Dec 24, 2025 · cnidarian, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, …

Cnidarians mostly have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes, which are specialized …

May 5, 2025 · Cnidarians all have a simple body with a mouth and tentacles for feeding. Some cnidarians can swim like jellyfish, while others, like corals, are fixed to one spot. Cnidarians have …

If collar cells and spicules are defining characteristics of the Phylum Porifera, then nematocysts define cnidarians. These tiny organelles, likened by Hickman to cocked guns, are both highly efficient …

Aug 24, 2024 · What are cnidarians with types, examples, & habitat. How do they eat, move, and reproduce. Also, know their body symmetry, lifecycle, and organ system with pictures.

Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes. Yet, these diverse animals are all …

Nearly all (about 99 percent) cnidarians are marine species. The defining cell type for the cnidarians is the cnidocyte, or stinging cell. These cells are located around the mouth and on the tentacles, and …

Cnidarians are predominantly aquatic animals, with the vast majority inhabiting marine environments worldwide. They are found from frigid polar regions to warm tropical seas, and from shallow tide …

Most cnidarians have the ability to sense changes in light and dark. Box jellies have eyes that are able to form images, making them the most derived cnidarians in terms of sensory biology. Finally, most …

Cnidarians are a diverse group of animals that belong to the phylum Cnidaria. They are characterized by the presence of specialized stinging cells called cnidocytes, which are used for defense and …