One of the mysteries of the English language finally explained.
A slender transparent wormlike animal with fins, having spines on the head for grasping prey. It is common in marine plankton.
Phylum ChaetognathaAlso called chaetognath
- ‘Early Cambrian ‘protoconodonts’ are currently believed to be the unrelated remains of chaetognaths (or ‘arrow worms’).’
- ‘As mentioned, the chaetognaths (‘arrow worms’) are clearly orthodox bilaterians.’
- ‘Chaetognaths (‘arrow worms’) were considered to be deuterostomes until quite recently, when they were relocated to the protostomes.’
- ‘Chaetognaths, commonly called arrow worms, were considered deuterostomes based on their tripartite coelom and the retention of the blastopore to form the anus.’
- ‘Chaetognaths (commonly named arrow worms) are transparent marine metazoans, ranging in size from 2 to 120 mm.’
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