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    • #13143
      ManBearPig89
      Participant

      Hi!

      Im working on my zoology- paper and got this question regarding bivalvia, and i can’t find a solution to the problem. The function of the originall gill, or umh, the "pre -gill" if you like.

      I know that apart from the uptake of 02/ descretion of gases, the gills also work as a mecanism to trap food.

      I don’t know if this might be the function of the "pre- gill", or if it’s something else. I considerd the function might have something to do with "cleaning", but I can’t think of anything else right now.

      Thoughts?

    • #99145
      Darby
      Participant

      So what might be the ancestor of the bivalves – would it have most likely used a gill for one or the other of those functions?

    • #99178
      ManBearPig89
      Participant

      I red on wikipedia that it was difficult to pinpoint the ancestor of bivalvia do to big gaps in the foissil record.
      Later, i red (here http://www.sciencemag.org/cgi/content/a … 6/4161/311) that some molluscan might be filter- feeders in early cambrian.

      Do you think the filers later would develop into gills? I think it might be possible, given the "filer like" strukture of gills…

    • #99192
      Darby
      Participant

      Well, would it be easier to be a surface feeder with gills for respiration, or a filter feeder with no way to breathe?

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