Annelid

(class) Chromadorea (class) Kingdom: Animalia Phylum: Annelida Classification information for Annelids: Annelids, known for their features of segmentation, also called metamerism, tend to be inhabitants of the sea, most freshwater habitats, and terrestrial environments (Myers, 2001d). Annelids, besides leeches, not only have chitinous hairlike structures called setae projecting from their cuticles that define them, but also, a full, well-developed true coelom (Myers, 2001d). This allows hydrostatic pressure be maintained against their segments which not only maintains their overall body righty, but also allows muscle contractions to bend the body without collapsing it (Myers, 2001d). As mentioned in the former, their well-developed coelom is complete; thus, allowing their organs to be fully compacted with not only an arranged circulatory system, in addition to a digestive system, but a full nervous system as well (Myers, 2001d). The major groups of annelids include: earthworms, leeches, and polychaete worms (Myers, 2001d). Polychaeta (class) Clitellata (class)…

embryonic stage made of a hollow ball of cells, the blastula. There are over 1.5 million living animal species, of which around 1 million are insects. The study of animals is called zoology. Animals were traditionally divided by body plan into vertebrates, those with a spine, and invertebrates, all the rest. In modern classification, most animals are in the Bilateria, a clade whose members are characterized by a bilaterally symmetric body plan. The Bilateria include the protostomes and the…

Mealworms, Tenebrio molitor Introduction: Mealworms are the worm-like larval form of a very dark brown beetle, Tenebrio molitor, a species which belongs to the genus Tenebrio and the family Tenebrionidae. The animal has other common names such as “Yellow mealworm”, “Mealworm beetle”, “Darkling beetle”, and “Darkening beetle”. The larval form is the usable form in pet’s keepers. Distribution and habitats: Mealworms are found throughout most of the world in temperate regions, but primarily in the…

Reflections on Teaching & Learning: Your Lesson Evaluation should include EACH of the following: Decisions about the plan • Why did you choose to use these specific teaching strategies? I felt that an inquiry-based strategy would be beneficial to the students, because I wanted to allow them to make their own hypothesis and then conduct experiments making their own observations before providing them with information and details. This allowed them to make personal connections with what they…

3. The earthworm has a segmented body with a mouth at the anterior end and an anus at the posterior end. It has a smooth, purple dorsal side and a rough, yellow ventral side with setae. Two sperm grooves run along the body from segment 15 (where sperm ducts are also located) to the clitellum, which looks like a tube surrounding the earthworm’s body and is closer to the anterior end. 4. The setae are likely on the outside of the body for more effective locomotion. They allow the earthworm to…

contained in the pseudocoelom operate as a hydrostatic skeleton, or an exoskeleton that maintains its form due to the pressure of fluid inside the skeleton. Roundworms have two nerve cords that transmit impulses in the roundworm. Also, they are able to reproduce sexually by internal fertilization. Earthworms and other segmented worms make up the Annelida phylum. Annelids are divided into a number of segments that are divided by septa, or internal walls. Many of the segments are similar to one…

Phylum Nematoda, Unlike Platyhelminthes the muscles of nematodes differ in that they only developed a layer of longitudinal muscle. These animals are pseudocoelomates, which means they have a body cavity between their mesoderm and endoderm layers, it is because of this development that, the movements of the gut (peristalsis) are quite separate from the movements of muscles that propel the body forward. Nematodes have long muscles that lie underneath the epidermis, the muscles are all aligned…

but is easily identifiable by viewing a flatworm. The phylum Platyhelminthe, which are flatworms, have bilateral symmetry. If you were to cut a roundworm in half and looked down on one end, you would find that roundworms have a tube-like gut or a hollow gut. One disease caused by a parasitic roundworm is ascariasis. SOURCE Roundworms have a pseudocoelom. No, not all mollusks have shells. Slugs, squids, and octopi are examples of mollusks that do not have shells. …

the middle prismatic layer, and the outer periostracum. Mollusk reproduce sexually. Most mollusks have a rasping tongue called a radula, armed with tiny teeth. This scrapes tiny plants and animals off rocks or tears food into chunks. Some examples include snails, clams, squids; etc. Chapter 3: Invertebrates (cont.) Segmented worms (Annelids) The annelid body consists of a head region, a trunk made up of metameres, and an unsegmented terminal region called the pygidium. Reproduction is both…

To start off the exhibit is the Precambrian period. The Precambrian period lasted for 4 billion years. Scientists believe that this period where 90%of earth's history was discovered. Life first started evolving, and progresses and changed the planet. Scientists discovered the truth about organic compounds, the first prokaryotic cells and the first meteorites to hit the earth. Scientists believe that some of these meteorites gave rise to organic compounds, or life's building blocks. The Cambrian…