Fig. 1
From: Tooth and scale morphogenesis in shark: an alternative process to the mammalian enamel knot system
External morphology of adult and developing teeth and scales in Scyliorhinus canicula. a adult male jaw, frontal view with insets on teeth from the lower jaw (A1, tooth from the lateral side, A2, para-symphyseal tooth, A3, symphyseal tooth). b dorsal view of an alizarin red stained lower jaw of a 7.5 cm long embryo with inset on the tricuspid mineralized first generation teeth. c SEM, labial view of a bilaterally symetric tooth with five cusps from an adult female, d SEM, lateral view of a similar tooth. e and f: schematics of teeth in c and d with crown orientation: ap: apical; ba: basal; lb: labial; lg, lingual. g: SEM, tooth of an adult female with altered symmetry and small central cusp. h: SEM, lateral view of the tip of the tail of a 4.8 cm long embryo showing the caudal scales. i: SEM, lateral view of one erupted caudal scale. j: ventral view of the tail of a 5 cm long embryo after staining with alizarin red showing developing caudal scales. Scale bars: A1, A3, B, H: 500 μm; A2: 700 μm; C, D, G, J: 250 μm; I: 50 μm