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Message: <blockquote data-quote="Phil" data-source="post: 152917" data-attributes="member: 4151">back to the original ask from this post.The request for a Size guide is a bit too generic given the hundreds (if not thousands) of different genus out there in the hobby.However, in my experience (30 years of successfully keeping spiders) I would very loosely summarise as:TerrestrialCommon species Brachypelma, Aphonophelma and GrammastolaSize (all approximate) = 6 inches DLS (Diaganol Leg Span).Females are usually bigger than males. Not a sexist remark, just a fact.There are larger species such as Lasiodora (up to 10 or 11 inches), Theraphosa (up to 12 inches) and Acanthoscurria (up to 9 inches)There are also a number of "dwarf"* species that can only measure anywhere between 2 and 4 inchesArborealCommon species Avicularia and CeribenaSize (all approximate) = 5 inches DLS (Diaganol Leg Span).Females are usually bigger than males. Not a sexist remark, just a fact.There are larger species such as Poecilotheria (up to 10 or 11 inches) and some of the Tapi species, generally thay all have a "leggy" appearance when compared to terrestrial species.There are not many "dwarf"* type arboreal spiders readily available so I have not mentioned them here.That's a starter for ten, in no way is it a full size guide due to the hundreds of species out there but will give you an idea.Hope I have been helpful.*"dwarf" is not my term, this is a term used in the hobby.</blockquote>