#polychaete
- Amphinomid — A niche representative of the marine polychaete worm family Amphinomidae, also known as 'fireworms' due to their sharp, brittle calcareous bristles (chaetae) that secrete an irritating toxin. As a proper noun (Amfinom), it represents the Romanianized form of the Greek mythological name Amphinomus, one of Penelope's suitors in Homer's Odyssey, ultimately killed by Telemachus.
- Amphitrite — An ancient proper noun designating the goddess of the sea in Greek mythology, a prominent Nereid who became the wife of Poseidon and queen of the oceans; in astronomy, the term represents the S-type asteroid number 29 (29 Amphitrite), one of the largest celestial bodies in the main belt; in biology, it designates a genus of marine polychaete worms that live in sedimentary tubes.
- Aphrodita — A genus of marine polychaete worms within the family Aphroditidae, distributed across the sandy or muddy bottoms of the Atlantic and Pacific Oceans, as well as the Mediterranean Sea. The most well-known representative is Aphrodita aculeata (the sea mouse), an organism remarkable for its body covered in long, silky bristles that exhibit a spectacular phenomenon of structural photonic iridescence under light.