Mystery sea monster

[HBS Guy]

Giant 85 million-year-old mystery sea monster fossil finally identified

A brand new species of elasmosaur named Traskasaura sandrae has been identified from three specimens found on Vancouver Island.

(For info on elasmosaur see: https://en.wikipedia.org/wiki/Elasmosaurus )

Two individuals of Traskasaura sandrae hunt the ammonite Pachydiscus in the northern Pacific during the Late Cretaceous. Traskasaura sandrae, named today in the Journal of Systematic Paleontology, was declared the Provincial Fossil of British Columbia in 2023. (Image credit: Robert O. Clark)

Scientists have finally solved the mystery behind the identity of a prehistoric sea monster.
The marine reptile, which could grow to around 39 feet (12 meters) long and had heavy teeth for crushing prey, was previously known from several sets of fossils unearthed over the past two decades.

One key fossil was a complete but badly-preserved adult skeleton from about 85 million years ago, discovered in 1988 on Vancouver Island in British Columbia, Canada. It was thought to come from a group of long-necked reptiles known as plesiosaurs. However, until now, scientists weren't sure if it belonged to a new species or a previously discovered one.

New fossil found:

Abstract
The first elasmosaurid skeleton from the Haslam Formation (Upper Santonian) of the Nanaimo Group (Late Cretaceous) on Vancouver Island was first described in 2002, and has recently been declared the Provincial Fossil of British Columbia. Since then, additional fossils have been recovered: an isolated right humerus and a well-preserved, osteologically immature skeleton comprising thorax, girdles and limbs. The Haslam material can now support further taxonomic assessment, and we erect the species Traskasaura sandrae based on it. Traskasaura possesses a strange mosaic of features. The mandible is plesiomorphic as seen in Libonectes: relatively narrow with large teeth and a broad symphysis. The skull therefore lacks any of the radical oral cavity adaptations seen in basal aristonectines. The neck of the Haslam animal is also plesiomorphic, with at least 36 preserved cervical vertebrae having vertebral length indices (VLIs) over 100 (the total number of cervicals is not known). The centra lack the anteroposterior compression and midline longitudinal constriction characteristic of derived aristonectines, yet the cervical ribs trend forward – a condition known only in derived aristonectines and Vegasaurus. The autapomorphic coracoid of Traskasaura differs greatly from any known elasmosaurid; the cardiform recess is reduced and posteriorly located, with some similarities to that of Aristonectes quiriquinensis. The humerus is autapomorphic, possessing a relatively straight shaft, pronounced ventral camber and an articular facet on the leading edge that makes a 90° angle with the radial facet. Taken together, these features document a new genus, with a plesiomorphic axial skeleton, but with several convergent appendicular adaptations with derived aristonectines. A revised phylogenetic analysis of Elasmosauridae recovered the new taxon in a basal position. Therefore, the postcranial adaptations shared with derived aristonectines appear to be convergent.
https://zoobank.org/urn:lsid:zoobank.org:pub:CCD94C38-E0E7-43CE-B757-A387D055C229

Maybe now that high school dropout and moron Booby can see fossils are important but probably he can’t.

Elasmosaurs, like other plesiosaurs, lived throughout the Cretaceous period (145 to 66 million years ago) alongside the dinosaurs and shared the oceans with other marine reptiles, including ichthyosaurs and mosasaurs. Plesiosaurs were characterized by having small heads on long necks, broad bodies and four large, paddle-like limbs. The mythical Loch Ness Monster is usually depicted as a plesiosaur. They are thought to have breathed air and probably had to surface regularly, akin to modern-day marine mammals.

https://www.livescience.com/animals...mystery-sea-monster-fossil-finally-identified

Ammonites were precursors to modern day octopus, squid and cuttlefish. They made exponentially bigger compartments as they grew and these compartments formed a spiral.

Might do a post on spirals, did study them in Maths at uni.