FIGURE 3. Larval polytene chromosomes, IIIS arm. a in Taxonomy and biology of Simulium clarkei Stone & Snoddy (Diptera: Simuliidae), a poorly known black fly of the southeastern United States

FIGURE 3. Larval polytene chromosomes, IIIS arm. a. Simulium emarginatum, Meherrin River, Virginia, showing standard sequence. b. Simulium clarkei, Meherrin River, North Carolina, showing IIIS inversion (brackets) with reversed orientation of 'blister' (bl) and 'capsule' (ca) markers. The centromere is on the left of each chromosome arm.