👉 Ichthyonomy is a biological classification system that divides invertebrates into various classes based on their physical characteristics, such as body shape, size, and color. The classification system was developed by Carl Linnaeus in the 18th century to help classify living organisms and categorize them into groups of similar species. It has been extensively used for identifying and classifying marine and freshwater animals, including fish, crustaceans, octopuses, and squid.