Protosiren is an extinct early genus of the order Sirenia. Protosiren existed throughout the Lutetian to Priabonian stages of the Middle Eocene.

Protosirenidae is an extinct primitive family of the order Sirenia. [1][2] Protosirenids are thought to have been amphibious quadrupeds, meaning that they spent their time both on land and in the water and had four legs. [3] ^ D. P. Domning, G. J. Heal, and S. Sorbi. 2017.

2024年6月1日 · Protosiren is an extinct early genus of the order Sirenia. Protosiren existed throughout the Lutetian to Priabonian stages of the Middle Eocene.

2022年5月1日 · Protosirenids differ from dugongids in the form of the brain, size and separation of nasal bones, and conformation of the anterior mandible. Protosirenids also differ in having vertebrae with larger neural canals, in having ligamentous rib articulations, and in lacking the pachyostotic ribs characteristic of dugongids.

2001年10月11日 · Here I describe Eocene fossils from Jamaica that represent nearly the entire skeleton of a new genus and species of sirenian—the most primitive for which extensive postcranial remains are known.

A recent revelation has come to our attention, revealing the remarkably well-preserved post-cranial remains belonging to Protosiren. These remains include vertebrae, ribs, and fragmentary bones, and were discovered from two different horizons located in the Mokattam Formation of El-Galala Plateau, North Eastern Desert of Egypt.

The sealatee (Protosiren modernus) is a species of large amphibious mammal of the order Sirenia that originally lived throughout the Lutetian and Bartonian stages of the Middle Eocene as an...

Discover the remains of Protosiren, an ancient sirenian, in northwestern Germany. Learn about its evolution and the impact of warm waters on its distribution. Explore the relationship between sirenians and megatooth sharks.

这项研究记录了Protosiren首次出现在埃及东北沙漠El-Galala高原的中始新世（巴托期）Observatory Formation的装饰性石灰岩中。 这一发现具有重要意义，为我们提供了深入了解这种古代海洋哺乳动物的机会，有助于揭示其进化历史以及在古代生态系统中的角色。

Features of Protosiren that are generally diagnostic include the presence of large keyhole-shaped neural canals perforating thoracic vertebrae, presence of cartilaginous rather than synovial articulations of rib heads, and a lack of rib pachyostosis. Protosiren eothene is the oldest and smallest species of Protosiren known to date.