Dugongidae

dugongiddugongcf. Dugongidae indet.Dugongidae indet.dugongsmanatee
The Dugongidae are a family in the order of Sirenia.wikipedia
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Sirenia

sireniansea cowsirenians
The Dugongidae are a family in the order of Sirenia.
The Sirenia currently comprise the families Dugongidae (the dugong and, historically, Steller's sea cow) and Trichechidae (manatees) with a total of four species.

Dugong

dugongsDugonginaeDugong dugon
The family has one surviving species, the dugong (Dugong dugon), one recently extinct species, Steller's sea cow (Hydrodamalis gigas), and a number of extinct genera known from fossil records.
It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century.

Steller's sea cow

Hydrodamalis gigasSteller sea cow(Steller's) sea cow
The family has one surviving species, the dugong (Dugong dugon), one recently extinct species, Steller's sea cow (Hydrodamalis gigas), and a number of extinct genera known from fossil records.
It was a part of the order Sirenia and a member of the family Dugongidae, of which its closest living relative, the 3 m long dugong (Dugong dugon), is the sole surviving member.

Eotheroides

Eotheroides clavigerum
The genera Eosiren, Eotheroides, and Prototherium have been assigned to Halitheriinae in the past, but recent cladistic analysis recovers these genera as basal to the clade formed by Trichechidae and Dugongidae.
It is an early member of the family Dugongidae, which includes the extant dugong.

Kaupitherium

Kaupitherium is an extinct dugongid sea cow that lived during the Oligocene.

Halitherium

Halitherium alleniHalitherium schinziiHalitherium schinzi
Halitherium is an extinct dugongid sea cow that arose in the late Eocene, then became extinct during the early Oligocene.

Culebratherium

Culebratherium alemani
Culebratherium is an extinct genus of dugongid sirenian mammal which existed in what is now Panama during the Early Miocene.

Eosiren

The genera Eosiren, Eotheroides, and Prototherium have been assigned to Halitheriinae in the past, but recent cladistic analysis recovers these genera as basal to the clade formed by Trichechidae and Dugongidae.

Italosiren

Italosiren is an extinct genus of early dugong from late Oligocene (Chattian) marine deposits in northern Italy.

Nanosiren

Nanosiren garciae?Nanosiren sp.Nanosiren cf. garciae
Nanosiren garciae is an extinct sirenian dugong that lived in warm shallow seas in what is now Venezuela, approximately 11.610—3.6 Ma during the Miocene and Pliocene.

Prototherium

Prototherium ausetanum
The genera Eosiren, Eotheroides, and Prototherium have been assigned to Halitheriinae in the past, but recent cladistic analysis recovers these genera as basal to the clade formed by Trichechidae and Dugongidae.

Hydrodamalinae

Hydrodamalinae is a recently extinct subfamily of the sirenian family Dugongidae.

Dioplotherium

Dioplotherium sp.Dioplotherium allisoni