Plesiosaur saur fossil lizard reptile, Russia 1909

Два плезиозавра юры и мела Европейской России. А. Рябинин.  С 5 рис. в тексте и 5 таблицами .

Zwei Plesiosaurier aus den Jura- und Kreideablagerungen Russlands. A. Riabinin. Mit 5 Abbildungen im Text und 5 Tafeln.

 in russian + german language.

A plesiosaur was a type of carnivorous aquatic (mostly marine) reptile. After their discovery, plesiosaurs were somewhat fancifully said to have resembled "a snake threaded through the shell of a turtle", although they had no shell. The common name 'plesiosaur' is applied both to the 'true' plesiosaurs (Suborder Plesiosauroidea) which includes both long-necked (elasmosaurs) and short-necked (polycotylid) forms and to the larger taxonomic rank of Plesiosauria, which includes the pliosaurs. The pliosaurs were the short-necked, large-headed plesiosaurians that were the apex predators for much of the Mesozoic. There were many species of plesiosaurs, while most of them were not as large as Elasmosaurus. Plesiosaurs ( Plesiosauroidea) appeared at the start of the Jurassic Period and thrived until the K-T extinction, at the end of the Cretaceous Period

Book´s  size 50 pages .          25 x 33,5 cm             Without title page.

0,333 kg.