Mammalia - Sirenia - Dugongidae
Alternative spelling: Metaxitherium
Invalid subtaxa: Cheirotherium Bruno 1839, Chirotherium Bruno 1839, Felsinotherium Capellini 1872, Felsinotherium gunteri Simpson 1932 [nomen nudum], Fucotherium Kaup 1840, Furcotherium Kaup 1840, Halianassa, Halitherium beaumonti de Christol 1844 [nomen dubium], Halitherium beaumontii de Christol 1844 [nomen dubium], Halysiren Kretzoi 1941, Haplosiren Kretzoi 1951, Hesperosiren Simpson 1932, Metaxytherium beaumonti de Christol 1844 [nomen dubium], Metaxytherium beaumontii de Christol 1844 [nomen dubium], Metaxytherium meyeri Abel 1904 [nomen dubium], Pontotherium Kaup 1840
Full reference: J. de Christol. 1840. Nouveau genre de Cetace fossile. L'Institute 8th year(352):322-323
Parent taxon: Halitheriinae according to D. P. Domning 2008
Sister taxa: Caribosiren, Eosiren, Eotheroides, Halitherium, Prototherium, Thalattosiren
Subtaxa: Metaxytherium aquitaniae, Metaxytherium arctodites, Metaxytherium crataegense, Metaxytherium floridanum, Metaxytherium krahuletzi, Metaxytherium lovisati, Metaxytherium medium, Metaxytherium riveroi, Metaxytherium serresii, Metaxytherium subapenninum
Type: Thalattosiren petersi
Ecology: aquatic herbivore