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BIOL212
Majors animal: External anatomy of a grasshopper (matching)
Structure | Function |
---|---|
Compound eyes | Paired, complex, image-forming photoreceptors composed of numerous ommatidia that create a fairly coarse-grained picture of their visual field |
Ocellus | Simple photoreceptor consisting of a small cup backed by light-absorbing pigments; not capable of image formation |
Antennae | Thin, paired appendages on head modified for chemosensory and tactile reception |
Mouthparts | Multiple sets of hard, chininous appendages used to chew food and manipulate food into the mouth |
Wings | Two sets of paired appendages modified for flight |
Tympanum | Circular, pressure-sensitive membrane on each side of the thorax that detects sound waves; functions as an "ear drum" |
Spiracles | External openings in abdomen that allow air flow into and out of tracheae |
Ovipositor | External reproductive opening bordered by tiny, chininous teeth that penetrate the soil and create burrows for egg deposition |