本研究首次报道了墨西哥湾西南部水域捕获的钝吻六鳃鲨 (Hexanchus griseus)成年雄性个体（326 cm TL，197 kg），通过形态学测量和分类学鉴定，确认其为墨西哥湾及加勒比海海域的首个凭证标本。该发现填补了该物种在墨西哥海域的分布空白，为深海鲨鱼生态研究和区域生物多样性保护提供了重要依据。

Sixgill shark (Hexanchus griseus) seen while exploring Santa Rosa Reef, south of Guam, during the first dive of the Deepwater Exploration of the Marianas expedition on April 20, 2016.

As Jaws celebrates its 50th anniversary, Science News explores the vast range of shark sizes, from megaladon to the dwarf lanternshark.