noun
bowmouth guitarfish; shark ray; mud skate
A species of ray (Rhina ancylostoma) also known as the shark ray or mud skate. The name is a biological term; in everyday contexts, it is usually written in katakana.
水族館でシノノメサカタザメを見た。
I saw a bowmouth guitarfish at the aquarium.
シノノメサカタザメはサメに似ているが、実はエイの仲間だ。
The bowmouth guitarfish looks like a shark, but it is actually a type of ray.
The name is a compound of 東雲 (しののめ, 'dawn'), 坂田 (さかた, a place name or surname), and 鮫 (ざめ, 'shark'), but the exact origin is uncertain. It likely refers to the fish's appearance or a historical naming association.