Stauromedusae
Stauromedusae, also known as stalked jellyfish, are a small order of cnidarians, a group that includes jellyfish, corals, sea anemones, and hydroids. Unlike most jellyfish, which are free-swimming, stauromedusae are attached to surfaces like rocks, seaweeds, and even shellfish. They are found primarily in colder waters of the northern and southern hemispheres, with a few species inhabiting tropical regions.
Characteristics
Stauromedusae possess several distinct characteristics that set them apart from other jellyfish:
- Stalk: They have a stalk or peduncle that attaches them to a substrate.
- Bell-shaped body: Their body is usually bell-shaped or disc-shaped, with a central mouth opening.
- Tentacles: They possess numerous tentacles around the bell's margin, which are used for capturing prey.
- Polyps: They undergo a life cycle that includes a polyp stage, unlike most jellyfish that have a medusa stage as their primary form.
- Size: Stauromedusae are generally small, ranging from a few millimeters to a few centimeters in diameter.
Environments
Stauromedusae are predominantly found in cold-temperate and polar waters, with some species occurring in warmer regions. They prefer shallow, coastal environments, where they can attach themselves to various substrates. They are often found in tide pools, on seaweeds, or on rocky surfaces.
References
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