Ammocoetes
Ammocoetes (pronunciation: am-mo-coe-tees) is the larval stage of lampreys, a type of jawless fish in the order Petromyzontiformes.
Etymology
The term "Ammocoetes" is derived from the Greek words "ammos" (sand) and "koitos" (bed), referring to the sandy habitats where these larvae are typically found.
Description
Ammocoetes are characterized by their eel-like body shape, lack of paired fins, and a mouth adapted for filter feeding. They have a well-developed notochord, which is a flexible rod-like structure that provides support to the body. The eyes of Ammocoetes are poorly developed and covered by skin, rendering them virtually blind. They also possess seven external gill slits on each side of their body.
Life Cycle
The life cycle of a lamprey begins with the hatching of Ammocoetes from eggs. These larvae then burrow into soft sediments in freshwater habitats, where they live and grow for several years. During this time, they feed by filtering organic particles from the water. After reaching a certain size, Ammocoetes undergo a process called Metamorphosis, transforming into adult lampreys. This stage is marked by significant morphological changes, including the development of eyes, teeth, and a sucking mouth.
Related Terms
- Petromyzontiformes: The order of jawless fish to which lampreys belong.
- Metamorphosis: The process by which Ammocoetes transform into adult lampreys.
- Notochord: A flexible rod-like structure that provides support to the body of Ammocoetes.
See Also
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