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Hydroids: Hydrozoa - No Common Name (aglantha Digitale): Species Accounts

umbrella lives ocean people

Physical characteristics: Aglantha digitale (abbrviated as A. digitale) is a medusa with a cylindrical umbrella that is about three-eighths of an inch to 1.5 inches (10 to 40 millimeters) high. The umbrella is about twice as tall as it is wide and has a small cone at the top. The mouth has four simple lips. Eight long, sausage-shaped sex glands hang freely inside the hydroid just under the top of the umbrella. A. digitale has eighty or more very short tentacles at the base of its umbrella.


Geographic range: A. digitale lives in the Arctic Ocean and in the northern parts of the Atlantic and Pacific oceans. Specific distribution map not available.


Habitat: A. digitale lives in the open ocean from the surface down to about 2000 feet (600 meters).


Diet: A. digitale eats animal plankton.

Aglangha digitale lives in the Arctic Ocean and in the northern parts of the Atlantic and Pacific oceans. (Illustration by Emily Damstra. Reproduced by permission.)

Behavior and reproduction: A. digitale uses its entire umbrella for jet propulsion. Males release sperm and females release eggs into the water. When fertilization occurs, a free-floating larva develops.


Aglantha digitale and people: A. digitale has no known importance to people.


Conservation status: A. digitale is not threatened or endangered. ∎

Aequorea victoria secretes a protein that produces a blue light when it reacts with the calcium in seawater. The polyp form and newly released medusae are tiny and rarely seen. (© Mick McMurray/SeaPics.com)

Hydroids: Hydrozoa - No Common Name (aequorea Victoria): Species Accounts [next] [back] Hydroids: Hydrozoa - No Common Name (distichopora Violacea): Species Accounts

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