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3 天前 · Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., cusk-eels and snailfish ), although none have been found in the deepest 25% of the ocean. [31]
4 天前 · Shark. † Synechodontiformes. Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea ( rays and kin).
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1 天前 · A dog with rabies, a zoonosis. A zoonosis ( / zoʊˈɒnəsɪs, ˌzoʊəˈnoʊsɪs /; [1] plural zoonoses) or zoonotic disease is an infectious disease of humans caused by a pathogen (an infectious agent, such as a bacterium, virus, parasite, or prion) that can jump from a non-human (usually a vertebrate) to a human and vice versa. [1] [2] [3]
4 天前 · Ichthyosauria ( / ˌɪkθiəˈsɔːriə /; Ancient Greek for "fish lizard" – Ancient Greek: ἰχθύς, romanized : ichthys, lit. 'fish' and Ancient Greek: σαῦρος, romanized : sauros, lit. 'lizard') is an order of large extinct marine reptiles sometimes referred to as "ichthyosaurs", although the term is also used for wider clades in which the order resides.
14 小時前 · Mollusca is the second-largest phylum of invertebrate animals, after Arthropoda; members are known as molluscs or mollusks [a] ( / ˈmɒləsks / ). Around 76,000 extinct species of molluscs are recognized. [3] The number of fossil species is estimated between 60,000 and 100,000 additional species. [4] The proportion of undescribed species is ...
1 天前 · Etymology The term sponge derives from the Ancient Greek word σπόγγος spóngos. Overview Sponge biodiversity and morphotypes at the lip of a wall site in 60 feet (20 m) of water. Included are the yellow tube sponge, Aplysina fistularis, the purple vase sponge, Niphates digitalis, the red encrusting sponge, Spirastrella coccinea, and the gray rope sponge, Callyspongia sp.
3 天前 · Formation The Amu Darya river flowed into the Caspian Sea via the Uzboy Channel until the Holocene.Geographer Nick Middleton believes it did not begin to flow into the Aral Sea until that time.[13] [14] Ecology The Syr Darya sturgeon (Pseudoscaphirhynchus fedtschenkoi) was a primitive species of fish possibly driven to extinction by the shrinkage of the Aral Sea.
