Table II- 1. Ranges in number of teeth in each side of upper and lower jaws of eastern North Pacific odontocetes. (Adapted from Leathe 

 Perrrin and Evans, 1982, Table 2.) 



od, Re 



Remarks 



Upper teeth rarely emerge; lower teeth fit into sockets in upper jaw. 



At tip of lower jaw; sometimes 2nd pair behind the first in older animals. 



At tip of lower jaw.^ 



At tip of lower jaw. ' 



Teeth emerge from prominent arches behind tip of snout on either side of 



lower jaw. 

 On raised area medlength along lower jaw. 

 On prominences near corner of mouth; forward tilting. 

 About V2 way from tip of snout to gape.^ 

 Near tip of lower jaw. 



Prominent; curved and oriented backward and inward; pointed. 

 Prominent; pointed and curved. 



Near front of jaw; may have fallen out in older specimens; sometimes teeth in 



upper jaw. 

 As few as 8 in older adults due to attrition. 

 One (rarely two) pierce gum to become straight, spiraled external tusk to 3 m 



long.' 



Tooth crown is sometimes marked by many fine vertical wrinkles. 

 Lower teeth smaller; many specimens have fewer teeth on right side than on 

 left. 



Rarely 10-11; curved inward and backward, fit into sockets of upper jaw. 

 Rarely 13 on lower jaw; curved backward and inward, fit into sockets in 

 upper jaw. 



Spade-shaped and relatively small. 



Spade-shaped. 



Peg-like teeth, extremely fine and sharp. 



' It is important to remember that for species reported by a small number of specimens, tooth counts (ranges) may not fairly represent the range for the entire species and should, 



therefore, be used cautiously. 

 -Usually erupted from gums only in adult males. 

 'May have additional vestigial teeth in either |aw. 



Table 11-2. Body size; number, maximum dimensions, and description of baleen plates; and number and relative length of \entral grooves of eastern 

 North Pacific mvsticetes. (Adapted Irom Leatherwood, Reeves, Perin and Evans, 1982, Table 1.) 



Common 

 Name 



Maximum 

 # of Dimension 

 Page of Maximum Baleen of Plates (cm ) 

 Scientific Species Length Plates base 



Name Account (meters) per side length width 



Color of Baleen 



Blue whale 

 Fin whale 

 Sei whale 



Bryde's 



whale 

 Humpback 



whale 

 Bowhead 



whale 

 Right 



whale 

 Cray 



whale 

 Minke 



whale 



Balaenoptera 

 musculus 



Balaenoptpera 

 physalus 



Balaenoptera 

 borealis 



Balaenoptera 



edeni 

 Megaptera 



novaeangliae 

 Balaena 



mysticetus 

 Eubalaena 



glacialis 

 Eschrichtius 



robustus 

 Balaenoptera 



acutorostrata 



10 

 14 



14 

 6 



15 



4 

 16 



26 



24 



14 

 16 

 18 

 17 

 14 

 10 



270-395 

 262-473 



84 

 70 



30 All black with black bristles 



30 Bluish grey with yellowish-white stripes; front 

 Vi-'A on right side all white 

 15.6 219-402 75-80 39 Ash black with blue tinge and fine, light bristles; 35-60 

 some near front may be light 



255-365 42 

 270-400 80 



24 Slate grey with lighter grey bristles 



15-35 



13 Black to olive brown, sometimes whitish; bristles 10-35 

 generally olive brown, sometimes whitish 

 230-360 430 36.5 Dark grey to black; fringes slightly lighter 



206-268 280 30.5 Dirty or yellowish grey; black fringes, some 



anterior plates partly or all white 

 138-180 37 18 Yellowish white to white 



35-70 



231-285 21 



10 White to yellowish white; posterior plates may 15-25 

 be brown or black 



32 60 Ends about '/: way 



between flippers & 

 umbilicus 

 40-50' At least to umbilicus 



14-22 At least to umbilicus 



None 



None 



None 2-5 longitudinal creases 



on chin and throat 

 50-70 End short of umbilicus, 



often just behind 



flippers 



' Suspected range is greater for the species in as much as many probable Bryde's whales were previously lumped with sei whales. 

 64 



