River Monsters - Netflix

Posted on Sat 08 June 2019 in netflix

In River Monsters, join host, biologist and extreme angler Jeremy Wade, as he catches the extraordinary and supersized fish that lurk in our planet's rivers and lakes. Traveling the globe and risking his life, he searches for mysterious freshwater predators, on a mission to test the myths surrounding these almost supernatural creatures.

River Monsters - Netflix

Type: Documentary

Languages: English

Status: Running

Runtime: 60 minutes

Premier: 2009-04-05

River Monsters - Helicoprion - Netflix

Helicoprion is a genus of extinct, shark-like eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called “tooth whorls”— the cartilaginous skull, spine, and other structural elements have not been preserved in the fossil record, leaving scientists to make educated guesses as to its anatomy and behavior. Helicoprion lived in the oceans of the early Permian 290 million years ago, with species known from North America, Eastern Europe, Asia, and Australia. The closest living relatives of Helicoprion (and other eugeneodontids) are the chimaeras.

River Monsters - H. davisii - Netflix

H. ferrieri was originally described as a species of the genus Lissoprion in 1907, from fossils found in the Phosphoria Formation of Idaho. An additional specimen, tentatively referred to H. ferrieri, was described in 1955. That specimen was found in Wolfcampian-age quartzites exposed on China Mountain, six miles southeast of Contact, Nevada. The 100-mm-wide fossil consists of one and three-quarters whorls and about 61 preserved teeth. Due to weathering, the rest of the fossil was lost and the preserved section is distorted from slippage of the host rock. While initially differentiated using the metrics of tooth angle and height, Tapanila and Pruitt considered these characteristics to be intraspecifically variable, reassigning H. ferrieri to H. davisii. H. jingmenense was described in 2007 from a nearly complete tooth whorl with four and a third volutions (part and counterpart) found in the Lower Permian Qixia Formation of Hubei Province, China. It was discovered during road construction. The specimen is very similar to H. ferrieri and H. bessonowi, though it differs from the former by having teeth with a wider cutting blade, and a shorter compound root, and differs from the latter by having fewer than 39 teeth per volution. Tapanila and Pruitt argued that the specimen was partially obscured by the surrounding matrix, resulting in an underestimation of tooth height. Taking into account intraspecific variation, they synonymized it with H. davisii.

H. davisii was described initially from a series of 15 teeth found in Western Australia. They were described by H. Woodward in 1886 as a species of Edestus, E. davisii. Upon naming H. bessonowi, Karpinsky also reassigned this species to Helicoprion, an identification subsequently supported by the discovery of two additional and more complete tooth whorls in Western Australia. The species is characterized by a tall and widely spaced tooth whorl, with these becoming more pronounced with age. The teeth also noticeably curve forwards. During the Kungurian and Roadian, this species was very common worldwide.

River Monsters - References - Netflix