Which phyla exhibit segmentation

Likewise, what does it mean to have a segmented body? A segmented body is a division of an animal's body plan, whereby the body is divided into functional units. These units form 3 sections, whether individually or together with other segments. Arthropods, meaning animals with jointed appendages such as the dragonfly pictured above, have segmented bodies.

All members of three large animal phyla are metameric: Annelida , Arthropoda , and Chordata. The first two exhibit conspicuous segmentation in the adult. Segmentation in the human nervous system.

Segmentation is the physical characteristic by which the human body is divided into repeating subunits called segments arranged along a longitudinal axis.

In humans , the segmentation characteristic observed in the nervous system is of biological and evolutionary significance. Arthropoda is the phylum that is characterized by segmented body. Are Cnidaria segmented? Taxonomic level: phylum Cnidaria; grade of construction: two tissue layers; symmetry: radial; type of gut: blind gut; type of body cavity other than gut: none; segmentation: none; circulatory system: none; nervous system: network of nerve cells; excretion: diffusion from cell surface.

Do worms have a segmented body? Earthworms are classified in the phylum Annelida or Annelids. Each segment or section has muscles and bristles called setae. Is butterfly segmented or unsegmented? Butterflies and moths, like all insects, have an exoskeleton, a pair of compound eyes, a pair of antennae, six jointed legs, and a body segmented into three parts - the head, the thorax, and the abdomen. Do Kangaroos have segmented bodies?

For example, the following organisms are a set from which a cladogram can be made; kangaroo, earthworm, amoeba, lizard, cat, sponge, and salmon. Each of these creatures has an evolutionary relationship to one another.

What is an animal that has a segmented body? Student Resources. Key Concepts. Marine Biology Explorations. Marine Biology in the News. Web Links. Contact Your Sales Rep. Higher Education Comment Card. Basic Facts. This adaptation possibly helps the leeches to elongate when they ingest copious quantities of blood from host vertebrates.

The subclass Brachiobdella includes species like Branchiobdella balcanica sketi and Branchiobdella astaci , worms that show similarity with leeches as well as oligochaetes. Figure 3. The a earthworm, b leech, and c featherduster are all annelids. Phylum Annelida includes vermiform, segmented animals. Segmentation is seen in internal anatomy as well, which is called metamerism.

Annelids are protostomes. These animals have well-developed neuronal and digestive systems. Some species bear a specialized band of segments known as a clitellum. Annelids show the presence numerous chitinous projections termed chaetae, and polychaetes possess parapodia. Suckers are seen in order Hirudinea. Reproductive strategies include sexual dimorphism, hermaphroditism, and serial hermaphroditism. Internal segmentation is absent in class Hirudinea.

Improve this page Learn More. Skip to main content. Module Invertebrates. Search for:. This is a combination video and animation on annelid anatomy. Try It.