Siksika ottae is an extinct prehistoric cartilaginous fish, lived during the Upper Mississippian. It has been discovered at the well known Bear Gulch Formation (Montana

Montana

Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

), dated at Carboniferous period. It is known mostly on the base of fossil teeth, but also partially neurocranium and mandibles which hint a close relationship to coeval petalodontiform sharks Janasssa and Netsepoye

Netsepoye

Netsepoye hawesi is an extinct prehistoric cartilaginous fish, which lived around 420 million years ago, during the Late Mississippian. It has been discovered at the well known Bear Gulch Formation in Montana, United States, dated at Carboniferous period. This Paleozoic fish is mostly known by...

. Dentition is generally heterodont.

Siksika means literally Blackfoot

Blackfoot

The Blackfoot Confederacy or Niitsítapi is the collective name of three First Nations in Alberta and one Native American tribe in Montana....

, being named after the Siksika Nation

Siksika Nation

The Siksika Nation is a First Nation in southern Alberta, Canada. The name Siksiká comes from the Blackfoot words sik and iká , with a connector s between the two words. The plural form of Siksiká is Siksikáwa...

.