haustellate

Among the so-called haustellate insects the mouth-parts vary so much in different groups, and such different organs separately or combined perform the function of sucking, that the term haustellate loses its significance and even misleads the student.

Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses 1872

Neolepidoptera: all haustellate Lepidoptera, except the generalized

Explanation of Terms Used in Entomology John. B. Smith

Paleolepidoptera: haustellate Lepidoptera in which the mandibles are distinct and the pupa is free: includes the Micropterygidae only: see protolepidoptera and neolepidoptera.

Explanation of Terms Used in Entomology John. B. Smith

Diptera: an ordinal term applied to insects having only one pair of wings (anterior): thorax agglutinate; mouth haustellate; transformations complete.

Explanation of Terms Used in Entomology John. B. Smith

Instrumenta suctoria: mouth parts of a haustellate insect as a whole.

Explanation of Terms Used in Entomology John. B. Smith

Lepidoptera: scale-winged: an order of insects with spirally coiled haustellate mouth structures; head free; thorax agglutinate; transformations complete four scale-covered wings.

Explanation of Terms Used in Entomology John. B. Smith

Apart from this feature the Trichoptera also differ from the typical Neuroptera in the relatively simple, mostly longitudinal neuration of the wings, the absence or obsolescence of the mandibles and the semi-haustellate nature of the rest of the mouth-parts.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

The older entomologists divided insects into haustellate or suctorial, and mandibulate or biting insects, the butterfly being an example of one, and the beetle serving to illustrate the other category.

Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses 1872

Another puzzle for the evolutionist to solve is how to account for the change from the caterpillar with its powerful jaws, to the butterfly with its sucking or haustellate mouth-parts.

Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses 1872

I think that this gradual degradation of the mouth-parts in this group indicates that the appendages in these animals are not formed on an independent type, intermediate, so to speak, between the mandibulate and haustellate types, but are simply a modification (through disuse) of the mandibulate type as seen in Neuropterous insects.] [Footnote 12: Lubbock considers that Papirius should be placed in a distinct family from Smynthurus, because it wants tracheæ.

Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses 1872