A new species of spider was recently discovered near a forested area in Nong Rong, Phanom Thuan, Kanchanaburi, in western Thailand. The spiders were presented to researchers at the Chulalongkorn University Museum of Natural History, where they were studied further.
Weirdly enough, it’s super common for intersex animals to be split right down the middle like that. There’s other types of chimerism like what you described tho, if you want to go down that particular rabbit hole of nerdery.