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By T. A. Jefferson

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5 m; 40 to 61 teeth in each row; palate with 2 deep longitudinal grooves (Fig. 110) . . . . . . Common dolphin (Delphinus delphis) p. 166 64b. No hourglass pattern on side; palatal grooves, if present, shallow . . . ) + 65 hourglass pattern stripe from chin to flipper Fig. 110 Delphinus delphis 65a. 6 m (Fig. 111) . . . . . Striped dolphin (Stenella coeruleoalba) p. 164 65b. Generally, no stripe from eye to anus; distribution limited to tropical and warm temperate waters . . . . .

2b. (Balaenidae or Neobalaenidae) + 3 Rostrum flat or only slightly arched in side view; from dorsal or ventral view, occipital condyles extending to or beyond posterior portion of cranium (Fig. 119) . . . . . . . . . . . . . . . . . . . rostrum strongly arched (Balaenopteridae or Eschrichtiidae) + 4 occipital condyles rostrum flat rostrum slightly arched rostrum moderately arched LATERAL VIEW Fig. 118 LATERAL VIEW Fig. 119 3a. Base of rostrum much wider than tip; from side, rostrum moderately arched (Fig.

Mysticeti) large (adults 1b . 5 m, except in Physeter) (Fig. 117) . . . (Odontoceti) + 2 +5 no bony symphysis \ skull bilaterally symmetrical no teeth DORSAL VIEW OF SKULL LATERAL VIEW OF SKULL DORSAL VIEW OF MANDIBLE Fig. 116 Mysticeti bony symphysis teeth skull asymmetrical DORSAL VIEW OF MANDIBLE tooth DORSAL VIEW OF SKULL LATERAL VIEW OF SKULL Fig. 117 Odontoceti Marine Mammals of the World 36 2a. Rostrum moderately to strongly arched in side view: from dorsal or ventral view, occipital condyles do not generally extend to or past posterior portion of cranium (Fig.

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