Variation in eggshell characteristics and in intrauterine egg retention between two oviparous clades of the lizard lacerta vivipara: insight into the oviparity-viviparity continuum in squamates

The concept of the oviparity–viviparity continuum refers to the wide range in the length of intrauterine egg retention and, hence, in the stage of embryonic development at oviposition existing in squamates. The evolutionary process underlying this continuum may involve not only a lengthening of egg...

Ausführliche Beschreibung