Mode of nutrition of spider and starfish

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    • #16596
      WilliamY
      Participant

      What is the mode of nutrition(holozoic, parasitic or saprophytic) of spider and starfish?

    • #111568
      wbla3335
      Participant

      I would say that the spider is saprophitic and the starfish is holozoic.

    • #111579
      plasmodesmata11
      Participant

      why would you say the spider is saprophytic?

    • #111581
      wbla3335
      Participant

      I guess it depends on what definitions one chooses. The term "saprophytic" is not used much anymore but generally refers to the ingestion of dead or decaying organic matter. By this definition, scavengers are saprophytes, which may be one of the reasons why the term is no longer commonly used. Spiders usually either secrete or inject digestive enzymes onto or into their prey and then suck up the digested organic matter. So saprophytic could apply to this mode of nutrition. Holozoic nutrition usually refers to the ingestion of solid organic matter, which spiders tend not to do. Some definitions of holozoic, though, include the ingestion of liquid organic matter, which would apply to spiders.

    • #111582
      plasmodesmata11
      Participant

      Well said. Saprophytic in this context could be rather misleading.

    • #112074
      hymenoptera7
      Participant

      Biologists use the term "sea star" not starfish. It’s an Echinoderm people!

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