found: Work cat: Antosca, S. Tessera, 2016:prefatory material (clarinetist doubles on a Mexican tlapitzalli, a clay 5-hole flute with an opening on the underside for the thumb)
found: Grove music online, September 11, 2018:Huilacapitztli (The tlapitzalli is an Aztec end-blown flute, usually made of clay but sometimes of wood or bone. It is found in various shapes (straight, curved, Y-shape) and sizes from 15 to 35 cm long. The proximal end has a duct mouthpiece and the distal end is often flared. It can have up to four bores which can be blown together or separately)
found: Sturman, J. Course of Mexican music, 2015:page 41 (tlapizalli, clay duct flutes, may have multiple chambers or pipes)