New records of the late Pliensbachian to early Toarcian (Early Jurassic) gladius-bearing coleoid cephalopods from the Ya Ha Tinda Lagerstätte, Canada

The Ya Ha Tinda Lagerstätte from Alberta, Canada, is the first Jurassic marine Konservat-Lagerstätte from North America and hosts a substantial collection of exceptionally preserved fossil Vampyropoda specimens. Vampyropods are soft-bodied cephalopods (coleoids) characterized by eight arms and an internalized chitinous shell (gladius). Due to their lack of hard parts, Vampyropoda have a fragmentary fossil record, largely limited to exceptional Lagerstätten deposits. Excavations at Ya Ha Tinda have uncovered sixteen vampyropod fossils from Pliensbachian and Toarcian strata, making it the largest deposit of Vampyropoda found outside of the Tethys Ocean (Europe and the Middle East) for the Jurassic. Here, we present a taxonomic analysis of the Ya Ha Tinda Vampyropoda specimens and the first comprehensive study of Early Jurassic vampyropods from North America.
In total, fourteen specimens have sufficient morphological details preserved on the gladius for taxonomic descriptions. Two specime...

加拿大阿尔伯塔省的Ya Ha Tinda化石库是北美首个侏罗纪海洋特异埋藏化石库（Konservat-Lagerstätte），保存了大量异常完好的幽灵蛸类（Vampyropoda）化石标本。幽灵蛸类是软体头足类（coleoids，鞘亚纲），具有八条腕和内化的几丁质外壳（gladius，箭鞘）。由于缺乏硬体部分，幽灵蛸类的化石记录较为零碎，主要局限于特异的化石库（Lagerstätte）沉积。Ya Ha Tinda的发掘工作从普林斯巴阶（Pliensbachian）和托阿尔阶（Toarcian）地层中发现了16件幽灵蛸类化石，使其成为侏罗纪时期在特提斯洋（Tethys Ocean，欧洲及中东地区）以外发现的最大幽灵蛸类化石产地。本文对Ya Ha Tinda的幽灵蛸类标本进行了分类学分析，并首次对北美早侏罗世幽灵蛸类展开了全面研究。总计14件标本的箭鞘（gladius）上保存了足够的形态学细节，可用于分类学描述。两件标本...