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The upper and lower parts of the thorax (terga and sterna respectively) are composed of segmental and intrasegmental sclerites which display secondary sclerotisation and considerable modification in the Lepidoptera. The prothorax is the simplest and smallest of the three segments while the mesothorax is the most developed. [27]
Rather than being tooth-like, the mandibles of such insects are lengthened into stylets, which form the outer two parts of the feeding tube, or beak. The mandibles are therefore instrumental in piercing the plant or animal tissues upon which these insects feed, and in helping draw up fluids to the insect's mouth.
You can see in the above clip the way the animal wraps its tongue around the twigs, drawing the leaves into its mouth. The elongated shape of its head also helps to extend its reach.
[8]: 16 [23] The labrum is a simple, fused sclerite, often called the upper lip, and moves longitudinally. It is hinged to the clypeus. It is hinged to the clypeus. The mandibles (jaws) are a highly sclerotized pair of structures that move at right angles to the body, used for biting, chewing, and severing food.
The earliest insects had chewing mouthparts. Specialisation includes mouthparts modified for siphoning, piercing, sucking and sponging. These modifications have evolved a number of times. For example, mosquitoes and aphids both pierce and suck; however, female mosquitoes feed on animal blood whereas aphids feed on plant fluids. This section ...
All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper) mandible fits into the ventral (lower) mandible and together they function in a scissor-like fashion. [1] [2] The beak may also be referred to as the mandibles or jaws. [3]
It functions to cut and manipulate food in the mouth. [ 6 ] [ page needed ] The galea is a broad, scoop-like, lobe structure, which assists the maxillary palps in sampling items before ingestion. The maxillary palp is serially homologous to the walking leg while the cardo and stipes are regarded by most to be serially homologous to the first ...
In English this part is most commonly termed 'frontalia', 'parafrontalia', or 'frontal orbit', while the simple term 'orbit' refers to the margin of the compound eye. The median part of the lower head, or face, often bears in its lower corners a pair (or a few pairs) of large seta (bristles) called 'vibrissae' and sometimes several or even a ...