Cambrian Brachiopoda. Brachiopoda, Fossil. Figure 34.—Interiors of valves of Obolus and Lingula. Obolus apolUnis quenstedti Mickwitz. After Mickwitz [1896, figs. Oa-b, p. 79]. A, Ventral valve; B, dorsal valve. I. Splancimoccele.
Brachiopods: Aren't they just mussels? | Skeptical Squirrel
Views of the Mahantango: Lingula coburgensis Brachiopod from the Coburg formation
Pennsylvanian Atlas of Ancient Life: American Midcontinent | Lingula
Lingula delia - Members Gallery - The Fossil Forum
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Living fossils
Lingulata - Wikipedia
File:Lingula sp. (fossil brachiopod) in nodule (Rushville Shale, Lower Mississippian; Trinway West 6 Outcrop, Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 2 (41559013844).jpg - Wikimedia Commons
Proof that Lingula (Brachiopoda) is not a living-fossil, and emended diagnoses of the Family Lingulidae