hydrozoa

Cnidarians Known as Hydroids: Animals Looking Like Plants

Once again we dive into Cnidaria, a large phylum that contains approximately 10,000 species. Phylum members include many animals that attract attention because of their bright colors: sea anemones, corals, sea pens, gorgonians and jellyfish. These creatures can afford to flaunt their beauty because most of them have defensive polyps loaded with nematocysts (also called cnidocytes) that can fire venomous miniature harpoons. Lucky for us, most of these weapons are too tiny to penetrate our skin. Cnidarians currently belong to one of four classes: Anthozoa […]

The Bizarre World of Pelagic Invertebrates

I have come to view the oceans as an immense bowl of salty soup. Billions of creatures ride its currents, some visible to the naked eye, but many so tiny they can only be seen under a microscope. Some creatures will eventually settle down and live their adult lives far from where they started out. Others will spend their entire lives offshore. The latter — in particular invertebrates that spend their lives adrift in the ocean — is what this article is about. Many are […]

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