Cephalodiscus+gracilis

=Pterobranch =

For food, they usually eat small planktonic plants and animals, from the surrounding water.
==__Life Cycle:__ Pterobranchs are dioecious, with the fertilised egg hatching to produce a free-swimming ciliated larva. Despite the close relationship between the two groups, the larva does not resemble that of the acorn worms. Eventually, the larva settles onto the substrate, and reproduces asexually by budding to create a new colony. == == __Male/Female Differences:__ They are hemaphrodites, so they are male and female.They have both male and female reproductive parts. == ==__Interesting Facts:__ They live in secreted tubes that are organized into a colonial structure called a coenecium. The U-shaped alimentary tract of Cephalodiscus is of exclusively epithelial structure; on the basis of fine structural criteria the entire tract can be divided into two large subdivisions ==

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