lingula has not risen since the Silurian epoch, whereas other molluscs may have risen.
The Buglossus solea or soale plana & oculata as also the lingula or small soale all in very great plentie.
lingula, among others, is remarkable as being a form that has survived from the earliest geological period to the present day.
A leathern tongue (lingula) is often seen to project from beneath the straps.
The genus lingula (Mollusca) has also come down from remotest ages, having outlived all its earlier associates.
The ancient lingula, along with Crania and Orbiculoidea, occur among the inarticulate forms.
Another interesting point is a most curious chemical relation of the lingula, with reference to the material of its shell.
lingula cornea, Platyschisma helicites and numerous phyllocarids and ostracods occur among the fossils.
The curious Crania, Discina, and lingula are still living, and are mostly found in the seas of the southern hemisphere.
The lingula Flags mark a local return to shallower water conditions, especially in the central portion.
lingula lin·gu·la (lĭng'gyə-lə)
n. pl. -lae (-lē')
Any of several tongue-shaped processes.