In most arachnids only the females provide parental care, with harvestmen being one of the few exceptions.

Taxonomy and evolution

Phylogeny

The phylogenetic relationships among the main subdivisions of arthropods have been the subject of considerable research and dispute for many years. A consensus emerged from about 2010 onward, based on both morphological and molecular evidence; extant (living) arthropods are a monophyletic group and are divided

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