Selachia is a noun that refers to the taxonomic group of cartilaginous fish known as sharks. Derived from the Greek word "selachos," meaning "cartilaginous fish," selachia encompasses around 500 known species of these powerful marine predators. Sharks have a unique and distinctive anatomical structure, with a skeleton made entirely of cartilage rather than bone.
Selachia are known for their streamlined bodies, powerful jaws, sharp teeth, and highly developed senses that make them excellent hunters in the aquatic ecosystem. They have a diverse range of shapes and sizes, ranging from the small dwarf lanternshark to the massive whale shark.
These fascinating creatures have lived on Earth for over 400 million years, making them older than dinosaurs. They can be found in oceans and seas worldwide, inhabiting various marine environments from shallow coastal areas to deep open waters.
Selachia play crucial roles in marine ecosystems as apex predators, helping to maintain the balance of the food chain. They feed on fish, other sharks, marine mammals, and even seabirds, exhibiting remarkable hunting strategies.
Sharks often face numerous threats, including overfishing, habitat destruction, and pollution. Despite their dangerous reputation, sharks are important for maintaining healthy oceans and promoting biodiversity. Scientists study selachia to better understand their behavior, biology, and conservation needs, aiming to protect these magnificent creatures and their habitats for future generations.
