Good question. No, they do vary! There are quite a lot of different species of bobtail squid, as that is the order, and more have been discovered as recently as 2010. They are usually quite small though, but they can be different sizes, from around 1-8cm (length of male mantle). They are very cool animals, you can read a bit more about them here (https://www.nature.com/articles/s42003-021-02348-y)
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