arachne
A common variety of monstrous spider girl in which the human parts beneath the waist/torso have been entirely replaced by the body of a spider. Extra eyes are a common addition. Good examples can be found in Rachnera Arachnera's character sheet or the Monster Girl Encyclopedia entry.
Note that merely having spider parts (e.g. post #1282030) is not enough for this tag. For spider-legged girls retaining human legs, consider arthropod limbs and extra legs.
For monster girls of similar body type but not based on spiders, see centauroid.
See also
The following tags are aliased to this tag: drider (learn more).
This tag implicates monster_girl, spider_girl, and taur (learn more).