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top of head convex
no fatty eyelidD2 10mouth under snoutA II, 11soft D & A - covered with scales -
top of head convex
no fatty eyelidD2 9mouth opens at front
teeth not on lips, fixed on jawsA II, 10soft D & A - scales on bases -
top head ~flat
with fatty eyelidD2 7-8soft D & A densely scaledmouth opens at front
teeth tiny, on lipsA III, 7-9