The facial sutures converge on the front border at the midline.
2.
They are believed to have never developed facial sutures, having pre-dated their evolution.
3.
In most groups facial sutures on the cephalon helped facilitate moulting.
4.
Some other later trilobites also lost facial sutures secondarily.
5.
All Olenellina lack facial sutures ( see below ), and this is thought to represent the original state.
6.
Even more pronounced is the situation that the frontal branches of the facial sutures end in each other, resulting in yoked free cheeks.
7.
In many Phacopidae, where the facial sutures are apparently continuous and well developed, they were evidently nonfunctional in ecdysis, since no separate free cheeks can be found.
8.
Some derived trilobites have lost facial sutures again ( some Eodiscina, all Agnostina, and a few Phacopina ), but all of these are blind, while all Olenellina have eyes.
9.
In his own study of 111 patients, those who got DermaBond had less swelling and inflammation and none of the suture scars that standard facial suturing can cause, he said.
10.
This is known in " Triarthrus ", and in the Phacopidae, but in that family are the facial sutures not functional, as can be concluded from the fact that free cheeks are not found separated from the cranidium.
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