The Turonian plattenkalk of Vallecillo (Mexico) yielded two large-sized gladiuses of octobrachian coleoids. The specimens determined as Boreopeltis ifrimae sp. nov. are both classified as members of the suborder Prototeuthina and represent the first coleoids from the Turonian of Mexico. Belemnoid coleoids are still unknown from Upper Cretaceous localities in Mexico. Boreopeltis ifrimae sp. nov. is the youngest representative of its genus. The occurrence of Boreopeltis in the northwestern Gulf of Mexico suggests a worldwide distribution in cold to warm temperate waters. The gladius (mantle) length of both specimens is remarkable and measures 470 mm, respectively. A general trend towards large and very large-sized coleoids is identified during the Late Cretaceous and began in the Turonian, as indicated by taxa from the southern Western Interior and the northern Gulf of Mexico. This gradual increase in octobrachian body sizes may reflect a commencing escalation in the arms race between coleoids, fishes, and marine reptilians.

Vallecillo（墨西哥）的Turonian plattenkalk 产生了两个大尺寸的octobrachian coleoids 短剑。标本确定为Boreopeltis ifrimae sp。十一月 都被归类为 Prototeuthina 亚目的成员，并且代表了来自墨西哥图伦阶的第一个胶体。Belemnoid coleoids 在墨西哥的上白垩纪地区仍然未知。Boreopeltis ifrimae sp. 十一月 是其属中最年轻的代表。风湿病的发生在墨西哥湾西北部，表明其在全球范围内分布于冷至暖温带水域。两个标本的短剑（地幔）长度都非常显着，分别为 470 毫米。在白垩纪晚期发现了大型和超大型胶体的总体趋势，并开始于土伦纪，正如来自西部内陆南部和墨西哥湾北部的分类群所表明的那样。八臂鱼体型的逐渐增加可能反映了胶体、鱼类和海洋爬行动物之间军备竞赛的开始升级。