endognath

From endo- +‎ -gnath (“jaw”).^[1]

endognath (plural endognaths)

1. (zoology) The inner or principal series of oral appendages of crustaceans.
   • 1908, Walter Holbrook Gaskell, The Origin of Vertebrates:

     the cheliceræ, and the four pairs of endognaths dwindled away and became insignificant, leaving as trace of their former presence the descending root of the Vth nerve

• endognathal

• maxilla

• “endognath”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• “endognath, n.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.