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head & body ovalD: 1st spine small, projects forwardsteeth: front - notched incisors, side 2 rows molars
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head small, profiles convexD 1st spine points forwardstail base - no blotchfront incisors not notched
upper molars - 3 rows -
head small, pointed, profiles convextail base: black blotchteeth = plain incisors at front, 3 rows molars at side
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head deep, steep top profileD: 1st spine small, projects forwardsfront teeth: flat incisors, narrow, narrower at base, in close-set bands