Noun
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 dictionaryLingula is among the few brachiopods surviving today but also known from fossils over 500 million years old. Source: Internet
Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils. Source: Internet
The Silurian Lingula differs but little from the living species of this genus". Source: Internet