Sipuncula - ZOO 115 Invertebrate Zoology Phylum Sipuncula...

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ZOO 115 Invertebrate Zoology Phylum Sipuncula
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Phylum Sipuncula - General Characteristics “Peanut worms” ~ 250 species Similar to Annelids but NO segmentation All marine – mostly shallow water Usually burrow in mud or sand but some crawlers http://www.ucmp.berkeley.edu/sipuncula/sipunculids_big.jpg
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http://bio.classes.ucsc.edu/bio136/sipuncula/sipuncula.html Phylum Sipuncula – Internal Anatomy Spacious coelom Pressure from circular muscles Introvert extended by squeezing body which forces fluid into it and extending it Contraction of introvert retractors while relaxing circular muscles brings introvert back into trunk
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Sipuncula - ZOO 115 Invertebrate Zoology Phylum Sipuncula...

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