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Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy.Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1]
Argulus foliaceus. Argulus foliaceus, also known as the common fish louse, is a species of fish lice in the family Argulidae. [1] It is "the most common and widespread native argulid in the Palaearctic" [2] and "one of the most widespread crustacean ectoparasites of freshwater fish in the world", considering its distribution and range of hosts. [3]
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups.Ambiguous common names are accompanied by their possible meanings.
The family Argulidae, whose members are commonly known as carp lice or fish lice, are parasitic crustaceans in the class Ichthyostraca. It is the only family in the monotypic subclass Branchiura and the order Arguloida , although a second family, Dipteropeltidae, has been proposed.
Lagodon is a monospecific genus of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies. The only species in the genus is Lagodon rhomboides, the pinfish, red porgy, bream, pin perch, sand perch, butterfish or sailor's choice. This fish is found in the Western Atlantic Ocean and Gulf of Mexico.
P. notatus has wide pectoral fins and a narrow but rounded tail fin. [3] There are four lateral lines on the head and sides of the body. [2] Adult plainfin midshipman. It has 33-38 soft rays in the long second dorsal fin, 30-35 anal rays, and 17 - 20 pectoral rays. [2] The length of the fish varies from female to males.
In a 2019 study, cleaner wrasses passed the mirror test, the first fish to do so. [27] However, the test's inventor, American psychologist Gordon G. Gallup, has said that the fish were most likely trying to scrape off a perceived parasite on another fish and that they did not demonstrate self-recognition. The authors of the study retorted that ...
The Black-blotched porcupinefish is a medium-sized fish which grows up to 65 cm (26 in), but the average size most likely to be observed is 45 cm (18 in). [1] Its body is elongated with a spherical head with big round protruding eyes and a large mouth that is rarely closed.