皱鳃鲨 / Frilled shark

My unusual gills and teeth remind you: living relatives keep evolving, even when they look wonderfully prehistoric!
我特别的鳃和牙齿提醒你：活着的亲戚一直在演化，就算模样很有史前范儿！

Sources
Quantitative imaging supports that endoskeletal mineralization in sharks is an adaptive trait
https://www.nature.com/articles/s42003-026-11078-y
Species reference
https://en.wikipedia.org/wiki/Frilled_shark

Research context
Frilled sharks offer a living example of distinctive shark anatomy. Their gills and teeth are useful comparative traits, but the living species should not be mistaken for an unchanged ancestor.