Placophoran

Part of speech: noun

Definitions

1. A marine mollusk characterized by a broad, flattened body covered with overlapping calcareous plates, belonging to a class distinct from other mollusks and typically found clinging to rocks
2. An aquatic invertebrate mollusk featuring a dorsal shell made of multiple articulated plates; these organisms form a unique class within mollusks and inhabit marine environments often on hard substrates
3. A sea-dwelling mollusk with a segmented plate-covered shell on its back, belonging to a specialized group distinct from gastropods and bivalves, commonly residing on rocky surfaces in oceans

Etymology: Placophoran is a modern scientific coinage, not an ancient word. It was built in the nineteenth century from Greek elements: "plax" (a flat plate or slab, the root behind "placenta" and "plaque") and "-phoros" (bearing or carrying, from "pherein", to bear). The name describes the animal's most striking feature, the eight overlapping shell plates that run down its back like armour on a flattened body. Its class is called Polyplacophora, meaning "many-plate-bearers," and the chitons are its living members. The name is pure description rather than a myth or a name for a person. Its "-phore" ending is shared with many other scientific terms for organisms or structures that carry something, such as "gonophore" and "siphonophore," a pattern naturalists used freely when naming newly described animals.

Synonyms: chiton