Insect Mouthparts (Sept. 15)

Insect Mouthparts (Sept. 15) - Insect Mouthparts...

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Insect Mouthparts Orientation of mouthparts o Hypognathous- Mouthparts are directed ventrally downward. Primitive condition in Insecta. (Thysanura, cockroaches, mantids, phytophagous beetles). o Prognathous- Common in carnivorous groups that actively pursue prey (earwigs, larval neuropterans, coleopterans, termite soldiers and ants). o Opisthognathous- Mouthparts directed backward. Common in hemipteroid orders with sucking mouthparts. Function (chewing) o The labrum is the anterior most mouthpart and muscles attached to the labrum move it outward, away from the other mouthparts and inward toward the other mouthparts during feeding. o Size and shape of the incisors and molar cusps varies with diet. o The maxillae (single maxilla) move food particles backwards into the preoral cavity. The maxillary palps are sensory organs used to test the quality of the food. o The labium is the protective “cover” to the mouth and contains labial palps, which act as sensory organs similar to the maxillary palps.
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