Hydrotherosaurus
Encyclopedia
Hydrotherosaurus is an extinct genus of elasmosaurid
plesiosaur
from the Upper Cretaceous
(Maastrichtian
stage) of Fresno County, California
, measuring up to 13 m in length. The species H. alexandrae was named for its discoverer, Annie Montague Alexander
by Samuel Paul Welles
.
Elasmosauridae
Elasmosauridae was the family of plesiosaurs. They had the longest necks of the plesiosaurs and survived from the Late Triassic to the end of the Cretaceous. They had a diet of fish and shelless cephalopods.-Size:...
plesiosaur
Plesiosaur
Plesiosauroidea is an extinct clade of carnivorous plesiosaur marine reptiles. Plesiosauroids, are known from the Jurassic and Cretaceous Periods...
from the Upper Cretaceous
Cretaceous
The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...
(Maastrichtian
Maastrichtian
The Maastrichtian is, in the ICS' geologic timescale, the latest age or upper stage of the Late Cretaceous epoch or Upper Cretaceous series, the Cretaceous period or system, and of the Mesozoic era or erathem. It spanned from 70.6 ± 0.6 Ma to 65.5 ± 0.3 Ma...
stage) of Fresno County, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, measuring up to 13 m in length. The species H. alexandrae was named for its discoverer, Annie Montague Alexander
Annie Montague Alexander
Annie Montague Alexander was an American philanthropist and paleontological collector. She established the University of California Museum of Paleontology , Museum of Vertebrate Zoology , and financed their collections as well as a series of paleontological expeditions to the western United States...
by Samuel Paul Welles
Samuel Paul Welles
Samuel Paul Welles was an American palaeontologist, who was Research Associate at the Museum of Palaeontology, University of California, Berkeley. He took part in excavations at the 'Placerias Quarry' in 1930 and the Shonisaurus discoveries of 1954 and later, in what is now the Berlin-Ichthyosaur...
.