The term cnidaria derives from the Ancient Greek word knídē (κνίδη “nettle”), signifying the coiled thread reminiscent of cnidocytes. The word was first coined in 1766 by the … વધુ જુઓ

Sexual
Cnidarian sexual reproduction often involves a complex life cycle with both polyp and medusa stages. For example, in Scyphozoa વધુ જુઓ

Many cnidarians are limited to shallow waters because they depend on endosymbiotic algae for much of their nutrients. The life … વધુ જુઓ

Cnidarians form a phylum of animals that are more complex than sponges, about as complex as ctenophores (comb jellies), and less complex than વધુ જુઓ

Basic body forms
Most adult cnidarians appear as either free-swimming medusae or sessile polyps, and many વધુ જુઓ

Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla. … વધુ જુઓ

Fossil record
The earliest widely accepted animal fossils are rather modern-looking cnidarians, possibly from around વધુ જુઓ