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Icthyocentaur with trident. Hotel Sacher, Vienna. Four-legged ichthyocentaur. Fountain of the Centaurs, Missouri State Capitol. In late Classical Greek art, an ichthyocentaur (Greek: ἰχθυοκένταυρος, plural: ἰχθυοκένταυροι) was a centaurine sea being with the upper body of a human, the lower anterior half and fore-legs of a horse, and the tailed posterior half of a ...
Osteichthyes (/ ˌ ɒ s t iː ˈ ɪ k θ iː z / ost-ee-IK-theez), [2] also known as osteichthyans or commonly referred to as the bony fish, is a diverse superclass of vertebrate animals that have endoskeletons primarily composed of bone tissue.
Genetic testing was performed on Methuselah in 2023 to estimate her age by measuring DNA methylation from a sample of her fins. [8] The study estimated her to be between 92 and 101 years old at the time, far upwards of her previously estimated age of 84. [4] By comparison, the aquarium's two other lungfish were found to be 54 and 50 years old. [8]
Fish account for more than half of vertebrate species. As of 2016, there are over 32,000 described species of bony fish, over 1,100 species of cartilaginous fish, and over 100 hagfish and lampreys. A third of these fall within the nine largest families; from largest to smallest, these are Cyprinidae , Gobiidae , Cichlidae , Characidae ...
Chondrichthyes (/ k ɒ n ˈ d r ɪ k θ i iː z /; from Ancient Greek χόνδρος (khóndros) 'cartilage' and ἰχθύς (ikhthús) 'fish') is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage.
Recruitment of fish is regulated by larval fish survival. Survival is regulated by prey abundance, predation, and hydrology. Fish eggs and larvae are eaten by many marine organisms. [13] For example, they may be fed upon by marine invertebrates, such as copepods, arrow worms, jellyfish, amphipods, marine snails and krill.
Ostariophysi is the second-largest superorder of fish.Members of this superorder are called ostariophysians.This diverse group contains 10,758 species, about 28% of known fish species in the world and 68% of freshwater species, and are present on all continents except Antarctica.
E. burgeri, for example, has nearly a 1:1 ratio, while M. glutinosa females are significantly more common than males. [46] Some species of hagfish are sexually undifferentiated before maturation, and possess gonadal tissue for both ovaries and testis. [ 47 ]