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Protosphyraena is a fossil genus of swordfish-like marine fish, that thrived worldwide during the Cretaceous period (Albian-Maastrichtian). Fossil remains of this taxon are mainly discovered in North America and Europe, and potential specimens are also known from Asia, Africa and Australia. [1]
The swordfish (Xiphias gladius), ... 2007, a fisherman died after being attacked by a swordfish which pierced his eye and its bill penetrated into the man's skull.
Diagram of a wolf skull with key features labelled. In mammals, the rostrum is that part of the cranium located in front of the zygomatic arches, where it holds the teeth, palate, and nasal cavity. [6] Additionally, the corpus callosum of the human brain has a nerve tract known as the rostrum.
The skull of fishes is formed from a series of loosely connected bones. Lampreys and sharks only possess a cartilaginous endocranium, with both the upper and lower jaws being separate elements. Bony fishes have additional dermal bone, forming a more or less coherent skull roof in lungfish and holost fish.
The rostrum is an extension of the chondrocranium ("skull"), [28] made of cartilage and covered in skin. [38] The rostrum length is typically about one quarter to one third of the total length of the fish, [ 5 ] but it varies depending on species, and sometimes with age and sex. [ 3 ]
Skull of a swordfish In ray-finned fish , there has also been considerable modification from the primitive pattern. The roof of the skull is generally well formed, and although the exact relationship of its bones to those of tetrapods is unclear, they are usually given similar names for convenience.
Xiphiorhynchoides is an extinct genus of swordfish from the Oligocene of Austria. Its fossils have been found in the Paisslberg Formation in Tyrol, which is thought to represent a deepwater environment close to the shore. It is the best preserved member of the Xiphiorhynchinae and known from a single species: X. haeringensis.
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