Tag Archive: anemone


TAXONOMY
Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Order: Actiniaria
Family: Stichodactylidae

Genus/species: Heteractis magnifica

GENERAL CHARACTERISTICS: H. magnifica is the second largest in size of all sea anemones. Disc to 1 m (3 ft) in diameter. Column which may be red, purple, or pink, grows to 20 cm (8 in). Tentacles (exceed 8 cm 3 in long) are of uniform thickness and do not taper at te tip; tentacles and oral disc are colored alike in shades of magenta-purple, blue, green , red, white or brown.

 

DISTRIBUTION/HABITAT: Found in the Indo-Pacific at 1–25 m (3-85 ft) often on prominent structures in strong currents or in strong surge locations.

DIET IN THE WILD: Most nutrition is from products of zooxanthellae. Also may eat fish and crustaceans using their stinging nematocysts.

REPRODUCTION: Asexual reproduction by longitudinal fission. The presence of the symbiotic clown fish Amphiprion chrysopterus can increase the amount of asexual reproduction and general growth.
Sexual reproduction, their fertilized eggs develop into a planula larvae which settles on the ocean floor and develops into a polyp.

 

PREDATION: Symbiotic clownfishes, chase away any nibbling predators, especially bristle worms.

LONGEVITY: in the wild. It is estimated that some of these anemones are hundreds of years old. In captivity, the longest lifespan is 80 years.

CONSERVATION: IUCN: Not Evaluated

REMARKS: Host to at least 12 anemonefish species. When disturbed, H. magifica “balls up,”showing only the column with only a few tentacles protruding.
The magnificent anemone is motile when trying to re-position itself to obtain more sunlight. This species moves by creeping on its basal disc, or by letting the tide carry it.
Anemones can be semi-aggressive and sting other anemones that invade their space.

References

California Academy of Sciences Water is Life Animal Attractions 2017

Ron’s flickr https://www.flickr.com/photos/cas_docents/32131406193/in/album-72157629304397467/

Animal Diversity Web animaldiversity.org/accounts/Heteractis_magnifica/

Ron’s WordPress Shortlink  http://wp.me/p1DZ4b-1PJ

 

TAXONOMY
Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Order: Actiniaria
Family: Metridiidae

Genus/species: Metridium senile

GENERAL CHARACTERISTICS: M. senile is colored white, cream, tan, orange or brown. Height to 5 cm (2 inches). Tentacular crown diameter to 25 cm (9.75 inches), Up to one hundred small, slender tentacles give a feathery (plumose) appearance.

 Metridium senile 3074666433_ab584596e9_o

DISTRIBUTION/HABITAT: Southern Alaska to Southern California and both Atlantic coasts. Found live in groups of up to 500 specimens per square meter at depths to 166 m (540 feet). M. senile lives on rocks, shells, wood pilings and stony breakwaters in bays and harbors in the low intertidal and subtidal zones. Plumose anemones crawl slowly along the substrate by muscular waves of the pedal disk.

DIET IN THE WILD: Mostly small zooplankton, though they may also eat small benthic polychaetes, fish, and squid.

REPRODUCTION: Protandric hermaphrodite starting life as one sex and changes to the other when it is older. Eggs or sperm develop in the gonads embedded in the mesentery that lines the coelom. They are ejected through the mouth, and when fertilised develop into planula larvae which settle and become juveniles.

They also reproduce asexually by binary fission, budding and fragmentation.

PREDATORS: Nudibranch Aeolidia papillosa (on small individuals), and the seastars Hippasteria spinosa and Dermasterias imbricata, which can eat even quite large individuals.  Attacked individuals may detach and drift to a new location.

Location: California Rocky Coast and tide pool

References

Walla Walla University: www.wallawalla.edu/academics/departments/biology/rosario/…

eol  eol.org/pages/421495/details 

Ron’s flickr   https://www.flickr.com/photos/cas_docents/3074666433/in/set-72157625127345346/

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

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