This is the third of four scanning electron micrographs (SEM) that are representative of successively greater magnifications of the thoracic region of an unidentified mosquito discovered in the suburbs of Decatur, Georgia. At a magnification 5X greater than PHIL 10519, and twice that of 10520, this SEM depicts the morphology of this region focusing on the anatomical feature known as the 'spiracle', which is one of two orifices located on the thorax through which the insect breaths. Note that PHIL 10522 is at an even greater magnification of the spiracle. There are eight additional spiracles located on the abdominal region as well. You'll also note the presence of numerous setae, or sensorial 'hairs', as well as many light-weight scales, all of which are composed of the same material as the exoskeleton itself, a substance known as chitin.
CDC/ Janice Haney Carr
December 1, 2012
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