. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel [5] Narwals (item ) and older Risso's dolphins (item 25a.) may lack teeth. [6] By feeling the lower jaws on the ventral surface and moving the finger towards the tip of the snout, one can feel the point at which the two lower jaws become united (called the symphysis). This location is a
. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel [5] Narwals (item ) and older Risso's dolphins (item 25a.) may lack teeth. [6] By feeling the lower jaws on the ventral surface and moving the finger towards the tip of the snout, one can feel the point at which the two lower jaws become united (called the symphysis). This location is an important reference point in distinguishing among some species of beaked whales. [7] Due to the subtlety and complexity of beaked whale systematics, non-specialists are discouraged from making more than generic dis- tinctions for the Mesoplodon group. Photographs are helpful, but for females and young, as well as adult males in some cases, specimen material is essential for reliable species identification. Please ensure that carefully recorded notes, photos and specimen materials reach such a specialist. 57. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leatherwood, Stephen; Stewart, Brent Scott; Folkens, Pieter A; Channel Islands National Marine Sanctuary (Agency : U. S. ); United States. National Marine Fisheries Service. Santa Barbara, Calif. : The Sanctuary
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