. Cetaceans of the Channel Islands National Marine Sanctuary. Cetacea; Mammals. b. Distinctive white head markings absent; mound or convexit\' m front of blowhole absent: exposed tusks of males tilted forward, with denticle positioned near front edge; tusks protrude rela- tively far above gumline and often are worn along front edge; maximum body length less than 6 m. Females and young require museum preparation for positive identification. Subarctic dis- tribution. [7] * Stejneger's Beaked Whale, Mcsoplodon stcjnigm fP) c. Uniformly dark beak; forehead of males lacking prominent characteristic
. Cetaceans of the Channel Islands National Marine Sanctuary. Cetacea; Mammals. b. Distinctive white head markings absent; mound or convexit\' m front of blowhole absent: exposed tusks of males tilted forward, with denticle positioned near front edge; tusks protrude rela- tively far above gumline and often are worn along front edge; maximum body length less than 6 m. Females and young require museum preparation for positive identification. Subarctic dis- tribution. [7] * Stejneger's Beaked Whale, Mcsoplodon stcjnigm fP) c. Uniformly dark beak; forehead of males lacking prominent characteristic of fa ); single thin, mandibular tusk on either side of mouth, barely breaking gumline; maximum body length 5 m. Females and young require museum preparation for positive identification. Tropical to subtropical distribution. * Ginkgo-toothed Beaked Whale, Mcsoplodon gmkgodms (B) d. White markings on beak and forehead absent; lower jaw usually light in color; teeth (tusks) exceptionally large, located on bony prominences near corners of mouth, and oriented slightK' tor- ward; corners of mouth, particularly in adult males, have high- arching contour; lower jaw massive ("dense'j; forehead marked by depression or concavity in front of blowhole; maximum body length 5m. Females and young require museum preparation for positive identification. Cosmopolitan distribution. * Blainville's Beaked Whale, Mcsoplodon dcnsirosms (B) 17. a. Rostrum, if present, not sharply demarcated from forehead Go to 18 b. Distinct, though sometimes short rostrum separated from the forehead by a distinct crease Go to 30 18. a. Teeth spade shaped, laterally compressed and relatively small Go to 19 b. Teeth conical and sharply pointed (in cross section circular, or slightly flattened anterpostcriorly) Go to 22 19. a. Body to m, extremely robust with pronounced thickened keel; dorsal fin subtriangular, usually black and gray or white; head very small relative to body size; striking black body with lar
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Keywords: ., bookcentury1900, bookcoll, booksubjectcetacea, booksubjectmammals
