A comparative study of the urinogenital systems of an oviparous and two ovoviviparous species of the lizard genus sceloporus

In the comparative study of the urinogenital systems of the American lizards by Brooks (1906), all the species studied by him were oviparous. One of the genera, Sceloporus, is now known to contain ovoviviparous forms as well. The presence of both oviparity and ovoviviparity in the same genus suggested a comparison of the urinogenital systems in the two groups. Available for this study was a small series of S. microlepidotus disparilis Stejnegerf (13 females and 5 males), S. poinsetti Baird and Girard (3 females and 2 males), and S. olivaceus Smith (6 females and 4 males). The first two species are ovoviviparous (Mulaik 1936; Smith, 1936, p. 612) and the third, under which Brooks' S. floridanus was synonomized (Smith, 1939, p. I l l ) , is an oviparous form.