Editing Pygmy sperm whale (section)

===Teeth===
The pygmy sperm has between 20 and 32 teeth, all of which are set into the [[Anatomical terms of location#Cranial and caudal|rostral]] part of the lower jaw.<ref name=Bloodworthetal2008>{{cite journal | author = Bloodworth Brian E., Odell Daniel K. | year = 2008 | title = Kogia breviceps | url = http://www.deepdyve.com/lp/allen-press/kogia-breviceps-cetacea-kogiidae-wM6JPlBunF/10 | journal = Mammalian Species | volume = 819 | pages = 1–12 | doi=10.1644/819.1| doi-access = free }}</ref> Unusually, adults lack [[Tooth enamel|enamel]] due to a mutation in [[MMP20|the enamelysin gene]],<ref>{{Cite journal | doi=10.1098/rspb.2010.1280| pmid=20861053| pmc=3049022| title=Pseudogenization of the tooth gene enamelysin (MMP20) in the common ancestor of extant baleen whales| journal=Proceedings of the Royal Society B: Biological Sciences| volume=278| issue=1708| pages=993–1002| year=2010| last1=Meredith| first1=R. W.| last2=Gatesy| first2=J.| last3=Cheng| first3=J.| last4=Springer| first4=M. S.}}</ref> although enamel is present in very young individuals.<ref name=Bloodworth2008>{{cite journal |author1=Bloodworth, B.E.  |author2=Odell, D.K.  |name-list-style=amp | year = 2008 | title = ''Kogia breviceps'' (Cetacea: Kogiidae) | journal = Mammalian Species | pages = Number 819: pp. 1–12 | doi = 10.1644/819.1 | volume=819| doi-access = free }}</ref>

[[File:Pygmy_sperm_whale_teeth.jpg|thumb|200px|Pygmy whale teeth on its lower rostrum]]