These free-moving folds or filaments are called the plica fimbriata and attach to the base of the sublingua and are supported at the midline by the plica mediana.
22.
The lemuriform toothcomb is kept clean by the sublingua or " under-tongue ", a specialized muscular structure that acts like a toothbrush to remove hair and other debris.
23.
In tarsiers, the sublingua does not have serrations along its tip and is much simpler and generalized in structure, making it clearly distinguishable from that of the lemuriform primates.
24.
Although colugos also have a toothcomb, consisting of serrated edges on the tips of their incisors instead of finely spaced, elongated teeth, they do not have a sublingua.
25.
In the species that have cartilage in the sublingua or lytta, that cartilage is not derived from the hyoid bone or hyoid arch ( the bone and cartilage that supports the tongue ).
26.
Only the serrated and often keratinized tip of the sublingua is free to move small distances along the underside of the tongue, while the majority of its length adheres to the underside of the tongue.
27.
In lemuriforms, the sublingua mostly consists of two plicae fimbriatae ( singular : plica fimbriata ), which run along the sides of the plica mediana and end in comb-like serrated edges that are hardened with keratin.
28.
In the aye-aye, which has replaced the toothcomb by evolving continually growing, rodent-like incisors, the hook-shaped tip of the sublingua fits precisely within the gap between the two lower incisors and keeps the area clean.
