frontoclypeus

plural frontoclypei

1. biologyThe line (sulcus or suture) between the combined clypeus and frons which is not externally visible.

   [...] frontoclypeus depressed with weak median distal carina, not produced ventrally in profile; rostrum extended to hind coxae.

   2008, C. H. Dietrich, “Some Remarkable New Neotropical Treehoppers (Hemiptera: Cicadomorpha: Membracidae)”, in Zootaxa, page 33

   2 more examples

   The ventral edges of the genae lie at the level of the mouth in the generalized head but the frontoclypeus projects ventrally beyond the level of the mouth and is usually divided transversely by the frontoclypeal suture into a dorsal or postoral frons and a ventral or preoral clypeus (Figure 6b).

   1959, Ernest Melville DuPorte, Manual of Insect Morphology, Chapman & Hall, page 95

   Schuster and Etnier distinguished H. piatrix larvae by the presence of large spinelike setae on the venter of the anal prolegs, and several species of the scalaris group by the presence of bristlelike setae on the frontoclypeus.

   1986, Patricia W. Schefter, Glenn B. Wiggins, A Systematic Study of the Nearctic Larvae of the Hydropsyche morosa Group (Trichoptera: Hydropsychidae), Toronto: Royal Ontario Museum, page 9