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Hawaiian Worms
FEBRUARY 2007
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 Ptychodera flava, up to 15 in (38 cm)
Nosy Acorn
Photograph by Darlyne A. Murawski
More complex than a flatworm, an acorn worm uses its smooth proboscis to nose through sand, sieving nutrients from the sediments. It has a liver (the nubs along its body) and gill slits like those of sharks—and embryonic humans. Its noxious skin puts off predators, and its head (collared section) can regenerate in days if severed.
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