Discinida

Discinida is an order of brachiopods comprising the extant superfamily Discinoidea, and the extinct superfamilies Botsfordioidea (early—mid-Cambrian) and Acrotheloidea (early Cambrian–Early Ordovician).^[2] It represents a sister taxon to the Lingulids, and is possibly paraphyletic with respect to the Acrotretoids.^{[3][verification needed]}—or the acrotretids are paraphyletic with respect to it.^[4] The group displays a broad range of shell structures, some of which incorporate substantial organic or silicified components.^[3]

Discinida Temporal range: Cambrian Stage 2–Recent[1] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Brachiopoda
Subphylum:	Linguliformea
Order:	Discinida
Superfamilies
Discinoidea Discinidae Discina Discinisca Discradisca Pelagodiscus †Trematidae † Botsfordioidea ... †Acrotheloidea (?) ...