[development-note] "The tongue has contributions from all pharyngeal arches which changes with time. The tongue initially begins as swelling rostral to foramen cecum, the median tongue bud.. tongue muscles derive from the somites - http://php.med.unsw.edu.au/embryology/index.php?title=Tongue_Development#Pharyngeal_Arch_Contributions"; [homology-note] "Most adult amphibians have a tongue, as do all known reptiles, birds and mammals. Thus it is likely that the tongue appeared with the establishment of tetrapods and this structure seems to be related, to some extant, to the terrestrial lifestyle.[well established][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0000419", ontology="VHOG", source="DOI:10.1046/j.1469-7580.2002.00073.x Iwasaki S, Evolution of the structure and function of the vertebrate tongue. J Anat (2002)", source="http://bgee.unil.ch/"}; [taxon-note] "Many species of fish have small folds at the base of their mouths that might informally be called tongues, but they lack a muscular structure like the true tongues found in most tetrapods"