The Collaborative International Dictionary of English v.0.48:

Fissilinguia \Fis`si*lin"gui*a\, n. pl. [NL., fr. L. fissus (p.
   p. o f findere to split) + lingua tongue.] (Zool.)
   A group of Lacertilia having the tongue forked, including the
   common lizards. [Written also Fissilingues.]
   [1913 Webster]