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Cycliophora

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This phylum's 'place' relative to other phyla: Metazoan Triploblast *Uncertain affiliation????????*	Selected taxa within this taxon: (you are not responsible for any classes in this phylum)

1 species Symbion pandora

Characteristics

small (<0.5 mm) found exclusively on the mouthparts of lobsters

ring of cilia around mouth and terminal adhesive disc. Feeding apparatus and brain periodically degenerate and are replaced by budding!

U-shaped intestine

Thin cuticle

Complex life cycle involved in dealing with life as an ectoparasite ofn a molting host (see book)

Phylogeny

Entoprocta and Bryozoa affiliation Why?

Rotifera affiliation - Comparisons of 18S rDNA suggest that Symbion is in the major invertebrate clade containing the rotifers, trochophores, and lophophorates and is closer to Rotifera than to Entoprocta or Ectoprocta. Morphological evidence supports rotifer affiliation and includes degenerate males, hypodermic injection of sperm into females, and multiciliated epithelial cells

Lecture Sources:

Pechenik. Jan A. 2000. Biology of the Invertebrates. McGraw-Hill, New York.

http://www.ucmp.berkeley.edu/help/taxaform.html University of California Museum of Paleontology.

http://www.teaching-biomed.man.ac.uk/bs1999/bs146/biodiversity/metadiv.htm Graham Davison University of Manchester SCHOOL OF BIOLOGICAL SCIENCES.

http://www-biol.paisley.ac.uk/courses/Tatner/biomedia/home/home.htm Glasgow University Zoology Museum

http://biodidac.bio.uottawa.ca/ BIODIDAC:A bank of digital resources for teaching biology

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