Protosiren Protosiren
Protosiren
Protosiren

Protosiren

Protosiren (†Protosiren (Abel, 1904))
 
Order: Sirenia
Family: †Protosirenidae
Dimensions: length - 2,7 m, weight - 250 kg
Temporal range: during the Middle Eocene of North America, Africa, Europe and Asia.
A typical representative: Protosiren fraasi
 
 
Protosiren is an extinct early genus of the order Sirenia. Protosiren existed throughout the Lutetian to Priabonian stages of the Middle Eocene. Fossils have been found in the far-flung locations like the United States (South Carolina, North Carolina and Florida, Africa (Egypt), Europe and Asia (India and Pakistan).
So far, five species have been named. From comparative anatomy and chronological order it has been suggested that P. fraasi, P. sattaensis and P. smithae respresent an ancestor-descendant lineage. P. eothene is the oldest and smallest species.
Like the extant sirenians (manatee and dugong), Protosiren is thought to have fed on sea grasses as well as freshwater plants. Unlike extant sirenians, Protosiren had hind limbs. Although the limbs were well-developed, they were small and the sacroiliac joint was weak. Consequently, Protosiren is thought to have been only or primarily aquatic, rarely venturing on to land. It has been speculated that it swam by caudal undulation and used its hind limbs to crawl along sea floors in nearshore habitats while feeding. It might have occupied a different ecological niche than the contemporary Eotheroides, which had a closer resemblance to modern sirenians.
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Protosiren (†Protosiren (Abel, 1904))
 
Order: Sirenia
Family: †Protosirenidae
Dimensions: length - 2,7 m, weight - 250 kg
Temporal range: during the Middle Eocene of North America, Africa, Europe and Asia.
A typical representative: Protosiren fraasi
 
 
Protosiren is an extinct early genus of the order Sirenia. Protosiren existed throughout the Lutetian to Priabonian stages of the Middle Eocene. Fossils have been found in the far-flung locations like the United States (South Carolina, North Carolina and Florida, Africa (Egypt), Europe and Asia (India and Pakistan).
So far, five species have been named. From comparative anatomy and chronological order it has been suggested that P. fraasi, P. sattaensis and P. smithae respresent an ancestor-descendant lineage. P. eothene is the oldest and smallest species.
Like the extant sirenians (manatee and dugong), Protosiren is thought to have fed on sea grasses as well as freshwater plants. Unlike extant sirenians, Protosiren had hind limbs. Although the limbs were well-developed, they were small and the sacroiliac joint was weak. Consequently, Protosiren is thought to have been only or primarily aquatic, rarely venturing on to land. It has been speculated that it swam by caudal undulation and used its hind limbs to crawl along sea floors in nearshore habitats while feeding. It might have occupied a different ecological niche than the contemporary Eotheroides, which had a closer resemblance to modern sirenians.
Reviews (3):
Митрич
10.07.2021
Кстати, Eotheroides - явный дюгонгид, с двойным хвосовым плавником как у китов и редуцированными задними плавничками.... Возможно с маленькими , но невыступающими коническими бивнями....Вот Роман изваял бы этого первого полностью водного сиренида - стало бы понятно когда и как сирены попрощались с пра-Матерью Землей и ушли в море..........Как и киты, только на веганской диете остались.....
Митрич
10.07.2021
Согласен - работа классная! Это следующая ступень после ногастых, по суше ходящих сиреновых Prorastomus и Pezosiren.... В Гишпании кажется нашли подобного протосиренида как этот - собрарбесирена (Sobrarbesiren Протосирениды, в отличие от прорастромидов, уже вальяжно разгуливать не могли по суше, у них задние лапки уже тазик не держали, были слабыми и они скорее всего, ползали на брюхе по суше, як ластоногие....Кажется следующим, уже полностью водным сиреном был эотероид - Eotheroides, у которого от задних лапок одни маленькие редуцированные плавнички остались, абсолютно бесполезные, как у древних китов.... И протосирены, и эотероиды около 48-47 млн. лет назад кажется, водились еще в солоноватых эстуариях рек и мангровых зарослях на побережьях Индостанского субконтинента, который еще не совсем причленился к Азии...
Scott Taylor
14.05.2021
Nice reconstruction of this amazing prehistoric species of Siren, amazing work.