Symmorium
Extinct genus of cartilaginous fishes
From Wikipedia, the free encyclopedia
Symmorium is an extinct symmoriiform cartilaginous fish from the Devonian and Carboniferous of the United States (Illinois)[1][2] and Russia.[3] The type species, Symmorium reniforme, was named by Edward Drinker Cope in 1893,[4] with other species assigned to the genus having since been reclassified into other genera such as Petalodus. Symmorium bears close similarity in size and appearance to Stethacanthus[5] but lacks the "spine-brush complex" in place of the first dorsal fin.[6] Some paleontologists think that the two forms represented the males and females of related species, while other scientists think they were distinct genera.[6][7]
| Symmorium Temporal range: Devonian-Carboniferous, | |
|---|---|
| |
| Fossil specimen (FMNH PF 2202) of S. reniforme, Field Museum of Natural History | |
 | |
| Life restoration of S. reniforme | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Order: | †Symmoriiformes |
| Family: | †Symmoriidae |
| Genus: | †Symmorium Cope, 1893 |
| Species: | †S. reniforme |
| Binomial name | |
| †Symmorium reniforme Cope, 1893 | |
