bony fish.
The bony fish are divided into two classes: ray-finned fish and lobe-finned fish. The bony fish are characterized by a lung or swim bladder, a cover over the gill called the operculum, and a head and pectoral girdles covered with bones derived from the skin.
Which fish have swim bladder operculum?
Bony fish also have an operculum. The operculum is a bony flap of skin over their gills that protects the gills. It opens and closes to help bony fish breathe when they are not swimming. Bony fish have scales, and most species have a fusiform body design.
In which fishes the operculum is present?
The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills; it is also used for respiration and feeding.
Is operculum present in Chondrichthyes?
In cartilaginous fishes, gill slits are separate and without operculum (gill cover). Bony fishes possess gill slits that are covered by an operculum.
Do all fish have an operculum?
All fish having gills are not covered by operculum. Operculum is present in bony fish, hence forms gill covering for bony fish. Operculum is series of bones. It provides facial structure to bony fish.
What groups have an operculum?
The operculum is a large flap consisting of several flat bones that covers and protects the gills, and which is found throughout the actinopterygians. Within extant sarcopterygians, however, it is found in coelacanths and lungfish but not in tetrapods.
Does labeo have operculum?
Labeo, Exocoetus and Betta are bony fishes and and possess operculum.
Do Seahorses have operculum?
A bony structure known as the operculum covers the gills of most fish species, leaving crescent-shaped openings at the sides of the head. In the seahorse, this structure is reduced to a narrow opening located at the back of the head.
Does class Chondrichthyes have a swim bladder?
Chondrichthyes are a taxonomic class of cartilaginous fishes that encompass sharks and rays (elasmobranchs) and chimaera. Though there are exceptions, in general, Chondrichthyes have exposed gills, no swim bladder, internal fertilization, and placoid denticles.
Do sharks have an operculum?
Members of the class Chondricthyes, including sharks, skates and rays, have skeletons made of cartilage, and therefore do not have a bony operculum. Instead, they have 5-7 exposed gill slits.
Which type of fish do not have operculum?
Cartilagenous fishes
Cartilagenous fishes lack an operculum. Q. In cartilaginous fishes, gill slits are covered by an operculum.
What are the example of Osteichthyes?
Bony fishesLower classifications
What are the differences between Chondrichthyes and Osteichthyes?
The main difference between Chondrichthyes and Osteichthyes is that the Chondrichthyes is the class of bony fish whose endoskeleton is made up of cartilages whereas Osteichthyes is the class of cartilaginous fish whose endoskeleton is made up of bones.
Do sharks have a swim bladder?
All sharks are slightly negatively buoyant, which means they sink. Unlike many bony fishes, sharks do not have a swim bladder to provide buoyancy. To help compensate for their tendency to sink, their livers contain large amounts of oil that is less dense than seawater.
Do bony fish have swim bladder?
Osteichthyes (bony fish) use swim bladders that are filled with oxygen taken in by their gills. The more air in the swim bladder the more buoyant the fish and the less air in the swim bladder the less buoyant the fish. The swim bladder is similar to human lungs in the way that it expands and deflates.
Which organism is the only type to have an operculum?
The operculum is present in the larval stage of most gastropods; however, only specific gastropods keep the operculum into their adult stage.
Do all gastropods have an operculum?
The word operculum is derived from Latin and means a cover or lid, which is exactly how marine snails use it. Although not all gastropods have this calcareous structure, nearly all of the ocean-dwelling species do.
Why do some fish have operculum?
Operculum: The operculum is the bony flap that protects the gills from harm. It opens and closes to allow water to pass over the gills.
Where is the operculum found?
The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of “trapdoor” to close the aperture of the shell when the soft parts of the animal are retracted.
Do whales operculum?
This pupil shape is characteristic of many dolphins and whales, although in several whales the operculum is small. A known exception is the Amazon river dolphin which has a round pupil even when it is constricted.
Do Rohu fish have teeth?
Two nostrils are present on the dorsal side of the snout. The mouth is a crescentic transverse opening bounded by thick fringed lips. Teeth are absent in the jaws.