In many cases the vibracula have a grooved support at the base, which seems to represent the fixed beak; though this support in some species is quite absent.
They seem to have come from some very primitive mammal near the base of Laurasiatheria that also gave rise to one or more of the other groups in the superorder.
This species links together other groups of reptiles we hadn’t fully understood before, and paleontologists put them into their own, new group at the base of the bird branch, called Aphanosauria!
The basal part of the labellum stands over the bucket, and is itself hollowed out into a sort of chamber with two lateral entrances; within this chamber there are curious fleshy ridges.
These rhombs have certain angles, and the three which form the pyramidal base of a single cell on one side of the comb, enter into the composition of the bases of three adjoining cells on the opposite side.