Haustellum n. : The sucking proboscis of various insects. See Lepidoptera, and Diptera.

Example:
where would a Dye Murex (Haustellum brandaris) be found?

Taxonomy
Haustellum brandaris, species, shell, dye, murex, Murex brandaris, free encyclopedia, family, Muricidae, snails, spiny, Murex shells, rock, Martin, mollusk species, species lives, growth stages, Bolinus brandaris.

Defination from the web:
Haustellum brandaris, also known as Bolinus brandaris or Murex brandaris, and commonly known as the purple dye murex or the spiny dye-murex is a ... A shell of Haustellum brandaris: this particular shell has a broken lip because it was between growth stages when it died, and the edge of the ...