gnathite vs proboscis

gnathite

noun
  • Any of the mouth appendages of the Arthropoda. 

proboscis

noun
  • The tubular feeding and sucking organ of certain invertebrates like insects, worms and molluscs. 

  • The trunk of an elephant. 

  • A large or lengthy human nose. 

How often have the words gnathite and proboscis occurred in a corpus of books? (source: Google Ngram Viewer )