Cyclostomata

Part of speech: noun

Definitions

1. A superclass of jawless fish characterized by a circular, sucking mouth and lacking paired fins; comprising lampreys and hagfish; distinguished by their unique feeding mechanism and cartilaginous skeleton
2. Marine and freshwater vertebrates without jaws, possessing round mouths adapted for parasitic or scavenging lifestyles; including species such as lampreys and hagfish; marked by absence of true bones and paired appendages
3. A group of primitive, jawless aquatic animals recognized for their funnel-shaped mouths used for attachment and feeding; encompassing lampreys and hagfish; noted for their simple cartilage-based body structure and external gill openings

Etymology: Cyclostomata is a New Latin coinage built from two Greek roots: "kyklos" meaning "circle" or "ring," and "stoma" meaning "mouth." The name describes the round, sucking mouth that lampreys and hagfish share, though hagfish are actually a distinct group within the class and the mouth is not identical in both. The term was created by scientists writing in Latin, not by ancient Greek speakers, so it reflects classical vocabulary applied to a modern classification. Because these animals lack jaws, they were set apart from the jawed vertebrates, and the name marks that divide by emphasizing the mouth rather than the teeth or jaw structure that define most fish.

Synonyms: jawless fish, lamprey, hagfish