The dermal denticles are small and overlapping, each with a leaf-shaped crown bearing a median ridge and three marginal teeth.
12.
The small, overlapping dermal denticles each have a leaf-shaped crown with a median ridge and three teeth on the posterior margin.
13.
The dermal denticles are tiny and arrowhead-shaped, with a median ridge in males and both median and lateral ridges in females.
14.
The body is covered by small, slightly overlapping dermal denticles, which are leaf-shaped with a median ridge and three marginal teeth.
15.
The tiny, well-spaced dermal denticles, each bearing a median ridge and three posterior points, give the skin a velvety texture.
16.
The body is covered by small, overlapping dermal denticles, each with a teardrop-shaped crown with a median ridge and three marginal teeth.
17.
The sei whale, like other rorquals, has a single median ridge, as well as a slightly arched rostrum, which is accentuated at the tip.
18.
The body is densely covered by small, overlapping dermal denticles with a median ridge and a single cusp, though a few may be three-cusped.
19.
The venter, underneath, is flat, the dorsum, above, broadly rounded with a median ridge or keel and lateral angles acute . ( Sweet 1964 ).
20.
The closely overlapping dermal denticles are very thin and transparent; each is longer than it is broad, bearing a distinct median ridge and two lateral ridges ending in marginal teeth.
