Symmoriida is an extinct order of sharks that contains three families. It was synonymized subjectively with Cladodontida by Lund (1986); it was corrected as Symmoriiformes by Maisey (2008). It was assigned to Cladoselachii by Goto et al. (1988); to Elasmobranchii by Williams (1998); and to Chondrichthyes

Chondrichthyes

Chondrichthyes or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, two-chambered hearts, and skeletons made of cartilage rather than bone...

 by Sepkoski in 2002 and by Maisey in 2008.

Fossil distribution

Fossil evidence of Symmoriida have been found at Bear Gulch, Fergus County, Montana

Fergus County, Montana

-National protected areas:* Charles M. Russell National Wildlife Refuge * Lewis and Clark National Forest * Upper Missouri River Breaks National Monument -Demographics:...

, Bethel Quarry, Pike County, Indiana

Pike County, Indiana

As of the census of 2000, there were 12,837 people, 5,119 households, and 3,680 families residing in the county. The population density was 38 people per square mile . There were 5,611 housing units at an average density of 17 per square mile...

, Kinshozan quarry, Akasaka, Gifu Prefecture

Gifu Prefecture

is a prefecture located in the Chūbu region of central Japan. Its capital is the city of Gifu.Located in the center of Japan, it has long played an important part as the crossroads of Japan, connecting the east to the west through such routes as the Nakasendō...

, Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

, and Bashkortostan, Russian Federation.