Books on Non-Chordata Please enter your username or email address. 13 Solution of Assignment (Set-2) Animal Kingdom (General Accounts & Non-Chordates) Aakash Educational Services Pvt. Mollusks are triploblastic coelomates with a bilaterally symmetrical body. Non chordata, includes a number of phyla: Phylum Porifera, Phylum Coelenerata, Phylum Platyhelminthes, Phylum Aschelminthes, Phylum Annelida, Phylum Arthropoda, Phylum Mollusca and Phylum Echinodermata. Body cavities are present in coelenterates. Sponges are sessile metazoans, which lack body symmetry. These pores are termed as Ostia, through which water enters the body of sponges. They possess the ability of regeneration. Even the nerve chord which is present, is double, bearing ganglia and ventrally present, their heart is also dorsal in position. They have a close relationship to chordates and that’s why they are called pre-chordates. Specialized polyps in the coelenterates form coral reefs. Phylum PORIFERA. The body structure of the species generally follows the pattern of head, trunk and tail. Answer. d) They are generally bilaterally symmetrical, coelomate and triploblastic. Sponges range from 1 … Non chordata includes a number of phyla.The major ones are Porifera, Coelenterata, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca and Echinodermata. Chordates and NonChordates (Phylum Porifera - Phylum Echinodermata) Kingdom Animalia are divided into two major groups, viz., the non chordates and chordates. However, larvae of Poriferans are able to move (swim). That makes their study the most fascinating one. both male and female reproductive organs are present in the same individual. They found in all seas, wherever there are rocks, shells, submerged timbers, or coral to provide a suitable substratum. b) Usually their body holds a circulatory system, open in form. Animal Diversity (Non-Chordata) THE NON-CHORDATES. The excretory system of platyhelminthes consists of branching tubes having bulb-like cells at the ends called flame cells. The body design involves very minimal differentiation and division into tissues. It includes earthworms, flatworms, sponges, jellyfish, cockroaches, etc. Therefore, non-chordates do not possess a vertebral column and are termed as invertebrates. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.The branch of zoology that … About 10,000 species of sponges are present today. They are primitive, multicellular, sessile animals with cellular level of organisation in which the cells are loosely arranged. These have been discussed in details in the following heads. There are about 5,000 species of sponge, mostly marine and few freshwater species. Nemathelminthes. The main difference between chordates and non-chordates is that chordates are the animals with backbone whereas non-chordates are the animals without a backbone. In addition to this main feature, other features such as nerve cord, post-anal tail, and pharyngeal slits can … Animal phyla are also traditionally defined by the fact that all members of the phylum share a number of distinct morphological features, which are known as the body plan of that phylum. Ltd.-Regd. They are mostly marine animals and may live solitary or in the form of colonies. Poriferans are pore-bearing first … The word “arthron” means joint whereas “pods” means feet. The gastro-vascular cavity in coelenterates acts as digestive as well as the body cavity. MCQ Biology - Learning Biology through MCQs . Locomotion in nematodes occurs through undulating waves of contraction and relaxation. 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