noun
dewdrop spider; Argyrodes spider
A small spider of the genus Argyrodes, often found in the webs of larger spiders.
イソウロウグモは他のクモの巣に住み着く。
Dewdrop spiders live in the webs of other spiders.
From 居候 (いそうろう, 'freeloader') + 蜘蛛 (くも, 'spider'), referring to its habit of living in other spiders' webs.