smooth hammerhead
Refers specifically to the species Sphyrna zygaena, a type of hammerhead shark.
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.
Katakana spelling is common for this species name; usually written in kana.
Kanji spelling is rare and mainly found in specialized contexts; usually written in kana.
Compound of 白 (shiro, 'white') + 撞木鮫 (shumokuzame, 'hammerhead shark'), referring to the smooth hammerhead's lighter coloration.