(Macrosphenidae; Ϯ Yellow Longbill M. flavicans) Gr. μακρος makros  long; σφην sphēn, σφηνος sphēnos  wedge; "Genus MACROSPHENUS, nobis.  General aspect of Orthotomus (O. sericeus, Temm.) and Ramphocænus (R. melanurus, Vieill.) but with the bill stronger, wider laterally and more compressed, and with the legs and feet stronger. Bill long, rather strong, straight, wide at base, compressed towards the end, upper mandible carinated, curved and distinctly notched at the tip, nostrils in a large membrane, under mandible rather thick, somewhat curved in its outline, ascending towards its tip.  ...  This genus, which I propose for the species immediately succeeding, is exactly that of a bird in the Rivoli collection now in the Museum of this Academy, labelled "Ramphocene vert, Ramphocenus viridis, Madagascar."  ...   This bird may be Ramphocænus viridis, Lesson, Traite d'Orn., p. 377, but which is stated by M. Lesson to be a species of Brazil.   ...   70. MACROSPHENUS FLAVICANS, nobis.  ...  Hab. Camma River, Western Africa. Discovered by Mr. P. B. Duchaillu.  The affinities of this bird, and that alluded to above, as probably from Madagascar, I have not satisfactorily determined. The general aspect is that of Orthotomus and Ramphocænus, as stated above, but they appear also to be related to Tatare, Lesson, and in fact have the bills very similar to that of Tatare luscinius or Thryothorus luscinius, Quoy et Gaim. Voy. Astrolabe, Ois. pl. 5. At present my opinion is that they belong to the group Troglodytinæ." (Cassin 1859).
Synon. Onychorhinus, Rectirostrum, Suaheliornis.

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2019). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2019). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 19 January 2019).