The upper (suprarostral) and lower (infrarostral) supportive jaw
cartilages have pigmented and keratinized jaw sheaths. The
relative amount of dark keratinization (width in longitudinal
dimension) of a sheath sometimes is useful for distinguishing
among tadpoles. Narrow Sheaths-dark for less than half the width
Medium Sheaths-dark for about half the width Wide Sheaths-dark
for nearly the entire width Other jaw sheath characteristics are
sometimes useful to distinguish among species. Tutorial
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Musculature|Spiracle Vent|Oral Disc Morphology|Labial Tooth Row
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