- scavenger
- sclerotised
- sediment
- sediment traps
- segment
- selvage
- seminal receptacle
- seminal vesicle
- serrate
- seta
- setose
- setule
- seventh limb
- shell
- shoulder vault
- sixth limb
- species
- spermathecal sac
- spheroidal
- spine
- stem
- stomach
- striae
- striation
- sub-
- suborder
- substrate
- superfamily
- swimming setae
- symbiosis
- synonym