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Sirenia Look for this name in NCBI Wikipedia Animal Diversity Web
http://palaeo-electronica.org/content/fc-1 Benton et al. 2015
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Sirenian remains, referrable to "halitheriine" dugonids from the Mokattam Hills in Egypt, have been interpreted as Lutetian, or middle Eocene (Domning et al., 2010; Sickenberg, 1934) with a minimum bound of 47.8 - 0.2 Ma.
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Paleogene strata have yielded abundant sirenian remains, including stem taxa, for much of the Eocene (Domning et al., 2010). Tethythere (i.e., Sirenia-Proboscidea) remains are known from the Paleocene and early Eocene (Gheerbrant, 2009), but lack crown Sirenia. Hence, we define the paleontological soft maximum constraint as the base of the Paleocene, equivalent to the base of the Danian marine stage at 66.04 Ma ± 0.4 Myr = 66 Ma.
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Eotherioides is identified by Domning et al. (2010) and Gheerbrant (2005) as more closely related to Dugong than to Trichechus, and it shows apomorphies of Dugongidae, including retention of an upper dental formula of 184.108.40.206, and the deciduous P5 is not replaced (Domning et al., 2010). It is therefore nested within crown Sirenia.
Domning, D. P., Zalmout, I. S. & Gingerich, P. D. (2010) Sirenia. In: Cenozoic Mammals of Africa, (Werdelin, L. & Sanders, W. J., eds.). pp. 147-160. University of California Press, Berkeley.
Gheerbrant, E. 2005. Paleocene emergence of elephant relatives and the rapid radiation of African ungulates. Proceedings of the National Academy of Sciences,106: 10717-10721.
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