Shark Details

Fossil shark tooth (size over 9 cm or 3.5 inches) with crown, shoulder, root and root lobe A collection of Cretaceous shark teeth The oldest total-group chondrichthyans, known as acanthodians or "spiny sharks", appeared during the Early Silurian, around 439 million years ago. [15] The oldest confirmed members of Elasmobranchii sensu lato (the group containing all cartilaginous fish more. Sharks star in blockbuster movies as blood-seeking villains, but in reality they're far more fascinating and complicated than they're often depicted in pop culture.

Based on fossilized teeth. Sharks are cartilaginous fish with diverse shapes, sizes, and diets, inhabiting all oceans and playing crucial roles in marine ecosystems. Sharks Facts and Information.

Facts about species, anatomy, distribution, reproduction, conservation and relation with humans. Facts about many sharks from the eight orders of sharks from the Shark Research Institute (SRI). SRI conducts and sponsors rigorous, peer-reviewed field research about sharks and uses science-based information to educate and advocate for shark conservation policies and protections by the world's governing bodies, including CITES.

Sharks are ancient, diverse predators with over 500 species. They're vital to ocean health. Wherever they live, sharks play an important role in ocean ecosystems-especially the larger species that are more "scary" to people.

Sharks and their relatives were the first vertebrate predators, and their prowess, honed over millions of years of evolution, allows them to hunt as top predators and keep ecosystems in balance. Sharks are often characterised as vicious killers, but in reality, they're a diverse and endangered group of creatures that add tremendous value to marine ecosystems. Discover sharks: 500+ species of ancient, cartilaginous predators known for unique senses, varied habitats, and remarkable evolution.

100 Facts About Sharks You Must Know: Ancient Predators: Sharks have been around for over 400 million years, making them older than dinosaurs. Diverse Species: There are over 500 known species of sharks, each with unique characteristics and adaptations. Apex Predators: Many shark species are at the top of the ocean food chain, regulating the populations of other marine animals.

Varied Sizes.