wings, and more forewing eyespots than males. Sexual dimorphism in the relative area of eyespots on hindwing was female-biased in the wet, but male-biased in the dry ecotype.