Rough-toothed dolphin

The rough-toothed dolphin (Steno bredanensis) is a species of dolphin that can be found in deep warm and tropical waters around the world.

The species was first described by Georges Cuvier in 1823. The genus name Steno, of which this species is the only member, comes from the Greek for 'narrow', referring to the animal's beak — which is a diagnostic characteristic of the species. The specific name honours van Breda, who studied Cuvier's writings. There are no recognised subspecies.

Description

The rough-toothed dolphin is a relatively large species, with adults ranging from 2.09 to 2.83 metres (6.9 to 9.3 ft) in length, and weighing between 90 and 155 kilograms (198 and 342 lb); males are larger than females. Its most visible characteristic feature is its conical head and slender nose; other dolphins either have a shorter snout or a more visibly bulging melon on the forehead. As the common name for the species implies, the teeth are also distinctive, having a roughened surface formed by numerous narrow irregular ridges. They have been reported to have between nineteen and twenty-eight teeth in each quarter of the jaw.

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Steno

Steno may refer to:

Steno, small community at the northwest of Salamis Island, Greece

Stenography, the process of writing in shorthand

Stenotype, a specialized chorded keyboard or typewriter used by stenographers for shorthand use

Stenotype, a specialized chorded keyboard or typewriter used by stenographers for shorthand use

Stenotrophomonas maltophilia (Steno), an aerobic, nonfermentative, Gram-negative bacterium which causes uncommon but difficult to treat infections in humans

Steno (lunar crater)

Steno (genus), the monotypic genus of the Rough-toothed Dolphin

Steno Diabetes Center, a research and teaching hospital in Gentofte, Denmark

Steno Endemic, fauna/flora existing only in 1 singular place, e.g., 1 lake, 1 islet/-land, 1 mountain

Nicolas Steno (1638–1686), a pioneer in anatomy and geology

Stefano Vanzina (aka Steno) (1915–1988), Italian movie director, famous for kickstarting the subgenre Poliziotteschi films

Steno (lunar crater)

Steno is a relatively small lunar impact crater that is located in the northern hemisphere on the Moon's far side. It lies to the south-southwest of the slightly larger crater Stearns, a much younger and less worn formation. Farther to the northwest of Steno is Appleton, and to the east is Nušl.

This is a worn crater formation that has a circular outer rim that remains relatively well-defined. The rim edge is marked only by a few tiny craterlets. The interior floor and inner walls are nearly featureless, except for a few faint groove marks and some tiny craterlets. It is otherwise an undistinguished formation.