arrowworm


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Related to arrowworm: acorn worm

arrowworm:

see ChaetognathaChaetognatha
, phylum of predominantly pelagic marine animals commonly known as arrowworms. Arrowworms have slender, transparent bodies, usually under 1 in. (2.5 cm) long. Lateral and caudal fins propel the animal in sudden darting movements.
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arrowworm

[′ar·ō‚wərm]
(invertebrate zoology)
Any member of the phylum Chaetognatha; useful indicator organism for identifying displaced masses of water.
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