Ctenoid scales. Ctenoid (toothed) scales are like cycloid scales, except they have small teeth or spinules called ctenii along their outer or posterior edges. Because of these teeth, the scales have a rough texture. They are usually found on fishes with spiny fin rays, such as the perch-like fishes. See more A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection See more Cosmoid scales are found only on ancient lobe-finned fishes, including some of the earliest lungfishes (subclass Dipnoi), and in Crossopterygii, … See more Ganoid scales are found in the sturgeons, paddlefishes, gars, bowfin, and bichirs. They are derived from cosmoid scales and often have serrated … See more Placoid (pointed, tooth-shaped) scales are found in the cartilaginous fishes: sharks, rays. They are also called dermal denticles. Placoid scales are structurally homologous with vertebrate teeth ("denticle" translates to "small tooth"), having a central See more The bony scales of thelodonts, the most abundant form of fossil fish, are well understood. The scales were formed and shed throughout the organisms' lifetimes, and quickly separated after their death. Bone, a tissue that is both resistant to mechanical … See more Elasmoid scales are thin, imbricated scales composed of a layer of dense, lamellar collagen bone called isopedine, above which is a layer of tubercles usually composed of bone, as in Eusthenopteron. The layer of dentine that was present in the first lobe-finned … See more Leptoid (bony-ridge) scales are found on higher-order bony fish, the teleosts (the more derived clade of ray-finned fishes). The outer part of these scales fan out with bony ridges while the inner part is criss-crossed with fibrous connective tissue. Leptoid scales are … See more Web鳞 ，又称 鳞片 ，是一些 动物 皮肤 表面衍生的硬薄片状结构，有保护作用。 鳞见于 鱼类 、 爬行动物 ，一些 哺乳动物 的部分或全部体表，以及 鸟类 的足部。 鱗翅目 昆虫的翅膀表面也覆盖有细微的鳞片结构，肉眼下类似粉状，也称 鱗粉 。 另外，鳞也被用来形容其他密集排列，类似鱼鳞的片状结构，如 鳞茎 、 鳞状上皮细胞 等。 目录 1 鱼类的鳞 1.1 盾鳞 1.2 硬 …

Blackchin shiner - Wikipedia

WebOct 20, 2012 · Sisik ctenoid memiliki tonjolan pada tepi sisik yang berfungsi sebagai alat pertahanan dari predator yang mencoba menyerang ikan. Sedangkan, sisik cycloid memiliki tepi yang rata atau bulat dan tidak memiliki tonjolan. Selain itu, sisik cycloid juga lebih halus dibandingkan dengan sisik ctenoid. thep829.cc

Ctenoid scale anatomy Britannica

WebWikipedia They possess 24 to 30 ctenoid scales on the body, becoming cycloid on the nape before disappearing just behind the eyes. De Wikipedia The body is covered in … WebBlackchin shiner. The blackchin shiner ( Notropis heterodon) is an abundant North American species of freshwater fish from the family Cyprinidae. Described by Edward Drinker Cope in 1865, it is not a well-known species. It is a close relative of the blacknose shiner. Chiefly occurring now in the Great Lakes and occasionally in upper Mississippi ... WebA catenoid obtained from the rotation of a catenary. In geometry, a catenoid is a type of surface, arising by rotating a catenary curve about an axis (a surface of revolution ). [1] It is a minimal surface, meaning that it occupies the … thep801.cc