Gonydactylus paradoxus sp.nov from a small off-shore island in South Vietnam distinctly differs from all other known species of the genus Gonydactylus in the absence of preanal and femoral pores in males and females.The occurrence in a new insular species of a feature so unusual for the genus Gonydactylus may be an external manifestation of founder effect sensu E. Mayr ( 1942).
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Nikolai N. Szczerbak (1997) studied this question.
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