also: しゅけいるい
In old documents, the notation 蛛形類 can be seen, but nowadays クモ形類 is used.
Modern standard term for arachnids; 蛛形類 is an obsolete synonym.
Composed of 蛛 (spider), 形 (form), and 類 (category). The reading ちゅ is the on'yomi of 蛛, while しゅ is an alternative on'yomi. The term is now obsolete, replaced by クモ形類.