Cladistics: Oxysalpincoidea

Oxysalpincidia are the most widespread Diplaulote Trapezostomes on Eryobis and include a myriad of families and species.

But perhaps the most recognizable members belong to a subdivision of the group, the superfamily called Oxysalpincoidea.

Members of this subfamily are more bipedal than their relatives and the majority of their kind are completely bipedal with greatly reduced front limbs.

While Oxysalpincoids likely came from the continent of Tlèëa, these bidepal forms seem have had their origin in Guralta. These creatures are almost exclusively herbivorous and occasionally enrich their diet with arthropods and other invertebrates like fallen skysquirts. 

Some of the most commonly encountered Oxysalpincoids are the Tachyornithids. These highly cursorial herbivores can often be seen roaming the savannas and plains of Guralta and southern Tlèëa in huge flocks. They are known for their short faces and beaks, extremely short arms with clawless rudimentary digits. In the males, these arms are often brightly colored and only serve for sexual display. 

Additionally, Tachyornithids often have elaborate headgear and spiracular tubes and that are usually just as brightly colored as the arms in males. 

Compared to these slender athletes, their closest relatives are completely on the other side of the spectrum. The Behemopods, while equally bipedal as Tachyornithids, went in the other direction and instead of becoming long legged runners, became massive tanks. 

Behemopods dubbled down even more on reducing their arms to the point where they get fused into the skin. But since running no longer became a viable option as they grew in stature, they needed some kind of defense. So these titans derived what they still had to an extreme extent. In a very Kadrian way, they turned the claws from their arms into massive spikes for self defense. These fearsome claws, combined with their strong scaly and often armored tails and immense sizes make Behemopods a force to be reconed with.

The majority of their kind are at least 8 meters long from head to tail, with the very largest species having been recorded at over 21 meters in length. This makes Behemopods the biggest animals in Guralta, some of the largest terrestrial animals alive and by far the greatest land based Trapezostomes to have ever lived.

There's also the basal genus Xenulops, which is kind of an enigma. It lives in the dense forests of Lachoba, far more southern than other Oxysalpincoids. 

Any DNA tests on it have come back inconclusive, with some placing closer to Tachyornithids while others place it closer to Behemopods and then there are a few that suggests its more basal than either.

Unlike either other family, Xenulops retains its arms with all of its digits and claws intact. Its feet are similar to those of Behemopods while its overall leg anatomy is more akin to Tachyornithids. It is an odd genus that is likely to continue being enigmatic for the foreseeable future.