Figure 1 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)

Figure 1. First-generation dentition in Astyanax mexicanus. Asterisks indicate positions of teeth. A, 5 days postfertilization (dpf) (4.5 mm total length (TL, measured to the nearest 0.1 mm with calipers prior to fixation)) showing one tooth on each jaw quadrant, left side. M, Meckel's cartilage; P, premaxilla. B, 10 dpf (5.2 mm TL) showing three teeth on the right premaxilla; one tooth is also visible on the lower jaw. C, 28 dpf (7.8 mm TL) showing five attached teeth, and one unattached, on the right premaxilla. D, 40 dpf (9.2 mm TL) showing signs of resorption (left arrow) and replacement by a second generation of unicuspid teeth (right arrow) on the left premaxilla. Scale bars = 100 µm.