Sipuncula
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The Sipuncula or Sipunculida is a class containing about 162 species of marine annelid worms, that have secondarily lost their segmentation. Sipuncula was once considered a phylum of unsegmented worms
Thysanocardia nigra
Sipunculus nudus
Lecthaylus gregarius, a sipunculan from the Silurian of Illinois
A plate of Sipunculid worm jelly
Sipunculus nudus
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Sipunculus nudus is a cosmopolitan species of unsegmented marine worm of the class Sipuncula, also known as peanut worms.
Sipuncula
…siphunculus ("little tube"), a diminutive of sipho from Greek σίφων (síphōn, "tube, pipe"). The Swedish naturalist Carl Linnaeus first described the worm Sipunculus nudus in his Systema Naturae in 1767. In 1814, the French zoologist Constantine Samuel Rafinesque used the word "Sipuncula" to describe the family (now…
Sipunculus nudus in Pula, Croatia
Sipunculus nudus (front end) in Pula, Croatia
Sipunculus nudus (body texture) in Pula, Croatia