Starfish - Wikipedia
Starfish, such as the ochre sea star (Pisaster ochraceus) and the reef sea star (Stichaster australis), have become widely known as examples of the keystone species concept in ecology.
Sea star | Echinoderm Anatomy & Adaptations | Britannica
2024年11月11日 · A number of sea star genera distributed throughout the Northern Hemisphere have longer, more pointed, spine-fringed arms; among these genera are Astropecten, Psilaster, and Luidia. The largest West Indies sea star, Oreaster reticulatus, is …
12 Surprising Facts About Starfish - ThoughtCo
2024年6月7日 · Sea stars belong to the phylum Echinodermata. That means they are related to sand dollars, sea urchins, sea cucumbers, and sea lilies. Overall, this phylum contains approximately 7,000 species. Many echinoderms exhibit radial symmetry, meaning their body parts are arranged around a central axis.
Sea Star - Description, Habitat, Image, Diet, and Interesting Facts
Sea stars, also known as starfish, are easily recognized marine creatures. Despite the nickname “starfish,” the sea star is not a fish at all! These star-shaped animals are surprisingly interesting creatures. Read on to learn about the sea star.
Sea Stars, Urchins, and Relatives - Smithsonian Ocean
A brittle star looks much like a sea star, though its center body is in the shape of a disk and its extending arms are often serpentine. Some look like a true star with radiating arms while others, like the basket stars, have branching arms that look like a web of tree roots. There are over 2,000 species of brittle stars. Many live in the deep sea.
Starfish (Sea Stars) - National Geographic
There are some 2,000 species of sea star living in all the world’s oceans, from tropical habitats to the cold seafloor. The five-arm varieties are the most common, hence their name, but species...
Sea Star - National Geographic Kids
Sea Star. You probably know sea stars as starfish, the name sea stars are commonly known by. But sea stars aren’t really fish. Sea stars, like sea urchins and sand dollars, do not...
7 Facts About Sea Stars That Are Out of This World
2019年1月3日 · Sea stars lack a number of fishy anatomical features, including gills, scales or fins. Categorized in the phylum Echinodermata, they’re invertebrates, and are related to sand dollars, sea urchins, sea cucumbers and sea lilies.
starfish summary | Britannica
starfish, or sea star , Any of 1,800 echinoderm species (class Asteroidea) that have regenerable arms surrounding an indistinct disk and that inhabit all oceans.
Common starfish - Wikipedia
The common starfish, common sea star or sugar starfish (Asterias rubens) is the most common and familiar starfish in the north-east Atlantic. Belonging to the family Asteriidae, it has five arms and usually grows to between 10–30 cm across, although larger …