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Ozark Bass
The Ozark bass (''Ambloplites constellatus'') is a species of freshwater fish in the sunfish family (Centrarchidae) of order Perciformes. It is native only to the White River, Sac River, James River, and Pomme de Terre river drainages of Missouri and Arkansas.the species is commonly referred to as “goggle-eye”. Description The Ozark bass is a comparatively slender species of rock bass with a large eye which has a red iris. The brownish-green body has an irregular pattern of black-speckling. This species attains a maximum total length of but they are normally around and the maximum published weight is . Distribution The Ozark bass is native to the Ozarks upland reaches of the White River system in Missouri and Arkansas. They have been introduced elsewhere but have failed to establish populations in these areas. Habitat and biology The Ozark bass occurs in creeks and small to medium permanent rivers with high levels of dissolved oxygen, plentiful aquatic vegetation, lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Cashner
Robert C. Cashner is an American ichthyologist and retired academic administrator. He was the first to describe the Stippled studfish (''Fundulus bifax'') and the bluefin stoneroller (''Campostoma pauciradii''). Cashner was a faculty member at the University of New Orleans for many years. He was dean of UNO's graduate school from 1996 to 2008 and vice chancellor for research from 2001 to 2008. He was elected as president of the American Society of Ichthyologists and Herpetologists The American Society of Ichthyologists and Herpetologists (ASIH) is an international learned society devoted to the scientific studies of ichthyology (study of fish) and herpetology (study of reptiles and amphibians). The primary emphases of the ... in 1997. Taxon described by him *See :Taxa named by Robert Cashner Selected publications * * *Cashner, R.C., J.S. Rogers and J.M. Grady 1988 ''Fundulus bifax'', a new species of the subgenus Xenisma from the Tallapoosa and Coosa river systems of Alab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iris (eye)
In humans and most mammals and birds, the iris (plural: ''irides'' or ''irises'') is a thin, annular structure in the eye, responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. Eye color is defined by the iris. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm. Structure The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, beneath the stroma, pigmented epithelial cells. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds. The sphincter pupillae is the opposing muscle of the dilator pupillae. The pupil's diameter, and thus the inner border of the iris, changes size when constricting or dilating. The outer border of the iris does not change size. The constrictin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By Robert Cashner
In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established. It is very common, however, for taxonomists to remain at odds over what belongs to a taxon and the criteria used for inclusion. If a taxon is given a formal scientific name, its use is then governed by one of the nomenclature codes specifying which scientific name is correct for a particular grouping. Initial attempts at classifying and ordering organisms (plants and animals) were set forth in Carl Linnaeus's system in ''Systema Naturae'', 10th edition (1758), as well as an unpublished work by Bernard and Antoine Laurent de Jussieu. The idea of a unit-based system of biological classification was first made widely available in 1805 in the intro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Described In 1977
Fish are Aquatic animal, aquatic, craniate, gill-bearing animals that lack Limb (anatomy), limbs with Digit (anatomy), digits. Included in this definition are the living hagfish, lampreys, and Chondrichthyes, cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a vertebrate, true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed placodermi, external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
