Chaetognatha
Chaetognatha
Chaetognatha (pronounced: keɪtɒɡˈnæθə), also known as arrow worms, is a phylum of predatory marine worms that are a major component of plankton worldwide.
Etymology
The term "Chaetognatha" is derived from the Greek words "chaite" meaning "long flowing hair" and "gnathos" meaning "jaw". This refers to the long, bristle-like structures that are found on the sides of the head of these creatures, which they use for capturing prey.
Anatomy
Chaetognatha are characterized by a transparent, torpedo-shaped body, with a head that contains a pair of large compound eyes, and a pair of lateral fins that run along the length of the body. The mouth is surrounded by sharp, recurved teeth which are used for capturing prey.
Habitat and Distribution
Chaetognatha are found in all the world's oceans, from the surface to the deep sea. They are particularly abundant in the open ocean, especially in tropical and subtropical regions.
Diet and Predation
Chaetognatha are carnivorous, feeding primarily on small planktonic animals. They are also known to be cannibalistic, often consuming other members of their own species.
Reproduction
Chaetognatha are hermaphroditic, with each individual possessing both male and female reproductive organs. They reproduce through a process known as broadcast spawning, where eggs and sperm are released into the water column.
Related Terms
- Phylum: A taxonomic rank below Kingdom and above Class.
- Plankton: The small and microscopic organisms drifting or floating in the sea or fresh water.
- Compound eyes: A visual organ found in certain arthropods such as insects and crustaceans.
- Hermaphroditic: An organism that has complete or partial reproductive organs and produces gametes normally associated with both male and female sexes.
External links
- Medical encyclopedia article on Chaetognatha
- Wikipedia's article - Chaetognatha
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