Keywords: Pseudoniscus aculeatus Origin of Vertebrates.png Extract from Fig 5 Pseudoniscus aculeatus extracted from Origin of Vertebrates Fig 005 png 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Pseudoniscus |