| 41. | The skin is entirely devoid of dermal denticles, and may be creased in areas.
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| 42. | The dermal denticles are flat and blocky, not elevated on stalks or bearing marginal teeth.
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| 43. | The dermal denticles are large and widely spaced, giving the skin a very rough texture.
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| 44. | The skin is thick and covered by well-calcified, leaf-shaped dermal denticles.
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| 45. | The skin is very rough, due to a covering of large, upright dermal denticles.
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| 46. | On the dorsal edge of its caudal fin is a prominent crest of enlarged dermal denticles.
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| 47. | The skin completely lacks dermal denticles.
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| 48. | The skin entirely lacks dermal denticles.
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| 49. | The dermal denticles are small and flat, with a single horizontal ridge ending in a point.
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| 50. | The dermal denticles are small and overlapping, each with three horizontal ridges leading to marginal teeth.
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