It is believed that if an animal gets a notochord at point of its life, then it will be considered as a chordate. Digestive system is in the form of an alimentary canal which has two openings, mouth and anus. They share many similarities and dissimilarities with chordates. Their digestive system consists of a gut with two openings, the mouth and the anus. Non chordata includes a number of phyla.The major ones are Porifera, Coelenterata, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca and Echinodermata. Ellias placed sponges among animals. They are less developed as compared to the chordates. They possess a segmented body and display bilateral symmetry. This phylum includes over 50,000 living species and is the second largest phylum of invertebrates. Sub-kingdom Non-chordata is further classified into 9 phyla, namely: Porifera They have an organ level of organization. Phylum : Porifera or sponges. Grade of organization: cellular grade of body Shape: Body shape is variable, mostly cylinder shaped Symmetry: Asymmetrical or radially symmetrical. Study of sponges is called Parazoology. They do not have well-developed body systems like the digestive system, reproductive system, etc. Page no: 43-73. c) Fertilization takes place in an eternal manner, where as some species are found to have internal fertilization. Phylum: Porifera (L. poros-pore; ferre-to bear) These pore bearing animals are commonly called sponges. Mollusks are triploblastic coelomates with a bilaterally symmetrical body. Their body is divided into an anterior proboscis, collar and trunk. Arihant’s handbook of biology. Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers). They are aquatic, mostly marine, asymmetrical and a few species live in freshwaters. Chordates are a group of animals that includes the vertebrate, together with several closely related invertebrates. Non-chordates are animals without a notochord – the rod-like elastic structure that supports the body. both male and female reproductive organs are present in the same individual. About 10,000 species of sponges are present today. Basic Terms : Chordates : Non-Chordates : Meaning: These are organisms with backbones: These are organisms without backbones: … They are aquatic, mostly marine, asymmetrical and a few species live in freshwaters. Coelenterates are found in two basic forms: They have alternation of generation in their life cycle. The first phylum under non-chordates is Porifera. There are approximately 5000 species in a phylum Porifera. SECTION - B Objective Type Questions 1. A phylum of aquatic invertebrate animals that comprises the sponges. 12 1 Chordates Biology LibreTexts. Notochord is a rod-like elastic structure which gives rise to the vertebral column. Non Chordates (Invertebrata) 1. These animals are without a backbone. Pro Lite, NEET They are named so due to the presence of jointed appendages. They found in all seas, wherever there are rocks, shells, submerged timbers, or coral to provide a suitable substratum. Sponges, the members of the phylum Porifera (/ p ə ˈ r ɪ f ər ə /; meaning "pore bearer"), are a basal Metazoa (animal) clade as a sister of the Diploblasts. Non chordata, includes a number of phyla: Phylum Porifera, Phylum Coelenerata, Phylum Platyhelminthes, Phylum Aschelminthes, Phylum Annelida, Phylum Arthropoda, Phylum Mollusca and Phylum Echinodermata. Leucosolenia. In sea they occur up to a depth of 8,500 m and mostly flourish in warm waters. The body of these organisms is unsegmented, however they exhibit bilateral symmetry. All organisms from phylum porifera to phylum hemichordata are referred to as non-chordates. They lack a respiratory system; exchange of gasses occurs through the body surface. The zygote … Excretion occurs with the help of specialized structures called nephridia. These cells give rise to another type of cell-nematocysts, which are the stinging structures. Kingdom: Animalia Habitat: Aquatic, mostly marine, few are terrestrial Habit: They are solitary or colonial. They possess an unsegmented body and display bilateral symmetry. Class - Calcarea. One of the important factors, taken into account while classifying the different kinds of animals in the world is the presence of spine or backbone in their body. d) They are generally bilaterally symmetrical, coelomate and triploblastic. Subkingdom PARAZOA. 1.2-Introduction The word “arthron” means joint whereas “pods” means feet. The primitive chordates resemble the non-chordates in some respects and are known as protochordates or invertebrate chordates. The chordate body is supported by fluid in the body cavities. Class CALCAREA (=CALCISPONGIAE). That makes their study the most fascinating one. Circular and longitudinal muscles in the body wall help in the locomotion. Non – Chordates . Repeaters, Vedantu The amphibians are generally not able to generate the temperature of their bodies and their skin types limit the distribution of their residence from moist to warm climates. Some classifications also include the phylum Hemichordata with the chordates. Coelenterates are also known as Cnidarians due to the presence of special cells called cnidocytes. A brief account of corals & coral reefs … They possess a cylindrical and unsegmented body. In sea they occur up to a depth of 8,500 m and mostly flourish in warm waters. Without three embryonic tissue layers to form a foundation for later development, the sponges and cnidarians are … The only phylum bearing pseudocoelom is (1) Annelida (2) Porifera (3) Aschelminthes (4) Platyhelminthes Sol. This phylum consists of a small group of worm-like, marine species with an organ-system level of organization. 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