Where does the word Ctenoid come from what does it mean?

First recorded in 1830–40, ctenoid is from the Greek word ktenoeidḗs like a comb. See cteno-, -oid.

What are Ctenoid scales?

Ctenoid scales resemble cycloid scales but have comblike teeth on their overlapping edge. In integument: Fishes. Ctenoid scales are similar to cycloid, except that they have spines or comblike teeth along their free edges; these scales are characteristic of the higher bony fishes—perches and sunfishes, for example.

What is the difference between Placoid and Ctenoid scales?

As adjectives the difference between placoid and ctenoid is that placoid is platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids while ctenoid is having a toothed margin, usually fish scales.

What class of fish has Ctenoids?

Ctenoid scales are scales with comb-like edge found in higher order teleost fishes, such as perch and sunfish. Cteni are the tiny teeth on the posterior margin of the scale. Similar to cycloid scales, they are overlapping which allows for greater flexibility in movement than other types of scales such as ganoid scales.

What does the word Hypocycloid mean?

Definition of hypocycloid : a curve traced by a point on the circumference of a circle rolling internally on the circumference of a fixed circle.

Why do fish have Ctenoid scales?

What is the difference between cycloid and Placoid scales?

Placoid scales are predominantly found in cartilaginous fish such as sharks. Cycloid scales are more commonly found on bony fishes.

What is the meaning of ctenoid?

Definition of ctenoid. : having the margin toothed ctenoid scale also : having or consisting of ctenoid scales ctenoid fishes.

How does a ctenoid scale differ from other scales?

A ctenoid scale differs in having its posterior margin pectinate. Louis Agassiz distinguished four kinds of scales—placoid, ganoid, cycloid and ctenoid. There are two principal types of Teleostean scales, the cycloid and ctenoid.

What are the cycloid and ctenoid scales of teleosteans?

The cycloid and ctenoid scales of Teleosteans (see p. 105) are thin plates coated with epidermis. The exoskeleton is sometimes absent but generally consists of overlapping cycloid or ctenoid scales. A ctenoid scale differs in having its posterior margin pectinate.

What does ktenoeidḗs mean?

1. comblike or pectinate; rough-edged. 2. having rough-edged scales. [1830–40; < Greek ktenoeidḗs like a comb. See cteno -, -oid] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc.