Other Free Encyclopedias » Animal Life Resource » Jellyfish, Sponges, and Other Simple Animals » Acoels: Acoela - Physical Characteristics, Behavior And Reproduction, No Common Name (convolutriloba Longifissura): Species Account - GEOGRAPHIC RANGE, HABITAT, DIET, ACOELS AND PEOPLE, CONSERVATION STATUS

Acoels: Acoela - Physical Characteristics

body system animals simple

Acoels (AY-seels) are tiny wormlike sea animals. They are the simplest animals with bilateral symmetry (bye-LAT-er-uhl SIH-muh-tree), meaning the right and left halves of the body match each other. Most acoels are no longer than about one-sixteenth of an inch (2 millimeters), although one species can reach a length of about five-eighths inch (15 millimeters). The bodies of acoels are flat ovals.

Acoels have either a simple mouth or none at all. The mouth is on the bottom of the animal. Acoels have no digestive tract, no system for eliminating waste or balancing salt content in their cells, and no reproductive organs. The nervous system is a loose net of fibers strung throughout the body. Most acoels have simple eyes. Almost all acoels have an organ for balance and for adjusting themselves to their surroundings.


Acoels: Acoela - Behavior And Reproduction [next]

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