User:Martino3/new sections homology

Structural homologies in other animal phyla
Discussions of homology commonly limit themselves to the limbs of tetrapod vertebrates, occasionally touching on other structures, such as modified teeth as in whales and elephants. Numerous homologies exist elsewhere in the animal kingdom, although some of them may be highly counterintuitive. For example, within the arthropods, Brusca and Brusca provide the following homologies for the first 10 somites (embryonic segments) in several groups of arthropods, and adds that "...the subject of head appendage homology among the arthropods is quite unsettled and highly controversial..."

Homologies across phyla
See Deep homology.

Plants
Modifications of primary leaves, stems, and roots occur in many higher plants.

Examples