#biological classification

• Adenophora — A genus of perennial herbaceous plants in the family Campanulaceae, primarily native to temperate regions of Eurasia, commonly known as ladybells. Their primary structural characteristic is the presence of a cylindrical or tubular glandular nectar disc surrounding the base of the style, with flowers typically being blue or violet, hanging in racemes or panicles.
• Amanita — A genus of white-spored mushrooms within the order Agaricales, which includes some of the most well-known species worldwide, comprising both high-quality edible mushrooms and highly toxic, often deadly species. In common language, the term describes specimens characterized by a volva at the base of the stalk and a membranous ring around it.
• Amathusia — A genus of large butterflies within the Nymphalidae family (subfamily Morphinae), native to the tropical regions of Southeast Asia, commonly known as palmkings. They feature large wings with cryptic undersides mimicking dead leaves.
• Amaurolepis — A rare taxonomic designation or specific epithet used in systematic biology and paleontology to describe an organism, fossil taxon, or anatomical structure characterized by dark, opaque, or brownish scales (from Greek amauros - dark, and lepis - scale).
• Amplexifoliate — Regarding plants or vegetable formations: having amplexicaul leaves whose bases embrace, surround, or tightly clasp the stem. This structural descriptive term is utilized in advanced plant morphology to define the state of a shoot or stem entirely covered by foliage adapted to wrap circularly around the central axis, offering optimal insulation to growth nodes.
• Ampulliform — Having the shape of an ampoule or a small vial; swollen at the base or in the central portion and structurally narrowed toward the extremities. This descriptive term is frequently utilized in botany to characterize the shape of certain flowers, plant cups, or glandular hairs, as well as in anatomy to specify the profile of dilated biological ducts.
• Antigone — A secondary scientific name or taxonomic usage (currently classified often within the genus Antigone) attributed to a species of large birds from the crane family (Gruidae), such as the sarus crane (Antigone antigone), native to South Asia and Australia.
• Ariopsis — A genus of marine and brackish water catfishes in the family Ariidae (sea catfishes), distributed in the tropical and subtropical waters of the Americas; it also denotes a genus of perennial herbaceous plants in the family Araceae, native to tropical Asia, characterized by distinctive inflorescences protected by a spathe.
• Astaciform — Having the shape, appearance, or anatomical structure resembling that of a crayfish (of the genus Astacus); a morphological adjective used in biology to describe the exterior appearance of certain fossil or contemporary crustaceans presenting a robust cephalothorax, segmented abdomen, and prominent claws.