What is Mysticeti?
{{Taxobox | name = Baleen whales | fossil_range = latest [[Eocene]] - Recent | image = Humpback stellwagen edit.jpg | image_width = 250px | image_caption = ''[[Humpback whale]] breaching'' | regnum = [[Animal]]ia | classis = [[Mammal]]ia | ordo = [[Cetacea]] | subordo = '''Mysticeti''' | subordo_authority = [[Edward Drinker Cope|Cope]], 1891 | subdivision_ranks = [[Family (biology)|Families]] | subdivision = [[Balaenidae]]<br /> [[Balaenopteridae]]<br /> [[Eschrichtiidae]]<br /> [[Neobalaenidae]]<br /> [[Janjucetidae]]†}} [[File:Baleen.jpg|thumb|Baleen]] The '''Mysticeti''' <ref>The scientific name comes from the [[Greek language|Greek]] word ''mystidos'', which means 'unknowable'.</ref> are one of the two suborders of the [[Cetacea]].<ref>The other being the [[Odontoceti]], or toothed whales.</ref> They are often called '''baleen whales''', or 'whalebone whales' or 'great whales'. Baleen whales have baleen plates made of [[keratin]]. The difference is connected with feeding. Baleen whales strain [[plankton]] out of the water, whereas the [[Odontoceti]] (toothed whales) eat larger prey. The suborder contains four [[Family (biology)|families]] and fourteen [[species]].<ref>Mead, James G. & Brownell, Robert L. Jr. 2005. Order Cetacea (pp. 723-743). In Wilson, Don E. and Reeder, DeeAnn M. eds. ''Mammal species of the world: a taxonomic and geographic reference''. 3rd ed, Baltimore: Johns Hopkins University Press, 2 vols. {{ISBN|978-0-8018-8221-0}}. OCLC 62265494.</ref> == Baleen == Baleen whales do not have [[teeth]], except as embryos. [[Fossil]] adult baleen whales did have teeth, but modern adults have only baleen. The embryo teeth are replaced by baleen, which look like a curtain of long plates hanging down from the top of the whale's mouth.<ref name=Fudge>Fudge D.S., Szewciw L.J. and A.N. Schwalb. 2009. Morphology and development of blue whale baleen: an annotated translation of Tycho Tullberg's classic 1883 paper. ''Aquatic mammals'' '''35'''(2):226-252.</ref> Those plates might be 12 feet long, and a fo