毛虫，肉虫，２ kinds of caterpillar， Wikipedia and 百度百科 both state that larvae of butterflies come in two varieties, 肉虫 and 毛虫 (in that order: 幼虫的形状多样，有肉虫，也有毛虫。), and there are plenty of pictures of both types, but 肉虫 cannot be found in any online dictionary and is not even in 现代汉语词典，also while Wikipedia has an entry for 毛虫, there is none for 肉虫, 百度百科 has a very short one not even mentioning that 肉虫 are larvae of certain adult forms of animal (butterflies), in fact the editors are aware of the shortcomings of their article and call for assistance in writing up a more complete article. Any explanation for the above? Wikipedia's article on butterflies mentions only one type of larvae, caterpillar, are there different English words for the two types?
In English, larvae of butterflies and moths are all called caterpillars, whether they have hair or not. Interestingly, in Japanese Wikipedia, caterpillars with and without hair are separated into more detailed categories. For example, caterpillars with hair are called kemushi ("ke" means "hair", "mushi" means "insect", or "caterpillar" in this context), and those without hair are called imomushi ("imo" means "potato", possibly because Japanese peasants witnessed hairless Sphingidae larvae eating potatoes, and potatoes were important staple food source in Edo era. Later, they use this word to indicate all hairless caterpillars). However, both articles point to "caterpillar" in English.
Maybe you can use "hairy" and "hairless" to indicate their differences? At least I don't know any word that's specific to academic use to express that...