CEPHALOCHORD Meaning and
Definition
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A cephalochord is a taxonomic group belonging to the phylum Chordata, characterized by a unique anatomical structure and specific biological features. Cephalochords are small, marine invertebrates also known as lancelets or amphioxus. They typically inhabit shallow coastal regions and are prevalent in tropical and subtropical waters worldwide.
The distinguishing characteristic of cephalochords is their notochord, a flexible, rod-like structure running along the length of their body. This notochord provides support and allows for movement. Cephalochords lack a true backbone, although the notochord represents an early stage in the evolution of vertebral columns.
Another defining trait of cephalochords is their segmented musculature, enhancing locomotion and providing a basis for the evolutionary development of muscles in more advanced chordates. Additionally, cephalochords possess a primitive nervous system, with a nerve cord that runs beneath the notochord.
Cephalochords are filter feeders, relying on a mechanism known as pharyngeal pumping to draw in water through their mouth and expel it through their gill slits. They primarily feed on plankton and other small organisms suspended in the water column.
These curious creatures typically burrow into soft sediments, leaving only their anterior end exposed. They tend to live a solitary existence, but sometimes form small groups or colonies. Cephalochords play an important role in marine ecosystems, as they serve as a food source for various predators and contribute to nutrient cycling. Their significance also extends to scientific research, as they are considered a valuable model organism for studying chordate evolution and developmental biology.
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The cephalic portion of the chorda dorsalis in the embryo.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for CEPHALOCHORD
- cephalochozd
- cephalochovd
- cephalochopd
- cephalochosd
- cephalochort
- cephalochorl
- cephalocored
- cephalowchord
- cephalockord
- cephalochoard
- c ephalochord
- ceph alochord
- cepha lochord
- cephal ochord
- cephalo chord
- cephaloc hord
- cephaloch ord
- cephalocho rd
- cephalochor d
Etymology of CEPHALOCHORD
The word "cephalochord" is derived from two Greek roots: "cephalo" meaning "head" and "chord" meaning "cord" or "string". The term refers to a group of invertebrate animals called cephalochordates, which possess a notochord (a flexible rod-like structure) extending throughout the length of their body, particularly the head region. These species are also commonly known as lancelets or amphioxus.
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