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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.
These scales are classified as leptoid scales. The leptoid scales are thin and flexible and cover the extent of the body. Leptoid scales are divided in two groups of specificity. The finescale dace has what are called ctenoid scales, called this because of the cteni that run along the posterior area of the fish. A lateral line system exists on ...
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.
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 scales are mainly ctenoid, although there are non-ctenoid scales typically in the underside and on the back near the head. The upper lateral line has tubed scales which may be reduced in extent and in the middle lateral line the tubed scales are frequently often replaced by pored scales. The caudal fin contains10-14 branched fin rays. [3]
Saxatilia differs from Crenicichla (subgenus Crenicichla) by the presence (or absence) of an eye spot on the caudal fin and by cycloid (vs. ctenoid) scales on the cheeks and chest area. Saxatilia differs from Crenicichla (subgenus Batrachops) by the absence of a reticulate colour pattern on the sides of the body.
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The scales are ctenoid and their width is greater than the length. The colour is pink or dusky pink with contrasting dark blue pectoral fins which have pink bases. [ 7 ] The maximum published total length of this species is 20 cm (7.9 in), although 12.5 cm (4.9 in) is more typical.