#cnidaria

• Actinamea — Romanian name adapted from the taxonomic genus Actinamea, representing a category of microscopic or meiofaunal marine organisms within the phylum Cnidaria or related to sea anemones. These possess a simple structural body, often adapted to interstitial life inside sandy sediments, and are characterized by tentacles symmetrically arranged around the oral disc, resembling a star or a ray.
• Sea anemone — A popular or archaic transcription form of the term 'actinie' (genus Actinia); a class of macroscopic marine coelenterates in the phylum Cnidaria, commonly known as sea anemones. Their structural body is cylindrical, soft, and fleshy, attached to rocky substrates via a pedal disc, and at the upper extremity features a crown of stinging tentacles arranged radially, used for capturing prey.
• Actinians — Plural form for the masculine noun 'actiniu' (in a zoological context, variant for actinia/sea anemone) or utilized taxonomically to designate a structural group of marine coelenterates from the Anthozoa class. These benthic polypoid organisms possess a fleshy body and a radiant crown of peri-oral tentacles equipped with cnidocytes, being widespread on sea and ocean floors where they often live solitarily fixed to rocks.
• Sea anemone — A class of macroscopic marine coelenterates within the phylum Cnidaria, order Actiniaria, universally known as sea anemones. Their structural body is cylindrical, soft, fleshy, and completely lacks a calcareous skeleton, being anchored to rocky substrates or shells via a muscular pedal disc, while the upper extremity features a central mouth surrounded by concentric crowns of retractile and stinging tentacles used for prey capture and defense.
• Sea anemone — A solitary marine polyp of the Anthozoa class, Actiniaria order, characterized by a cylindrical, soft, and muscular body attached to the substrate by a pedal disc, and a crown of stinging tentacles around the mouth opening. These predatory organisms use nematocyst cells to paralyze small prey and often live in symbiotic relationships with various species of fish or crabs.
• Anthozoa — A class of marine invertebrates within the phylum Cnidaria that includes stone corals, sea anemones, soft corals, and sea fans, characterized by the complete absence of a medusa stage in their life cycle, existing exclusively as polyps.
• Anthozoan — A marine invertebrate belonging to the class Anthozoa, phylum Cnidaria, living exclusively in the form of a solitary or colonial polyp fixed onto a solid substrate (such as corals and sea anemones), completely lacking the free medusa stage. This organism possesses a cylindrical body whose oral opening is structurally surrounded by tentacles equipped with cnidocytes, being the primary builder of barrier reefs through the secretion of a hard calcareous exoskeleton.