lingula
Noun
Meaning
A tonguelike process or part.
Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix.
Source: Webster's dictionarySynonyms
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Lingula is among the few brachiopods surviving today but also known from fossils over 500 million years old.
Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.
The Silurian Lingula differs but little from the living species of this genus".