The main difference in between Chondrichthyes and Osteichthyes is that the Chondrichthyes is the course of bony fish who endoskeleton is made up of cartilages vice versa, Osteichthyes is the class of cartilaginous fish whose endoskeleton is comprised of bones. Furthermore, Chondrichthyes have the right to only be uncovered in naval water if Osteichthyes can be discovered in both fresh and also marine water.

You are watching: Members of the class chondrichthyes have a bony endoskeleton.

Chondrichthyes and Osteichthyes room the 2 main groups of fish classified based upon the ingredient of the endoskeleton.

Key areas Covered

1. Chondrichthyes – Definition, Characteristics, Behavior 2. Osteichthyes – Definition, Characteristics, Behavior 3. What are the Similarities between Chondrichthyes and also Osteichthyes – synopsis of usual Features 4. What is the Difference in between Chondrichthyes and also Osteichthyes – to compare of key Differences

Key Terms

Chondrichthyes, Osteichthyes, Endoskeleton, Lobe-Finned Fish, Ray-Finned Fish

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Chondrichthyes – Definition, Characteristics, Behavior

Chondrichthyes is the class of cartilaginous fish who exoskeleton is made up of cartilages. Most importantly, Chondrichthyes room only uncovered in naval water. Many Chondrichthyes show a massive growth. The largest cartilaginous fish is the whale shark, i beg your pardon weighs 21.5 tonnes. Some other Chondrichthyes include an excellent white shark, basking shark, thresher shark, skates, and rays. Sharks eat whales, seals, and other fish while skates and also rays eat crabs, shrimps, oysters, clams, etc.


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Figure 1: White Shark


Male Chondrichthyes supplies claspers to understand the female throughout reproduction. Rays space viviparous when skates space oviparous.

Osteichthyes – Definition, Characteristics, Behavior

Osteichthyes is the course of bony fish v an endoskeleton comprised of bones. It sail from Chondrichthyes 420 million years ago. It lives in both freshwater and marine habitats. The largest bony fish is the ocean sunfish or typical mola, i beg your pardon weighs approximately 2.3 tonnes. Ray-finned and lobe-finned fish space the two species of Osteichthyes. Ray-finned fish has actually a single dorsal fin when lobe-finned fish has two dorsal fins.


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Figure 2: Osteichthyes (Epinephelus lanceolatus)


Osteichthyes have actually a rounded body tapered in ~ the ends. This shape is dubbed a fusiform. Osteichthyes have actually both pectoral and pelvic fin in bag while the dorsal, anal, and also tail fins space single. The lateral line the runs v the body is composed of a collection of sensory organs called neuromasts, which help to sense both water pressure and also vibrations.


Similarities in between Chondrichthyes and also Osteichthyes

Chondrichthyes and Osteichthyes room the 2 classes the fish, who room aquatic chordates.Both fish belong come the superclass Pisces.Both have both endoskeleton and also exoskeleton.Breathing that both fish occurs with gills.They have actually a mouth with jaws.Their fins space paired.

Difference in between Chondrichthyes and Osteichthyes

Definition

Chondrichthyes describes a class of fishes that consists of those v a cartilaginous skeleton while Osteichthyes describes a class of fishes that consists of those through a bony skeleton.

Also known as

Chondrichthyes room cartilaginous fish or elasmobranchii while Osteichthyes space bony fish or teleostomi.

Habitat

Furthermore, Chondrichthyes have the right to be exclusively uncovered in marine water when osteichthyes deserve to be discovered in both fresh and also marine water.

Number that Species

More than 970 Chondrichthyes varieties have been identified worldwide while an ext than 27,000 bony fish types have been established worldwide.

Endoskeleton

The endoskeleton of Chondrichthyes is completely made increase of cartilages if the endoskeleton the Osteichthyes is totally made increase of bones.

Exoskeleton

The exoskeleton the Chondrichthyes is made up of very tiny denticles coated with sharp enamel well-known as placoid when the exoskeleton that Osteichthyes is consisted of of slim bony plates well-known as cycloids.

Position that the Mouth

The mouth the Chondrichthyes is ventrally-located if the mouth the Osteichtheys is at the anterior guideline of the body.

Oral Jaw Sets

Also, Chondrichthyes has actually a single collection of jaws when Osteichthyes has two sets of jaws.

Gill Pairs

Moreover, Chondrichthyes has actually 5-7 gill bag while Osteichthyes has actually 4 pairs of gills.

Operculum

The gills the Chondrichthyes are not spanned by an operculum while the gills that Osteichthyes room covered by one operculum.

Air Bladder

Chondrichthyes do not have actually air bladders and also they usage oil-filled liver of buoyancy when Osteichthyes have actually an wait bladder called swim bladder, gas bladder or fish maw.

Tail Fin

The tail fin that Chondrichthyes is heterocercal if the tail fin of Osteichthyes is homocercol.

Mode of Nutrition

Chondrichthyes is generally carnivores when Osteichthyes deserve to be carnivores, omnivores, herbivores, filter-feeders or detritivores.

Fertilization

Some Chondrichthyes undergo inner fertilization while most Osteichthyes undergo outside fertilization.

Excretion

The main excretion kind of Chondrichthyes is urea while Osteichthyes excretes ammonia.

Examples

Some Chondrichthyes encompass skates, sharks, and ray fish when some examples of Osteichthyes room salmon fish, trout, rohu, and seahorse.

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Conclusion

Chondrichthyes room cartilaginous fish whose endoskeleton is made up of cartilages if endoskeleton that Osteichthyes is made up of bones. Also, Chondrichthyes deserve to only be uncovered in the naval water when Osteichthyes stays in both fresh and also marine water. The key difference in between Chondrichthyes and Osteichthyes is the composition of your endoskeleton and habitat.

Reference:

1. “Chondrichthyes – Rays, Sharks, Skates, Chimaeras .” Wildlife newspaper Junior, Available Here2. Manisha, M. “Class Osteichthyes (With Diagram) | Bony Fishes.” biological Discussion, 12 Dec. 2016, Available Here

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