Illustrated Glossary of Sea Anemone Anatomy - Oral Disk

This page features images of sea anemone oral disks. The often colorful oral disk is located at one end of the anemone, and has a central mouth surrounded by numerous tentacles.

Discosoma haddoni. Segments of the disks, representing about one-sixth only of their entire superficial areas in two diversely coloured polyps, are here delineated. Isolated tentacles with their inflated apices are represented in lateral view, (thus showing their columnar stalks) near the top and bottom margins of the plate. The fish, Amphiprion bicinctus, in this illustration (having only two white bands) is a commensal with Discosoma haddoni. The prawn, Palaemon sp., in the right-hand upper corner, also lives commensally within the body-cavity of this anemone, only, however, in individuals that are not tenanted by the fish.


Oral disc of Aulactinia incubans. Note that white lines over directive endocoels cross oral cone whereas others do not; planulae or juveniles (arrows) inside tentacles.
Phellia abyssicola, seen from above.
Hoplophoria coralligens. Oral view of the living animal. The part n.b. of the stinging organ is the battery of nettle cells.
View of expanded disk and tentacles from a living specimen of Urticina columbiana.
Oral disk of Anemonia depressa.
Cryptodendrum adhesivum.
Paractinostola bulbosa von der Mundseite.
The stinging anemone Megalactis griffithsi, long-armed variety.
Paractis alba. Von oben, die Tentakelscheibe halb eingestülpt.
Heterodactyla hypnoides, expanded polyp with pinnatified tentacles.
Siphonactinia boeckii. a. tentacles. b. the tube. c. longitudinal split. d. the collar.
Giant anemone, Discosoma sp.
Rhodactis howesii, oral area with surrounding, simply capitate tentacles.
Actinia pinoti. Oral disk and tentacles of the variety found in valuable corals.

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