The actinopterygians, or ray-finned fish, are one of the two major clades of bony fish (Osteichthyes), the other being the lobe-finned fish, or Sarcopterygians. The Chondrichthyes (cartilaginous fish) are the extant sister clade of the Osteichthyes.
How do cartilaginous fishes differ from ray-finned fish?
Technically, the most obvious disparity between bony vs cartilaginous fish comes from the fact that the skeleton of bony fish is made of bones alone, while that of cartilaginous fish is made of cartilage . There are more than 20,000 fish species in the world.
What are 3 examples of cartilaginous fish?
- Whale Shark.
- Basking Shark.
- Great White Shark.
- Thresher Sharks.
- Skates.
- Southern Stingray.
What class do ray-finned fish belong?
| Ray-finned fish Temporal range: Late Silurian–Present, | Phylum: Chordata | Superclass: Osteichthyes | Class: Actinopterygii Klein, 1885 | Subclasses |
|---|
Do ray-finned fish have four limbs?
They have a backbone and jaws; their endoskeleton is made of bones; they have thick, fleshy fins; they are ectothermic. They have a bony endoskeleton with a backbone and jaws; they breathe only with lungs; they have four limbs ; their skin is covered with scales; they have amniotic eggs; they are ectothermic.
Do ray-finned fish have vertebrae?
Most actinopterygians have complex skeletons of true bone (sturgeons and paddlefishes are exceptions). Ray-finned fishes are the dominant aquatic vertebrates today, making up about half of all vertebrate species known .
What are the characteristics of ray-finned fish?
The anatomy of ray-finned fish shows many of the characteristics common to all chordates: pharyngeal slits, a nerve cord, and body wall muscles arranged in myotomes, or segmented blocks . Ray-finned fish also have several unique anatomical features that suggest adaptation for an aquatic lifestyle.
What features distinguish ray-finned fishes from sharks?
Rays and skates comprise more than 500 species. They are closely related to sharks but can be distinguished from sharks by their flattened bodies, pectoral fins that are enlarged and fused to the head, and gill slits on their ventral surface ((Figure)).
What are two differences between cartilaginous fishes and bony fishes?
However, cartilaginous fish lives exclusively in marine water. Both types of fish have an endoskeleton. The main difference between bony fish and cartilaginous fish is that bony fish have an endoskeleton completely made up of bones whereas cartilaginous fish have an endoskeleton primarily made up of cartilages .
Is Starfish a cartilaginous fish?
Answer. Answer: Though starfish are invertebrate , they have a kind of skeleton formed of calcium carbonate.
Is shark a cartilaginous fish?
Cartilaginous skeleton
Sharks, rays, skates, and chimaeras (also know as rat fishes) all have cartilaginous skeletons . Cartilage is less dense than bone, allowing sharks to move quickly through the water without using too much energy.
What are the 4 types of cartilaginous fishes?
The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or ratfishes . A diverse group comprising more than 700 species, Chondrichthyans are found throughout the world’s oceans and in some freshwater environments.
Are ray-finned fish tetrapods?
Tetrapods evolved from a finned organism that lived in the water. However, this ancestor was not like most of the fish we are familiar with today. Most animals we call fishes today are ray-finned fishes , the group nearest the root of this evogram.
Are ray-finned fish carnivores?
Some species are planktonic feeders, however most are carnivores , feeding on other fish and crustaceans and have well developed canine-like teeth.
What is the definition of lobe-finned fish?
Lobe-finned-fish definition
Any of various fishes of the class Sarcopterygii, having paired fins that are rounded and fleshy, suggesting limbs . One group of lobe-finned fish are thought to be ancestors of amphibians and other land-dwelling vertebrate animals.
Do ray-finned fish have paired fins?
Ray-finned fish have a true vertebral column (or backbone), paired fins , and scales. So what exactly is a “ray-fin?” Ray fins consist of webs of skin tissue supported by flexible, bony rays or spines. These fins are not muscularized, so their movements are dictated by body muscles.
How are bones arranged in a ray fin?
Ray-fins have bones arranged in a fan shape , while lobe-fins have bony supports.
Do ray-finned fish have hair?
They have a bony endoskeleton with a backbone and jaws; they breathe only with lungs; they have four limbs; their skin is covered with hair or fur ; they have amniotic eggs; they have mammary (milk-producing) glands; they are endothermic.
Is a lion fish a ray-finned fish?
The common lionfish, also known as the devil firefish, is a species of ray-finned fish native to the western Indo-Pacific region.
Are ray-finned fish endangered?
Not extinctIs a stingray an invertebrate or vertebrate?
Though it is similar in shape to a horseshoe crab, the stingray does indeed have a backbone.
Do ray-finned fish have an Operculum?
They do not have fin spines, but instead support the fin with lepidotrichia (bone fin rays). They also have an operculum , which helps them breathe without having to swim.
What is the major difference between rays and skates?
Most rays are kite-shaped with whip-like tails possessing one or two stinging spines while skates have fleshier tails and lack spines . Rays protect themselves with these stinging spines or barbs while skates rely on thorny projections on their backs and tails to for protection from predators.
What is the difference between lobe and ray-finned fish?
The ray-finned fish have fin rays, with fins supported by bony spines known as rays. The lobe-finned fish are characterized by fleshy lobed fins, as opposed to the bony fins of the ray-finned fish .
How bony fishes differ from sharks and rays?
Bony fish differ from fish like sharks and rays in the chondrichthyes class. Instead of cartilage, bony fish have bones . Bony fish also have a swim bladder. The swim bladder is a gas-filled sac that helps keep bony fish buoyant!
Which group of fish include sharks rays and skates?
chondrichthyan, (class Chondrichthyes), also called chondrichthian , any member of the diverse group of cartilaginous fishes that includes the sharks, skates, rays, and chimaeras.
