(phylum Brachiopoda, class Inarticulata)
An order of brachiopods that have valves of calcium phosphate with some layers of organic material. The valves may be finely punctate or impunctate. The pedicle emerges between the valves posteriorly. Lingulida are usually marine, but some are tolerant of reduced salinity. They first appeared in the Early Cambrian. There are two superfamilies, comprising eight families, and about 50 genera.
Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.