Tag Archive: cnidarian

Kingdom: Animalia
Phylum: Cnidaria
Class: Scyphozoa
Order: Semaeostomeae
Family: Pelagiidae

Genus/species: Chrysaora fuscescens

GENERAL CHARACTERISTICS: The sea nettle is a giant, semitransparent jellyfish, with an amber-colored, swimming bell commonly as large as 30 cm (12 inches) in diameter, with some measuring more than a meter. In addition to four oral arms attached to the underside of the mouth, the sea nettle has 24 long tentacles around the perimeter of the bell that extend up to 4 m (13 ft).

DISTRIBUTION/HABITAT: Marine, found along the westcoast of North America from Mexico to British Columbia.

DIET IN THE WILD: Carnivorous; feeds on zooplankton, small crustaceans, comb jellies, fish eggs and larvae. Sea nettles sting their prey with their tentacles, which have millions of microscopic stinging cells that inject toxins to stun or kill tiny animals. The main oral arms then transport food to the heart-shaped gastric pouches in the bell, where digestion occurs.

PREDATORS: In the medusa stage, sea nettles live from 2–6 mos, usually perishing in rough waters or being eaten by predators— ocean sunfish and leatherback turtles are two of the most prevalent jellyfish predators.

REMARKS: Question: What has no heart, bones, eyes or brain, is made up of 95% water, and yet
is still a remarkably efficient ocean predator? (The jellyfish) Some jellies commute 3,600 feet (1,097 m) up and down in the water column daily!

Sea nettle stings can result in extreme localized pain. Fortunately this jelly is not aggressive.

The bell of this and other jellies is called a “medusa” because, with its long, fringing tentacles, it resembles the snake-haired Gorgon Medusa of Greek mythology.

Venomous, Plankton/Sea Drifters


California Academy of Sciences Steinhart Aquarium 2018

Monterey Bay Aquarium www.montereybayaquarium.org/animal-guide/invertebrates/se…

Rons flickr www.flickr.com/photos/cas_docents/sets/72157610031545571/…

Rons WordPress Shortlist wp.me/p1DZ4b-PM


Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Subclass: Zoantharia
Order: Actiniara (anemones)
Family: Actiniidae

Genus/species: Urticina piscivora

GENERAL CHARACTERISTICS: Large to 20 cm (8 inches) high and 26 cm (10 inches) across. The column is red (without spots) with white. Tentacles are white, and the oral disc is creamy yellow. Normally they do not accumulate debris such as shells and sand.


DISTRIBUTION/HABITAT: Alaska to southern California. Found in low intertidal areas with rocky attachment sites and at least moderate current. Depth to about 50 m (160 feet)


DIET IN THE WILD: Invertebrates, shrimp and small fishes. U. piscivora have no zooxanthellae and depend wholly on capturing their food, a strategy aided by their exceptionally virulent nematocysts (stinging cells), which can cause long-lasting lesions on humans. Food items are usually swept into the central mouth by the tentacles where enzymes digest the food. Non digested items are expelled out through the mouth.


Genus/species: Urticina piscivora3702912695_1708579b2e_b 


REMARKS: One fish species, the painted greenling (Oxylebius pictus), has been observed lying unharmed in this anemone much as clownfish do in tropical anemones. 


California Academy of Sciences Steinhart Aquarium California Coastal Marine Reef Exhibit

eol eol.org/pages/2549643/details

Walla Walla Universitywww.wallawalla.edu/academics/departments/biology/rosario/…

Georgia Aquariumanimalguide.georgiaaquarium.org/home/galleries/cold-water…

Ron’s flickr www.flickr.com/photos/cas_docents/3702912695/in/set-72157…

Ron’s WordPress shortlink http://wp.me/p1DZ4b-1l6

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