why are the feeding structures of these worms so different?


Why Are The Feeding Structures Of These Worms So Different??

Why are the feeding structures of these worms so different? Diversification in feeding reduces competition. *Natural selection favors a divergence of feeding types.

How does platyhelminthes differ from annelids?

Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian. Roundworms (phylum Nematoda) have a slightly more complex body plan. Segmented worms (phylum Annelida) are the most complex animals with worm-like body plans. … Worms are invertebrate animals with bilateral symmetry.

Why is it advantageous for organisms to have their feeding structures close to most of the sensory organs?

Sensory and feeding structures are often concentrated around the center point. From an evolutionary perspective, this would be advantageous because these organisms will be encountering stumuli and food from many directions.

Why is ecdysozoa so diverse?

The superphylum Ecdysozoa contains an incredibly large number of species. This is because it includes two of the most diverse animal groups: Phylum Nematoda (the roundworms) and Phylum Arthropoda (the arthropods). … All members of this superphylum periodically molt or shed their cuticle as they grow.

What is an Ecdysozoan and what are some of the unique characteristics of this group of organisms?

Ecdysozoans are a morphologically heterogeneous group of animals which have a cuticle and grow by molting and include the arthropods and nematodes.

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What’s the difference between Platyhelminthes and nematodes?

Nematodes are called roundworms while Platyhelminthes are called flatworms. Nematodes are pseudocoelomates, while Platyhelminthes are acoelomates. Species of nematodes are higher than that of Platyhelminthes. Platyhelminthes have an incomplete gut whereas nematodes have a complete one.

How would you differentiate a free living worms from a parasitic worms?

Free-living species inhabit marine and freshwater environments, as well as the soils and sediments of all of the various types of land biomes. Parasitic roundworms live off of their host and can cause disease in the various types of plants and animals they infect.

Why is it advantageous for an animal to have a distinct head?

First, it allows for the development of a brain. The brain acts as a control center to organize and control sensory information. Over time, animals can evolve complex neural systems and develop higher intelligence. The second advantage of cephalization is that sense organs can cluster at the front of the body.

Why is it an advantage for an animal to have its head be the first part of its body to enter a new area?

Well, animals with heads move in the direction of their anterior end. … So, having the sense organs also at this end allows animals to experience and respond to their environment more efficiently. Think of it this way – it makes more sense to have your eyes viewing what’s in front of you rather than what’s behind you.

What is cephalization and why is it important?

Cephalization is the formation of a central nervous system in organisms. … Cephalization is important in that it allows for the organism to make quick movements. It also allows for the organism to have an axis of symmetry, further making quick movements possible as the organism can either find prey or avoid being prey.

What is the main difference between the Lophotrochozoa and the ecdysozoa?

What is the difference between Lophotrochozoa and Ecdysozoa? Ecdysozoans have the ability to shed their exoskeleton several times throughout their life span, whereas lophotrochozoan are the animals who possess a trochophore larvae and a feeding structure called lophophore.

How does the cuticle differ between crustaceans and all other arthropods?

How does the cuticle differ between crustaceans and all other arthropods? The cuticle of all arthropods is composed of chitin. However, the cuticle in crustaceans is calcified to form a carapace.

What defines ecdysozoa?

Ecdysozoa (/ˌɛkdɪsoʊˈzoʊə/) is a group of protostome animals, including Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and several smaller phyla. … The group is also supported by morphological characters, and includes all animals that grow by ecdysis, moulting their exoskeleton.

How do the Tagmata differ among different arthropod groups?

How do the tagmata differ among different arthropod groups? Tagmata are the segmented, functional body parts of arthropods. … Chilopods (centipedes) have one pair of legs per trunk segment, whereas diplopods have two legs per trunk segment.

What is the advantage of ecdysis molting in arthropods such as crustaceans?

What is the advantage of ecdysis (molting) in arthropods such as crustaceans? Molting is initiated hormonally when inhibiting hormones are decreased and molting hormones are increased. During the pre-molt phase, the old cuticle thins and separates from the epidermis.

Are nematodes bilaterally symmetrical?

Nematodes are bilaterally symmetrical, elongate, and usually tapered at both ends. Some species possess a pseudocoel, a fluid-filled body cavity between the digestive tract and the body wall. Like arthropods and members of six other phyla, nematodes secrete an external cuticle that is periodically molted.

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Why are Platyhelminthes and nematodes in different phyla?

Platyhelminthes and Nematoda are two invertebrate animal phyla. Platyhelminthes consists of flatworms whereas Nematoda consists of roundworms. The main difference between Platyhelminthes and Nematoda is the anatomical structure of the body of each invertebrate.

In what ways are flatworms roundworms and segmented worms different?

Flatworms, which have ribbon-like bodies with no body cavity. Roundworms, which have a body cavity but no segments. Segmented worms, which have both a body cavity and segmented bodies.

What are the main differences between the Cnidaria and the Platyhelminthes phyla?

Cnidarians are diploblastic, whereas Platyhelminthes are triploblastic. Platyhelminthes possess bilaterally symmetrical, soft, worm-like elongated bodies, whereas cnidarian possess radially symmetrical, soft, medusa-like or polyp-like body forms. Cephalization is present in Platyhelminthes, but not in cnidarians.

What do free living nematodes feed on?

Free-living nematodes feed on bacteria, algae, fungi, dead organisms, and living tissues. They release nutrients for plant use and improve soil structure and water holding capacity. They are usually the most abundant type of nematodes in soil and marine environments.

What worms are free living?

Turbellarians (Planarians; Free-Living Flatworms)
  • Dugesia, Planaria, and other genera.
  • Various families in class Turbellaria (free-living flatworms) in the phylum Platyhelminthes (flatworms)
  • Turbellarians, or planarians, have primitive body plans.

Why are parasitic worms studied in microbiology?

Key Concepts and Summary. Helminth parasites are included within the study of microbiology because they are often identified by looking for microscopic eggs and larvae. The two major groups of helminth parasites are the roundworms (Nematoda) and the flatworms (Platyhelminthes).

Why are animals symmetrical?

Having bilaterally symmetrical bodies (the same on both sides along an axis) permit them to propel forward in a straight line. In evolutionary history, animals that moved quickly and efficiently from point A to point B would have been more successful and selected for than those who were ineffective at locomoting.

How does an animal with bilateral symmetry differ from an animal with radial symmetry?

Explanation: The bilateral symmetry animals body are divided into two equal halves from a particular radius passing through the centre. The direction of cutting is fixed. … The radial symmetry animals body are cut into two equal halves from all the radii of the animals body passing through the centre.

What are some of the advantages that bilaterally symmetrical animals have over radially symmetrical ones?

The advantages of bilateral symmetry include the formation of a head and tail region, where the head region can house a detailed nervous system, and more directional movement to include the ability to move straight forward.

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What makes animals different from each other?

Like all living things, animals grow, change, reproduce, and respond to their environment. They get the energy they need from eating food. animal’s body match up with other parts around a midpoint or line. Some kinds of animals have no symmetry.

Why do animals have different body parts?

Different species of animals have different body parts, these are due to the main reason of EVOLUTION. They are used in their own way, for example, In earlier fishes are evolved into reptiles, amphibians, mammals.

Why do all animals have heads?

Heads develop in animals by an evolutionary trend known as cephalization. … Through biological evolution, sense organs and feeding structures also concentrate into the anterior region; these collectively form the head.

What is Cephalisation how it useful to its possessors?

It is useful to its possessors as it helps in the quick voluntary movements to either find prey, or avoid being a prey. It also allows for the organism to have an axis of symmetry, further making quick movements possible as the organism can either find prey or avoid being prey.

What does it mean to call something cephalized?

The definition of cephalization means the trend in evolution for the nervous system and the sensory organs to be positioned near the human or animal head. An example of cephalization is the tendency for an animal’s ears to be on its head. noun.

Are roundworms cephalized?

Compare and contrast the body plans of flatworms with roundworms. Similarities: Both have three germ layers and bilateral symmetry. They both have anterior and posterior ends allowing cephalization to occur. … The roundworm has a body cavity called a coelom.

Which of the following are distinguishing characteristics of the Lophotrochozoa clade?

The clade Lophotrochozoa is named after the two distinct characteristics of its members; the feeding structure lophophore, which is a ciliated crown of tentacles surrounding a mouth, and the developmental stage trochophore larvae.

What morphological Synapomorphy defines Lophotrochozoa?

Synapomorphies = a trait that is shared by two or more taxa and their most recent common ancestor, whose own ancestor in turn does not possess the trait. Lophotrochozoans share a distinctive, horseshoe-shaped feeding structure called a lophophore, and/or a distinctive larval form known as a trochophore.

Which of the following phyla is included in the Lophotrochozoa?

Identify the common characteristics of superphylum Lophotrochozoa. There are five phyla in the superphylum Lophotrochozoa (also known as the crest or wheel animals): Platyhelminthes, Rotifera, Nemertea, Mollusca, and Annelida. These phyla include animals from flatworms to squids.

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