Quick Answer: Which Lineage Has The Largest Number Of Hox Genes Reflecting Their Complex Anatomy?

Which structure is derived from an ancestral air breathing lung in Ray finned fishes and is used to increase buoyancy?

The air bladders of many ray -fins no longer connect to their throats, and so they are not able to breathe air. In these ray -fins, the air bladder is used mainly for buoyancy control and is known as a swim bladder.

Which mammalian lineage contains organisms that lay eggs?

These three groups are monotremes, marsupials, and the largest group, placental mammals. Monotremes are mammals that lay eggs. The only monotremes that are alive today are the spiny anteater, or echidna, and the platypus. They live in Australia, Tasmania, and New Guinea.

Which structure is a covering for the gill chamber in Ray finned fishes?

All bony fishes, like the cartilaginous fishes, use gills to breathe. Water is drawn over gills that are located in chambers covered and ventilated by a protective, muscular flap called the operculum. Unlike sharks, bony fishes have a swim bladder, a gas-filled organ that helps to control the buoyancy of the fish.

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Which feature is a unique derived trait present in all birds?

A derived trait in birds is feathers. The trait is present only in birds and was not inherited from a common ancestor of birds and other organisms.

Is a human a tetrapod?

The term tetrapod refers to four-limbed vertebrates, including humans. Elpistostege, from the Late Devonian period of Canada, is now considered the closest fish to tetrapods (4-limbed land animals), which includes humans.

Do any modern tetrapods have gills?

The common ancestor of the lobe- and ray-finned fishes had lungs as well as gills. Coelacanths and lungfish also retained their gills. Modern tetrapods, on the other hand, bear evidence indicating that we once had gills but that these were lost in the course of our early evolution.

What are 3 types of mammals?

Extant mammals are divided into three subclasses based on reproductive techniques (monotremes, marsupials, and placentals) consisting of 27 orders.

What are the 2 egg-laying mammals?

Only two kinds of egg – laying mammals are left on the planet today—the duck-billed platypus and the echidna, or spiny anteater.

Are humans Amniotes?

Amniotes are a clade of tetrapod vertebrates comprising the reptiles, birds, and mammals. In eutherian mammals (such as humans ), these membranes include the amniotic sac that surrounds the fetus. These embryonic membranes and the lack of a larval stage distinguish amniotes from tetrapod amphibians.

What are the 5 actinopterygii groups?

Actinopterygii is divided into the classes Cladistia and Actinopteri. The latter comprised subclasses Chondrostei and Neopterygii. The Neopterygii, in turn, is divided into the infraclasses Holostei and Teleostei. Actinopterygii.

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Holostei Lepisosteiformes (gars) Amiiformes (bowfins)
275 mya
310 mya

Why are gills rich in blood?

The water enters the mouth and passes through the feathery filaments of the fish’s gills, which are rich in blood. These gill filaments absorb oxygen from the water and move it into the bloodstream. At the same time, waste carbon dioxide in the blood passes out through the gills into the water.

Which perch fin is the largest?

The Order Perciformes is characterized by two dorsal fins, one or two anal spines, and pelvic fins on the ventral, anterior trunk, with the base of the pelvic fin located forward of the pectoral fin. The vertebrae of perch number between 32 and 50; the largest species is the Walleye measuring some 90 cm (3 ft).

What is an example of an ancestral trait?

Members of a large group may share an ancestral trait: e.g. mammals, reptiles, fish, birds share a conspicuous feature (vertebral column). A smaller group is identified by a derived trait not shared by the large group. e.g. mammals are separated from other vertebrates based on milk for their young.

Is a tail a derived trait?

Example: All vertebrates have a bony tail posterior to the anus. It was present in the ancestral vertebrate, and though different vertebrates have evolved differently shaped tails, they are all evolved from the common ancestral tail. The PRESENCE of the tail is primitive.

What is the bird clade called?

All birds through time (beginning with the Late Jurassic Archaeopteryx) belong to the clade Avialae; modern (Cenozoic) birds belong to the clade Aves, also called Neornithes in some of the images from the lecture.

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