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Giant Acorn Worm is an undiscovered marine invertebrate of the Eastern North Atlantic and North Pacific Oceans. Adult Acorn worms (Class Enteropneusta) of the type Planctosphaera pelagica have never been observed. The larvae (tornariae) are larger than those of other hemichordates, and if the size ratio is the same as in other species, the adults could grow to 9 feet long. The larvae are large, transparent spheres with arborescently branched, ciliated feeding bands and a U-shaped alimentary tract. Habitat: Oceanic mud at depths of 250– 1,660 feet.

Possible Explanation

  • The larvae may be the abnormally enlarged tornariae of another family of Acorn worms (Ptychoderidae) that fail to metamorphose into adults. They could be mutations of acorn worms that were exposed to too much pollution.
  • It could be a new species of acorn worm.

A regular acorn worm

Leyak by scythemantis-d5p0ya5.png "As unpredictable—and probably just as controversial—as UFOs, Leyak are a supernatural phenomenon most feared by many Indonesians."

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