A 2019 molecular phylogenetic study found that the four living species of horseshoe crabs are actually aquatic arachnids, and not just an order of arthropods closely related to arachnids, as was previously thought. As arachnids, they are most closely related to hooded tickspiders. academic.oup.com/sysbio/aโฆ
Hyenas are closer to cats than dog: "Although phylogenetically they are closer to felines and viverrids, and belong to the feliform category, hyenas are behaviourally and morphologically similar to canines" en.wikipedia.org/wiki/Hyeโฆ
Horseshoe crabs aren't crabs at all. They're far closer related to spiders than they are to crustaceans. In fact, horseshoe crabs are arachnids. en.wikipedia.org/wiki/Xipโฆ
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