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Acanthomorphs have developed spiny ctenoid scales (as opposed to the cycloid scales of other groups), tooth-bearing premaxilla and greater adaptations to high speed swimming. [ 5 ] The adipose fin , which is present in over 6,000 teleost species, is often thought to have evolved once in the lineage and to have been lost multiple times due to ...
The following diagnostic systems and rating scales are used in psychiatry and clinical psychology. This list is by no means exhaustive or complete. This list is by no means exhaustive or complete. For instance, in the category of depression, there are over two dozen depression rating scales that have been developed in the past eighty years.
Ctenoid scales can be further subdivided into three types: Crenate scales, where the margin of the scale bears indentations and projections. Spinoid scales, where the scale bears spines that are continuous with the scale itself. True ctenoid scales, where the spines on the scale are distinct structures. Most ray-finned fishes have ctenoid scales.
Lanternfish typically have a slender, compressed body covered in small, silvery deciduous cycloid scales (ctenoid in four species), a large bluntly rounded head, large elliptical to round lateral eyes (dorsolateral in Protomyctophum species), and a large terminal mouth with jaws closely set with rows of small teeth.
Keeled scales of a colubrid snake (banded water snake; Nerodia fasciata). In zoology, a scale (Ancient Greek: λεπίς, romanized: lepís; Latin: squāma) is a small rigid plate that grows out of an animal's skin to provide protection.
A catenoid A 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]
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The teeth are small and brushlike, and there are no teeth on the roof of the mouth. The head and fins are covered with ctenoid scales. Specimens commonly weigh from 3 to 10 pounds (1.4 to 4.5 kg), although individuals as large as 20 pounds (9.1 kg) have been recorded. [8] Their maximum length is about 36 inches (91 cm).