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Vor einem Tag · This list of prehistoric bony fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be bony fish (class Osteichthyes ), excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful ( nomina dubia ...
Vor 3 Tagen · History of science portal. This list of fossil fishes described in 2014 is a list of new taxa of placoderms, fossil cartilaginous fishes and bony fishess of every kind that have been described during the year 2014, as well as other significant discoveries and events related to paleontology of fishes that occurred in the year 2014.
Vor 4 Tagen · Ichthyosaurian species varied from 1 to 26 metres (3 to 85 ft) in length. Ichthyosaurians resembled both modern fish and dolphins. Their limbs had been fully transformed into flippers, which sometimes contained a very large number of digits and phalanges. At least some species possessed a dorsal fin.
Vor 3 Tagen · Susume Ohno, a geneticist with an impressive handlebar mustache, called it ‘junk DNA’. In eukaryotes, this supposedly useless DNA takes up a lot of space. Half the human genome is junk, while the marbled lungfish only needs 1/36th of its humongous genome.
Vor 3 Tagen · Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes), and superclass Osteichthyes ( bony fishes ). The latter two groups are included within the infraphylum Gnathostomata, a category containing all jawed vertebrates.
15. Mai 2024 · Jawless fishes probably arose from ancient, small, soft-bodied filter-feeding organisms much like and probably also ancestral to the modern sand-dwelling filter feeders, the Cephalochordata ( Amphioxus and its relatives). The body in the ancestral animals was probably stiffened by a notochord.
Vor 3 Tagen · The Actinopterygii, or ray-finned fishes, are the largest class of fishes. In existence for about 400 million years, since the Early Devonian, it consists of some 42 orders containing more than 480 families, at least 80 of which are known only from fossils.
