larval seta thoracic seta In fourth stage larvae, maxima of the 15 pairs of setae are known on the prothorax, 14 on the mesothorax and 13 on the metathorax. Each of these setae is individually designated first by a numeral showing its actual or in some cases presumed primitive position in the "basic pattern" of the Culicidae in which seta 1 arises closest to the dorsal longitudinal midline with the positions of successively higher-numbered setae following progressively and circumferentially toward the ventral longitudinal midline, and second by a hyphen and a capital letter P, M or T indicating the position on the pro-, meso- or metathorax respectively. TGMA:0000809 TGMA:0000809 default_namespace