Ventral setae

Most ventral setae are short and flagellate, but a few are longer and these (and their frequency) can be of some taxonomic significance. The most common distribution of the longer setae is: a pair medially on the pregenital segment (segment VII) (the pregenital setae) and often with additional pairs on the preceding two segments (segments VI and V); in addition, there may be long setae elsewhere, such as just mesad to each coxa and between the antennae (inter-antennal setae). The submarginal setae are a single row of setae just mesad to the margin and their frequency is given as the number laterally between the stigmatic clefts; the anterior anal cleft setae are a group of 1 to several setae that occur on either side towards the anterior end of the anal cleft; a pair of ventral anal lobe setae occur on the anal lobes near the margin and their length appears to be taxonomically significant; and the abdominal setae are those found medially on each abdominal segment and their frequency are also thought to be significant.