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Phylum Annelida
Annelids are members of the Superphylum Lophotrochozoa. The division of the Phylum is in three classes Hirudineans (leeches), Oligochaetes (earthworms) and Hirudinean (Polychaetes and leeches). They inhibit marine aquatic with Parapodia, like nereis Meglitsch P, 1972()
They are worm like animals that have muscular body walls that elongate. They are also circular in cross section. The major difference between Phylum Annelida and other worm like creatures is that, they have segmented bodies (also known as metameric). Each segment has its own particular function. Phylum Annelida include different types of earthworms, leeches and marine polychaetes. There are those that live in fresh water, marine also terrestrial. Some of them live as parasites. Annelids are skilled in swimming, creeping and burrowing Badea, Gagyi-Palffy, Stoian, & Stan, 2010
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Meglitsch P (1972)
, said that Annelids are connected to Molluscs and seem to have arisen from flatworms. Given the characteristics that the Annelida display,...
Meglitsch's arguments are made from the fact that they both have segmentation. Among Phylum Annelida, those consider most primitives and polychaetes though to-date they have been relegated degenerate Badea et al., 2010
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Characteristics of Phylum Annelida
Characteristics that Phylum Annelida possesses which are distinctive from the other worm like creatures are given in this section. Phylum Annelida have no backbones they have cylindrical segmented bodies (metameric). Their digestion is extracellular, meaning they have a complete mouth to anus digestive system with muscular walls such that body movement does not interfere with digestive tract movements Badea et al., 2010
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. They are vascular - meaning they have a well developed circulatory system - with vessels for pumping and distributing substances throughout the body. They are superb in burrowing, swimming and creeping and their blood contains the respiratory pigment hemoglobin just…
References
Badea, A.B., Gagyi-Palffy, A., Stoian, L.C., & Stan, G. (2010). Preliminary studies of quality assessment of aquatic environments from Cluj suburban areas, based on some invertebrates bioindicators and chemical indicators. [Article]. Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society (AACL Bioflux), 3(1), 35-41.
Meglitsch P. (1972). Invertebrate Zoology. Oxford University Press.
Earthworms are hermaphrodites since they can generate both sperm and eggs. Mating involves 2 earthworms inseminating each other where sperms are exchanged. The male and female sexual cavities are located near the clitellum. They connect the lower ends of their anteriors with heads positioned in reverse directions. Mucous secreted joins the openings with slime. Sperm is pushed into the longitudinal channels formed by the mucous. They reach the sperm receptacles
Phyla and Parasites Ten Phyla: Phylum Mollusca ~ Living Species Number: World: at least 50,000; United States: Approximately 20,000; Texas: More than 2,000; Number of Fossil Forms: 150,000 Phylum Brachiopoda ~ Living Species Number: World: 400; United States: 80; Texas: 10; Number of Fossil Forms: 5,000 Phylum Echinodermata ~ Living Species Number: World: 7,000; United States: Approximately 2,000; Texas: Approximately 200; Number of Fossil Forms: 13,000 Phylum Chordata ~ Living Species Number: World: More than 60,000; United States:
Structure of Animals Two animal phyla that can be compared and contrasted are Nematoda and Annelida. Nematoda are roundworms. There are more than 15,000 known species, with scientists estimating there may be as many as half a million species yet to be discovered (Waggoner, 2009). Nematoda have a worm-like appearance outside and a simple internal body structure. The phylum Annelida includes earthworms and their relatives, leeches, and a large number of
Kingdom: Animalia Phylum: Nematoda Part 2: Answer the following questions as they relate to the nine phyla in the assignment table. (Porifera, Cnidaria, Nematoda, Arthropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.) 1. Which phyla lack organs? What type of symmetry do they have? Porifera and Cnidaria lack organs. Porifera lack any symmetry hence these are asymmetrical while Cnidaria have radial Symmetry. 2. List all of the phyla that show cephalization. The phyla that show cephalization are
Living organisms are subdivided into 5 major kingdoms, including the Monera, the Protista (Protoctista), the Fungi, the Plantae, and the Animalia. Each kingdom is further subdivided into separate phyla or divisions. Generally "animals" are subdivided into phyla, while "plants" are subdivided into divisions. Kingdom of Protista Brown Alga Scientific Classification Kingdom Protista Division Heterokontophyta Phaeophyceae Orders Dictyotales Desmerestiales Fucales Laminariales (kelps) etc. The Brown algae are a large group of multi-cellular algae, including various sorts of seaweed. Their distinctive greenish-brown color comes from the
Like most other animals, the artic fox's cot changes to reflect the summer arctic habitat, becoming a brown or gray color that matches the summer environment (National Geographic, 2008). The photograph by Norbert Rosing (National Geographic, 2004), demonstrates the usefulness of the animal's camouflage: (Norbert Rosing, National Geographic, October, 2004, online at http://ngm.nationalgeographic.com/ngm/finaledit/0410/,2008). The artic fox contributes to the balance of nature because its diet includes rodents, which have a