''Radianthus doreensis'', also known as long tentacle anemone and corkscrew tentacle sea anemone, is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

sea anemone Sea anemones ( ) are a group of predation, predatory marine invertebrates constituting the order (biology), order Actiniaria. Because of their colourful appearance, they are named after the ''Anemone'', a terrestrial flowering plant. Sea anemone ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Stichodactylidae Stichodactylidae is a family of sea anemones that contains the genera '' Stichodactyla'' (carpet anemones) and '' Radianthus''. These species reside exclusively within the shallow waters of the tropical Indo-Pacific area and are in the main famil ...

Description

''Radianthus doreensis'' has relatively few tentacles. They are all similar to one another in size and colour, being purplish-gray to brown. Each grows to about 1.75 inches, are sinuous, and each taper evenly toward the tip. In some cases they have a corkscrew shape. The oral disc is normally purplish-gray to brown, and sometimes has a green cast. It has a flared shape, and grows to a maximum of 5 cm wide, but is often far smaller. It has white lines that are oriented radially, sometimes extending onto the tentacles. This species remains at the surface of the sediment, with the column buried. The lower portion of the column is a dull orange to bright red colour, with the upper portion being brownish, containing a round to ovoid verrucae in rows oriented longitudinally.

Distribution and habitat

This species is found in Japan, and south to the waters of

New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...

and northern Australia. This species is commonly found at depths of 5 metres or less in muddy bottoms, and is commonly seen without fish present.

Behaviour

The tentacles of ''Radianthus doreensis'' may either shrivel, or stick to the hand of a person who disturbs it. This anemone can retract entirely into the sediment.

Symbionts

''R. doreensis'' is a host of 5 different species of fish. * ''

Amphiprion chrysopterus The orange-fin anemonefish (''Amphiprion chrysopterus'') is a marine fish belonging to the family Pomacentridae, the clownfishes and damselfishes, found in the Western Pacific north of the Great Barrier Reef from the surface to 20 m, to inclu ...

'' orange-fin anemonefish * ''A. clarkii'', the yellowtail anemonefish * ''A. ocellaris'' Western clownfish * ''A. perideraion'' pink skunk anemonefish. * ''

Dascyllus trimaculatus The threespot dascyllus (''Dascyllus trimaculatus''), also known as the domino damsel or simply domino, is a species of damselfish from the family Pomacentridae. It is native to the Indo-Pacific from the Red Sea and East Africa, to the Pitcairn Is ...

'' 3 spot dascyllus.

Notes

References

External links

* {{Taxonbar, from=Q630919 Actiniidae Animals described in 1833 Taxa named by Jean René Constant Quoy Taxa named by Joseph Paul Gaimard Cnidarians of the Pacific Ocean