noun
smooth hammerhead
Refers specifically to the species Sphyrna zygaena, a type of hammerhead shark.
シロシュモクザメは温帯の海に生息する。
The smooth hammerhead inhabits temperate seas.
シュモクザメ is the general term for hammerhead sharks; シロシュモクザメ is the specific species Sphyrna zygaena.
Compound of 白 (shiro, 'white') + 撞木鮫 (shumokuzame, 'hammerhead shark'), referring to the smooth hammerhead's lighter coloration.