Particularly for the prominences and processes of the body wall that encircle most segments, we follow Lyneborg (1970) in using the positional terms ‘dorsomedian’ (DM), ‘dorsolateral’ (DL), ‘laterodorsal’ (LD), ‘lateroventral’ (LV), ‘ventrolateral’ (VL) and ‘ventromedian’ (VM). The processes of the anal division do not conform to the pattern of the regular segments and we follow Lyneborg (1970) in using the terms ‘lateral’ (L), ‘sublateral’ (SL) and ‘subapical’ (SA). Long fleshy structures covering the larval body are named ‘processes’. The term ‘prominences’ is reserved for small structures, usually with a papilla in the middle, which can be wart-like or surrounded by a ring of short projections.