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
.
Are ray-finned fishes the largest group of vertebrates?
The most diverse group of fish
The ray-finned fishes (actinopterygians) are the largest group of living fishes and
compose half of the living vertebrates
.
What type of fish is a ray-finned fish?
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.
Is a stingray vertebrate or invertebrate?
The stingray “is the only
vertebrate
we’ve documented that has seasonal changes in tooth shape,” Kajiura said. The male stingray uses its sharper teeth to secure himself to a mate during reproduction, as stingrays are rather slippery.
What is the difference between ray-finned fish and lobe-finned fish?
Answer. ❏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. There are two types of living lobe-finned fish: the coelacanths and the lungfish.
Are rays vertebrates?
The 50,000 species of living vertebrates are placed in nine classes: hagfish, lampreys, cartilaginous fish,
ray-finned fish
, lobe-finned fish, amphibians, reptiles, birds, and mammals.
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.
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- produc ing) glands; they are endothermic.
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.
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 endangered?
Not extinct
Are ray-finned fish ectothermic or endothermic?
Ray-Finned Fish
They have a backbone and jaws; their endoskeleton is made of bones; they have thin, bony fins;
they are ectothermic
.
Are ray-finned fish Oviparous?
In nearly all ray-finned fish, the sexes are separate, and
in most species the females spawn eggs that are fertilized externally, typically with the male inseminating the eggs after they are laid
. Development then proceeds with a free-swimming larval stage.
Do ray-finned fish have Claspers?
Teeth in a single series of a few tooth plates along each jaw ramus (half); pectoral with 2, and pelvic fins with 1 basal element;
pelvic fin claspers present
; dermal armour frequently present on head; primitive forms with placoid scales covering body, lost in certain advanced forms; scales specialized in some; dorsal …
Are fish vertebrates or invertebrates?
Fish are considered
vertebrates
(with a backbone), and most fish have scales, fins, and gills. Fish use their gills to breathe, but some types of fish have lungs as well, and can breathe out of water for long periods of time.
Is stingray a fish or mammal?
Stingrays are a group of sea rays, which are
cartilaginous fish
related to sharks.
Is a stingray a cartilaginous fish?
Cartilaginous fish are fish that have a skeleton made of cartilage, rather than bone.
All sharks, skates, and rays (e.g., the southern stingray) are cartilaginous fish
. These fish all fall into the group of fish called the elasmobranchs.
How cartilaginous fishes differ from bony fishes?
What is the difference between bony and cartilaginous fish?
Cartilaginous fishes have skeletons composed mostly of cartilage while bony fish have a skeleton composed mostly of bone
.
What is the difference between fish that are classified as Actinopterygii and those classified as Sarcopterygii?
The key difference between sarcopterygii and actinopterygii relies mainly on their fin structure.
Sarcopterygii fish species have lobed fins, while the actinopterygii fish species have ray fins
. Moreover, the rate of extinction in sarcopterygii is higher in comparison to actinopterygii.
Which is a lobe-finned fish?
The Sarcopterygii, or lobe-finned fishes, is
a clade containing the coelacanths, lungfishes, tetrapods, and their fossil relatives, including the osteolepiformes and panderichthyids
. They are the sister group to the ray-finned fishes (Actinopterygii), together forming the bony fishes (Osteichthyes).
Are rays invertebrates?
2.
Manta rays are the only vertebrate animals
with three paired appendages: two wing-like pectoral fins; two sets of gills; and two lobes that extend from the mouth and funnel in water.
Do rays have fins?
Stingrays are members of the group of fish that also includes sharks and skates. Sharks and rays have skeletons made of flexible cartilage instead of bone. What makes rays unusual is that
their wing-like fins stretch out flat from their bodies, making them look like a disc with a tail.
Are all rays considered to be stingrays?
Are all rays considered to be stingrays? Stingrays are a type of ray, however
not all rays are stingrays
as this group also includes electric rays, butterfly rays, round rays, manta rays, guitarfish, and sawfish.
How are bones arranged in a ray fin?
Ray-fins have bones arranged in
a fan shape
, while lobe-fins have bony supports.
