is an extinct genus
of large brachiopods
; between 360 to 408 million years old, they are usually found as fossils
marine rocks. Several forms of the genus are known; they may be found in western North America
, northern Europe
and the Canning basin of Western Australia. Several different types are known; they share a well-developed, curved structure shaped like a beak
. Some of the largest specimens discovered to date have been found in China
Playford, P. E. and Lowry, D. C. 1966. Devonian reef complexes of the Canning Basin, Western Australia. Geological Survey Bulletin 118.