Phylum Peanut Worm

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by daisylove2010
Last updated 6 years ago

Discipline:
Science
Subject:
Biology

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Phylum Peanut Worm

Peanut WormPhylum Sipuncula(fiy-lum siy-pun-cula)

Who? and Close Relatives

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Method

What did we do?

Reproduction

They have separate genders, releasing eggs and sperm simultaneously into the water for external fertilisation. Some have a free-swimming larval stage that can travel long distances. In others, the eggs develop directly into little peanut worms. ................................................................................................................................................................................................................................................................................................

The body consists of a cylindrical trunk and an introvert that is completely inside the trunk. The mouth is located at the tip of the introvert and may be surrounded by tentacles. The position of the anus in the antero-dorsal region of the trunk is an easily seen external character that distinguishes the sipunculans from other worm-like invertebrates. Close relatives consist of: Golfingiidae,Phascolionidae, Themistidae.

Fishermen in various parts of the world use sipunculan worms, mostly the larger sand-dwelling species, as bait. In Java, in the western Carolines, and in some parts of China, sipunculans are eaten by the locals.

Lives in crevices or burrows into dead coral or soft rock. Diet includes detritus, most of them mopping it up from the surface. They have branched tentacles used for filter feeding.Behavior, most species retract their tentacles and introvert quickly following a tactile stimulus.

Importance

Habitat, Diet, Behavior


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