What is the main difference between metamerism and tagmatization?

Metamerism produces specialization in regions of the body for specific functions. The regional specialization is called tagmatizafion. In arthropods,, body regions are called tagmata, tagmata are specialized for feeding and sensors perception, locomotion and visceral functions.

The segmentation of Arthropod bodies is different from that of Annelids in that They consist of subsections composed of fused segments referred to as tagmatization. Tagmata are the specific sections (i.e. Head, Thorax, Abdomen), which may vary from species to species.

In the ancestral arthropod, the body was made up of repeated segments, each with similar internal organs and appendages. One evolutionary trend is the grouping together of some segments into larger units, the tagmata. The evolutionary process of grouping Is called tagmosis (or tagmatization).

In true metamerism, the segments work together for the whole organism whereas in pseudometamerism each of the repeating segments may act independently from each other. An example of true metamerism is that of earthworms whereas an example of pseudometamerism is that of tapeworms.

F) tagmatization- The body has blocks of segments (tagmata), distinct from other blocks of segments, that perform different functions. 2) Ph. ANNELIDA includes approx. 17,000 marine, freshwater and terrestrial spp. a) long, fully segmented worms with complete gut and terminal anus.

An example is The head of Euarthropoda. Traditionally, a six-segmented head was assumed to have been present in the ground pattern of Euarthropoda, because at least six head segments occur in extant crustaceans, insects, myriapods and chelicerates (ocular segment plus at least five appendage-bearing segments).

Definition of metamerism

1 : The condition of having or the stage of evolutionary development characterized by a body made up of metameres The basic principle of arthropod design is metamerism, the construction of the body from an extended series of repeated segments.— Stephen Jay Gould.

But Some annelids also display tagmatization. Because of this similarity the annelids and arthropods are closely related. Other common features between arthropods and annelids are triploblastic coelomate organization, bilateral symmetry, a complete digestive tract, and a ventral nerve cord.

The advantage of tagmatizations lies in the fact that Each tagmata (made up of functionally similar metameres/ segments) performs a specialized function that is independent of other tagmata.

Tagmosis — is The evolutionary process of and modifying segments in metameric organisms such as arthropods to form tagmata. In insects, the body segments (somites or metameres) have become fused into three main tagmata: the head, thorax and abdomen.… … Wikipedia.

Metamerism is The phenomenon of forming a linear series of body segments that are similar in structure. A metameric segment is also called as somite.

Segmentation is the body organization that appears in some organisms and refers to the division of body of animals into repetitive segments or parts. Metamerism:- It is a type of segmentation in which the body is divided into linear series of repeating parts.

Pseudometamerism or strobilization is seen in Tapeworms where segmentation of the body takes place by the segmentation of the ectoderm. The body consists of a number of segments or proglottids which varies in different individuals of the same species. Pseudometamerism occurs in Cestoda tapeworms.

Metamerism produces specialization in regions of the body for specific functions. The regional specialization is called tagmatizafion. In arthropods,, body regions are called tagmata, tagmata are specialized for feeding and sensors perception, locomotion and visceral functions.

Metamerism is A body type exhibited by members of the phylum Annelida. It means that the body is composed of repeating segments attached to make a whole. These segments are known as metameres, and the lines we see externally separating each segment are called annuli. Metamerism is easily visible in earthworms.

Homonomous Metamerism:

It is seen in annelids (Fig. 17.2). Each metamere contains segmental blood -vessels, nerves, nephridia and coelomoducts. This is a primitive type of segmentation and is not found in any existing animal because a few anterior segments are specialised to form the head which is called cephalization.

Phylum Arthropoda. This is largest phylum in any kingdom : over 1 million species. They have a segmented body with very specialized segments : tagmatization.

Also, arthropod bodies are made of several groups of fused segments; the fused segments are called tagmata (singular: tagma), and they act like individual super-segments. Each group of arthropods has a characteristic set of tagmata; for example, Insects have three main tagmata, while spiders have only two. Cuticle.

Anamorphosis or Anamorphogenesis refers to Postembryonic development and moulting in Arthropoda that results in the addition of abdominal body segments, even after sexual maturity.

Metamerism is A phenomenon that occurs when two colors appear to match under one lighting condition, but not when the light changes. Metameric matches are quite common, especially in near neutral colors like grays, whites, and dark colors like these.

Ethers having same molecular formula but different alkyl groups on either side of the oxygen atoms show metamerism. Ethoxy ethane and methoxypropane, phenetole and benzyl methyl ether Show metamerism.

Metamerism happens when the two objects with the same color appear identical under one light source but different under another light source. This phenomenon is mainly caused by the Variations in pigments, dyestuff or materials.

Yes, annelids have segmentation in the form of homonomous metamerism (identical body segments). Annelids are segmented both externally and internally.

Humans and other chordates are conspicuous examples of organisms that have metameres intimately grouped into tagmata. In the Chordata the metameres of each tagma are fused to such an extent that few repetitive features are directly visible.

Solution : Chordates also exhibit metameric segmentation. This is because of repetition of homologous structures along the length of an animal.

Sclerotization is A biochemical process that produces the rigid shell of sclerotin that comprises an insect’s chitinous exoskeleton. It is prominent in the thicker, armoured parts of insects and arachnids, especially in the biting mouthparts and sclerites of scorpions and beetles.

In biology, metamerism is The phenomenon of having a linear series of body segments fundamentally similar in structure, though not all such structures are entirely alike in any single life form because some of them perform special functions. In animals, metameric segments are referred to as somites or metameres.