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In biology, an identification key, taxonomic key, or frequently just key, is a printed or computer-aided device that aids in the identification of biological organisms. Historically, the most common type of identification key is the dichotomous key , a type of single-access key which offers a fixed sequence of identification steps, each with ...
tropical zones of major seas and oceans Diodon hystrix Linnaeus, 1758 Spot-fin porcupinefish: tropical and subtropical waters of the world, including the Mediterranean Sea Diodon liturosus G. Shaw, 1804: Black-blotched porcupinefish: tropical and subtropical waters of the Indo-Pacific area from eastern coasts of Africa to Japan
In phylogenetics, a single-access key (also called dichotomous key, sequential key, analytical key, [1] or pathway key) is an identification key where the sequence and structure of identification steps is fixed by the author of the key. At each point in the decision process, multiple alternatives are offered, each leading to a result or a ...
In biology or medicine, a multi-access key is an identification key which overcomes the problem of the more traditional single-access keys (dichotomous or polytomous identification keys) of requiring a fixed sequence of identification steps.
In a diagnostic key, the branching structure of the key should not be mistaken for a phylogenetic or cladistic branching pattern. All single-access keys form a decision tree (or graph if reticulation exists), and thus all such keys have a branching structure. "Branching key" may therefore occasionally be used as a synonym for single-access key.
Dascyllus melanurus, known commonly as the four stripe damselfish, blacktail dascyllus, humbug damselfish, blacktail damselfish, and blacktail humbug, is a species of fish in the family Pomacentridae. It is native to the western Pacific Ocean. It is sometimes kept as an aquarium pet. [1]
Cheilodipterus macrodon, the large-toothed cardinalfish , or tiger cardinalfish is a species of marine fish in the family Apogonidae. It is widespread throughout the tropical waters of the Indo-Pacific region, Red Sea included. [1] The large-toothed cardinalfish can reach a maximum size of 25 cm in length, [2] and live at depths of 1-40m. [3]
Tropical fish is a term commonly used to refer to fish that are kept in heated aquariums. Freshwater tropical fish are more commonly kept than saltwater tropical fish due to the common availability of fresh water sources, such as tap water, whereas salt water is not commonly available and has to be recreated by using fresh water with sea salt additions.