Fig. 9
From: Developmental changes and novelties in ceratophryid frogs
Premaxillary and maxillary teeth in ceratophryids. Whole mounts stained for cartilage and bone. a Ceratophrys cranwelli, adult female. b, e Chacophrys pierottii, adult male. c, f Lepidobatrachus laevis, adult male. d, g L. llanensis, recently metamorphosed individual. h, i Dorsal view of the snout of C. pierottii at larval Gosner Stages 39 and 41. Germs of maxillary and premaxillary teeth appear already calcified before differentiation the maxillary bone. j L. laevis tadpole before the beginning the metamorphosis with teeth germs and the incipient premaxillary and maxillary bones. In ceratophryids, the early differentiations of teeth within the larval dermis illustrate the capability of the integument to give rise to ectopic ossifications before metamorphosis. mx maxillary, mxt maxillary teeth, pmx premaxillary, pmxt premaxillary teeth. Scale bars in a–d, e–g equals 1 mm, h–j equal 2 mm