archinephros
the primitive kidney extending the whole length of the body cavity. Found only in embryonic Myxini

Dictionary of ichthyology. 2009.

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  • archinephros — ▪ anatomy       ancestral vertebrate kidney, retained by larvae of hagfish and of some caecilians and occurring in the embryos of higher animals. Two tubes, the archinephric, or Wolffian (Wolffian duct), ducts, extend between the body cavity and… …   Universalium

  • excretion — excretion1 /ik skree sheuhn/, n. 1. the act of excreting. 2. the substance excreted, as urine or sweat, or certain plant products. [1595 1605; < LL excretion (s. of excretio) that which is sifted out. See EXCRETE, ION] excretion2 /ik skree… …   Universalium

  • kidney — an organ of excretion and osmoregulation. See also nephridia, archinephros, pronephros and mesonephros …   Dictionary of ichthyology

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