What is a reptiles body covering?

Which best describes similarities that exist between reptiles and amphibians?

They both have gills at some stage in their lives and are endothermic. “They are both vertebrates that lay eggs to reproduce” is the one among the following choices given in the question that best describes similarities that exist between reptiles and amphibians.

How did reptiles and mammals evolve from each other?

Both groups descended from early amniotes (egg-laying tetrapods), probably in the Lower or Middle Carboniferous. The precursors of reptiles are called sauropsids, and the precursors of mammals are called synapsids. The immediate ancestors of the mammals came from a group of therapsids called the cynodonts.

What are the precursors of reptiles and mammals?

The precursors of reptiles are called sauropsids, and the precursors of mammals are called synapsids. The immediate ancestors of the mammals came from a group of therapsids called the cynodonts. There are a number of characteristics which cannot be seen on fossils, but which are of great importance.

Which of the following is an example of protostome?

Because the coelom is formed by breaking the solid mass of the embryonic mesoderm, protostomes are referred to as schizocoelomates. Examples of protostomes include leeches, insects (beetles, ants, flies, crickets, butterflies, flees, cicada, bees), Centipedes and millipedes, Squid, etc.

Which annelid feature “relates” best to mollusks?

The annelid feature that “relates” best to mollusks is the A. degree of specialization of the nervous system. B. lack of development of an excretory system.

Is Arthropoda a protostome or deuterostome?

Ans. Protostomia and Deuterostomia are super-phyletic taxa that include a wide range of animal phyla. The Annelida, Arthropoda, and Mollusca are traditionally protostomes, while the Echinoderms and Chordates are deuterostomes. Ques. What is the significance of the Deuterostome? (3 marks)

What is the most mammal-like reptile?

The term “mammal-like reptiles” is most commonly used to describe the group Therapsida, although it can be also used more broadly to describe non-mammalian Synapsids. The Cynodonts were the most mammal-like of the Therapsids. Probably the most famous mammal-like reptile is Dimetrodon, which is often wrongly described as a dinosaur.

Where did mammals and Reptiles come from?

Mammal-like reptile. Both groups descended from early amniotes (egg-laying tetrapods ), probably in the Lower or Middle Carboniferous. The precursors of reptiles are called sauropsids, and the precursors of mammals are called synapsids. The immediate ancestors of the mammals came from a group of therapsids called the cynodonts.

What gave rise to the first mammals?

These are the “mammal-like amniotes”, or stem-mammals, that later gave rise to the true mammals. Soon after, another group evolved a similar trait, this time with a double opening behind each eye, earning them the name Diapsida (“two arches”).

Are most animals deuterostomes or protostomes?

Most animals are either deuterostomes or protostomes, with some minor exceptions. One exception can be seen in sponges, which belong to the phylum Porifera. Sponges do not have a mouth or anus, which are two features that help to define both deuterostomes and protostomes.

Are sponges deuterostomes or protostomes?

One exception can be seen in sponges, which belong to the phylum Porifera. Sponges do not have a mouth or anus, which are two features that help to define both deuterostomes and protostomes.

What is the difference between anus of protostome and deuterostome?

The anus or anal pore of protostomes develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development. B. Protostomes are animals in which the anus develops from the blastopore. The mouth of protostomes develops from the second opening.

What are protostomes?

Protostomes is any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate and the coelom forms as a splitting of the mesoderm. Examples of protostomes include:

How is the coelom normally produced in protostomes?

E. The coelom is normally produced by an invagination of the archenteron. 2. Of the following combination of statements about protostomes and deuterostomes, which choice is correct? A. Protostomes are animals in which the mouth develops from the blastopore. The anus or anal pore of protostomes develops from the second opening.

What is the body plan of annelids?

Annelids have a body plan with metameric segmentation, in which several internal and external morphological features are repeated in each body segment. Metamerism allows animals to become bigger by adding “compartments,” while making their movement more efficient. The overall body can be divided into head, body, and pygidium (or tail).

What are the characteristics of mollusks?

Mollusks are soft bodied invertebrate animals that belong to the phylum mollusca. These are the second largest phylum animals after the arthropoda. This group contains more than 70,000 species which includes snails, octopuses, squids, and clams. Most of the mollusks have an external hard shell to protect their soft skin like organs.

What is the phylum of annelids?

Annelids. Annelids are a large Phylum of Segmented Worms, with over 17,000 modern Species including Ragworms, Earthworms and Leeches. Annelids are considered members of the Lophotrochozoa, a ‘Super-Phylum’ of Protostomes that also includes Molluscs, Brachiopods, Flatworms and Nemerteans.

How did mammals become the dominant animal on land?

One branch would become the modern reptiles and the birds, the other the mammals. The ancestors of the mammals were at one time the dominant animals on land. However, after two devastating extinction events, the early mammals’ hold on the land was weakened. During the Triassic Period the reptiles became dominant.

What is the form of nitrogenous waste in reptiles?

Among reptiles the form taken by the nitrogenous wastes is closely related to the habits and habitat of the animal. Aquatic reptiles tend to excrete a large proportion of these wastes as ammonia in aqueous solution.

What is the difference between Bilateria and deuterostome?

Deuterostome is a sister clade of Protostomes. Bilateria is a group under subkingdom Eumetazoa, which has triploblastic animals with bilateral symmetry. On the basis of difference in embryonic development, they are further divided into superphylum, Protostomia and Deuterostomia.

Why are vertebrates considered protostomes?

We probably consider them (and specifically the vertebrates) important mainly for anthropocentric reasons (we are deuterostomes). The Protostomes in contrast include the great majority of animal species, such as arthropods, molluscs, annelids, and many less well-known taxa.

What are protostomes and deuterostomes?

Ans. Based on how they develop as embryos, most invertebrates (and higher animals) can be divided into two classes. Protostomes and deuterostomes are the names for the two groups. The protostomes include mollusks, annelids, and arthropods. The deuterostomes are echinoderms and chordates.

What does the blastopore in a protostome develop into?

The blastopore in a protostome develops into a mouth. Protostomes are referred to as schizocoelomates because the coelom is developed by splitting of the solid mass of the embryonic mesoderm. In protostomes, the gut is tunneled into embryo and forms anus.