How to use Mouth-parts in a sentence
According to Hinds they feed chiefly on the green tissues, which " are punctured by the piercing mouth-parts and the sap withdrawn by suction.
The structure of the mouth-parts is different from that seen in any other insects.
It is now held that the parasite enters the blood of man through the piercing mouth-parts at the time of biting.
The mouth parts are well developed, consisting of an upper lip, powerful mandibles, maxillae with three-jointed palpi, and a deeply quadrifid labium or lower lip with three-jointed labial palpi.
The term "biting-lice" is sometimes given to these parasites, in allusion to the mandibulate character of their mouth-parts, which serves to distinguish them at once from the true lice of the order Rhynchota in which the jaws are haustellate.Advertisement
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.
The females are always wingless, but are provided with antennae, legs and well-developed mouth-parts.
The mouth parts consist of two small retractile mandibles, of a pair of short palpi and of the toothed probe above mentioned.
The head is smaller, often occupied almost entirely above in the male by the very large eyes, which in some species are curiously double in that sex, one portion being pillared, and forming what is termed a "turban," the mouth parts are aborted, for the creature is now incapable of taking nutriment either solid or fluid; the antennae are mere short bristles, consisting of two rather large basal joints and a multi-articulate thread.
The males, on the contrary, although sometimes wingless, are, as a rule, provided with a pair of large forewings and greatly reduced hindwings; their antennae and legs are longer than in the other sex, but the mouth-parts are reduced and functionless (see Economic Entomology).Advertisement