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Ripart's Anomalous Blue Polyommatus ripartii (Freyer, 1830) is one of the most seriously endangered butterfly species in central Europe, a small, relict population of which has survived in two localities in Poland. This isolated population is undoubtedly the last and northernmost remnant of a once much wider range in central Europe. P. ripartii is associated with highly xerophilous vegetation on gypsum and calcareous soils. Only active conservation measures can ensure its survival. For these to be successful, however, precise information on the butterfly's biology, behavior and also its morphology is crucial. The first to do so, this article describes the butterfly's egg-laying preferences, and specifies the numbers of eggs on a single shoot and their placement on it. A unique behavioral trait of the female--the secretion of oviposition-deterring pheromones--is reported. The preferred plant associations and nectar sources have been investigated, and information on overnight roosts is given. In addition, an exhaustive description of the morphologies of the egg, final instar and pupa, as well as new details of adult behavior are provided. The main conclusion of the this study is that the existence of a stable population in the Nida Region is determined by the presence of large patches of sainfoin, which is both the larval host plant and a source of nectar for the imago. Moreover, stress is laid on the importance of Inula ensifolia L. as the secondary nectaring plant, which may facilitate dispersion among patches of suitable habitat. Finally, the study shows that searching for the easily detected eggs may be the best method for proving the existence of the species in a given locality.

journal of insect science

Polyommatus ripartii: The Biological Basis for the Conservation and the Morphology of the Developmental Stages of a Critically Endangered, Relict Population in Central Europe