Doryaspis is an extinct genus of armored jawless fish belonging to the order Pteraspidiformes. It contains five species, all of which are exclusively known from what is now the island of Spitsbergen in the Svalbard archipelago of Norway. The genus lived during the Pragian to Emsian ages of the Early Devonian period. Doryaspis is distinguished from other pteraspidiforms by several unusual features, most notably its narrow, outward-pointing cornual plates and a long, pointed projection near its mouth known as a pseudorostrum.
Doryaspis is an extinct genus of armored jawless fish belonging to the order Pteraspidiformes. It contains five species, all of which are exclusively known from what is now the island of Spitsbergen in the Svalbard archipelago of Norway. The genus lived during the Pragian to Emsian ages of the Early Devonian period. Doryaspis is distinguished from other pteraspidiforms by several unusual features, most notably its narrow, outward-pointing cornual plates and a long, pointed projection near its mouth known as a pseudorostrum.
== Discovery and research history == left|thumb|270x270px|Lithography|Lithograph featuring the first known fossils of Doryaspis, described as a species of the now-invalid genus Scaphaspis (figures 1–3a) Fossils of what would later be described as Doryaspis were first discovered by Alfred Gabriel Nathorst during a Swedish expedition to Spitsbergen in 1882. The fossils consisted of several disarticulated ventral armor plates recovered from the Wood Bay Formation. Two years later, zoologist Edwin Ray Lankester identified these as the bony cephalic (head) shield of a cephalaspid fish, a group that pteraspidomorphs were, at the time, thought to belong to. He noted that the fossils were similar in form to those of Scaphaspis lloydii from England and established a new species for the specimens, Scaphaspis nathorstii. In the year 1900, Scaphaspis was deemed synonymous with Pteraspis, and Arthur Smith Woodward reassigned these fossils under the name Pteraspis nathorsti. Johan Aschehoug Kiær later studied the material and recognized it as representing a taxon distinct from Pteraspis, establishing the genus Doryaspis to refer to the plates. However, before Kiær's work could be published, paleontologist Anatol Heintz used the name "Dyreaspis" for the same specimens in 1934. This name never received an official diagnosis and is considered a nomen nudum. Kiær passed away before his study could be published, but his work was eventually utilized by geologist Errol Ivor White who recognized the genus Doryaspis in 1935.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).