''Cyrtospirifer verneuili'', also called ''Spirifer verneuili'', is an extinct species of

brachiopod Brachiopods (), phylum (biology), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear e ...

. The fossils are present in the Upper

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

. In

Cornwall Cornwall (; or ) is a Ceremonial counties of England, ceremonial county in South West England. It is also one of the Celtic nations and the homeland of the Cornish people. The county is bordered by the Atlantic Ocean to the north and west, ...

they have the vernacular name Delabole butterfly, from the appearance of flattened forms in the slates at

Delabole Delabole () is a large village and civil parish in north Cornwall, England, United Kingdom, which lies approximately two miles (3 km) west of Camelford. The village of Delabole came into existence in the early 20th century; it is named af ...

References

Paleobiology Database
Prehistoric brachiopods Spiriferida {{Brachiopod-stub