infraphylum

the vertebrates are classified within the infraphylum gnathostomata.

scientists discovered a new fossil belonging to this infraphylum.

biologists place these jawless fish in the infraphylum agnatha.

this specific trait is characteristic of the entire infraphylum.

the evolutionary history of this infraphylum remains unclear.

specimens from this infraphylum were found in ancient rock layers.

comparative anatomy helps distinguish species within the infraphylum.

textbooks describe the infraphylum as a major taxonomic rank.

researchers are analyzing the genetic code of the infraphylum.

several classes of organisms fall under this infraphylum.

phylogenetic trees show the divergence of each infraphylum.

distinguishing this infraphylum requires careful observation of morphology.