Elasmobranch
Elasmobranch
Elasmobranch (pronounced: /ɪˈlæzməˌbræŋk/) is a term used to describe a group of cartilaginous fish, including sharks, rays, and skates. The term is derived from the Greek words "elasmos" meaning "plate" and "branchia" meaning "gills", referring to the gill slits that are a characteristic feature of these animals.
Etymology
The term "Elasmobranch" comes from the Greek words "elasmos" (meaning "plate") and "branchia" (meaning "gills"). This refers to the gill slits that are a characteristic feature of these animals.
Characteristics
Elasmobranchs are characterized by their cartilaginous skeletons, as opposed to the bony skeletons of other fish. They also have five to seven gill slits on each side of their bodies, and most species have a spiracle, a small opening behind each eye that is used for respiration.
Classification
Elasmobranchs belong to the class Chondrichthyes, which also includes the Holocephali, a group of cartilaginous fish that includes the chimaeras. The class Chondrichthyes is divided into two subclasses: Elasmobranchii and Holocephalii. The subclass Elasmobranchii is further divided into two orders: Carcharhiniformes (the ground sharks) and Rajiformes (the rays and skates).
Related Terms
- Chondrichthyes: The class of cartilaginous fish that includes the elasmobranchs and the holocephalans.
- Holocephali: A group of cartilaginous fish that includes the chimaeras.
- Carcharhiniformes: An order of elasmobranchs that includes the ground sharks.
- Rajiformes: An order of elasmobranchs that includes the rays and skates.
External links
- Medical encyclopedia article on Elasmobranch
- Wikipedia's article - Elasmobranch
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