Phylum Coelenterata includes nearly 11,000 known species half of which are extinct. These are very successful animals due to a protective exoskeleton and jointed appendage. According to Hyman phylum, Coelenterata has been classified into 3 classes. Phylum Chordata. The Animal Kingdom. The phylum Arthropoda is the largest animal phylum. The key difference between mollusks and arthropods is that mollusks are soft-bodied invertebrates with one or two shells while arthropods are animals with segmented bodies, paired appendages and an exoskeleton.. Phylum Mollusca and Phylum Arthropoda are two major vertebrate phyla that include the highest number of species diversity than any phyla in the Animal Kingdom. Besides these, many arthropods are not yet unidentified. For example, animals belonging to Class Insecta have three distinct segments: the head, the thorax (often grouped together with the head as the cephalothorax), and the abdomen.The rhinoceros beetle (Fig. these are known as an evolutionary group (or phylum ) of invertebrates (the most diverse phylum of the animal kingdom) having a complex organization.. it is said that two of every three known species of animals are arthropods. The word “arthropod” means jointed foot and refers to their characteristic jointed appendages. It is estimated that about 84% of all known species of animals belong to this phylum and number of known species vary between 1,170,000 and 5 to 10 million. The number of species is estimated to be between 5,000 and 10,000. 1. Phylum Porifera (Sponges). The most distinguishing feature of a Chordata is that it has a bundle of nerves and cartilage supporting these nerves all along the back, also known as the spine. All animals belong to a biological kingdom called kingdom Animalia.This kingdom is then broken down into over 30 groups, or phyla (plural form of phylum).About 75% of all species on Earth are animals. they belong to the phylum Arthropoda and nearly found in every habitat of the biosphere. ; Thorax (middle bit) has three pairs of legs. Chordates are coelomate and show an organ system level of organisation. Major External Characteristics . This represents approximately three-quarters of all known biological organisms, living or extinct. Arthropoda' literally means animals bearing jointed feet (Gr. 3. 4) has a head and thorax that are fused (a cephalothorax) and a large abdomen. These glands have ducts. These animals are characterized by a segmented body as well as the presence of jointed appendages. Phylum Arthropoda includes animals that have been successful in colonizing terrestrial, aquatic, and aerial habitats. These animals have versatile habitat and are found in air, water and on land. PHYLUM ARTHROPODA . Arthropods, which make up the phylum Arthropoda, is the largest group of invertebrates (animals without a vertebral column) consisting of well over 80 percent of all animals.. For example, animals belonging to Class Insecta have three distinct segments: the head, the thorax (often grouped together with the head as the cephalothorax), and the abdomen.The rhinoceros beetle in the adjacent image has a head and thorax that are fused (a cephalothorax) and a large abdomen. Learn more about cnidarians in this article. These unicellular crea­tures have therefore been placed in the subkingdom protozoa, which includes only one phylum, the protozoa. Phylum Arthropoda 9. Phylum Echinodermata 11. Some animals are pelagic . These jointed appendages variously specialized for feeding, locomotion, sensing . Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students.ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. 2. ... All Chordates have these openings on the lateral sides of the pharynx at some stage of their life. Phylum Chordata is the most familiar phylum in the animal kingdom as it includes all animals that possess, ... Let us have a detailed look at the characteristics and classification of phylum Chordata. Characteristic Features of Phylum Chordata. The classification followed here is given by Hyman, L. H., (1940). Exoskeleton containing chitin . Distinct Head. Kingdom Animalia: Phylum Arthropoda. Arthropods are segmented, and generally there are distinct boundaries between the segments. Arthropoda is treated here as a monophyletic clade of genetically diverse but evolutionarily linked species. Kingdom - Animalia Phylum - Arthropoda Class - Insecta. All are marine, generally live in sea bottom and are slowly moving animals. Generally, arthropods are characterized by a segmented body (consisting of a head, thorax, and abdomen) as well as jointed appendages. Sponges, or phylum Porifera, are one of the most common types of invertebrate animals.Currently, there are about 3,000 documented sponge species. Arthropoda: Arthropods are commonly called animals with jointed legs. 1. Platyhelminthes are flatworms. 5. Phylum Arthropoda is the largest animal group which constitutes the largest percentage of the world’s organisms. Nematode species can be difficult to distinguish, and although over 25,000 have been described, of which more than half are parasitic, it is estimated that over 40,000 species exist. In the basic body plan, a pair of appendages is present per body segment. James H. Thorp, in Encyclopedia of Insects (Second Edition), 2009. They are bilaterally symmetrical and triploblastic. The nematodes or roundworms constitute the phylum Nematoda (also called Nemathelminthes). Comparison of the Major Animal Phyla Common NameCommon Name (Phylum) Snails, Clams, SquidSnails, Clams, SquidSnails, Clams, Squid (Mollusca) Insects, Arachnids, CrustaceansInsects, Arachnids, Crustaceans (Arthropoda) Sea Stars, Sea Urchins Sea Stars, Sea Urchins (Echinodermata) VertebratesVertebrates (Chordata) Level of The phylum name comes from the Latin words porus, which means "pore," and ferre which means "to bear." Phylum Mollusca 10. The phylum includes such animals as spiders, insects, shrimps and craps among many others that can be found in a wide range of environments from the ocean floor to the mountain peaks. This phylum is commonly called sponges. Their bodies are covered with the hard shell made up of chitin, forming and exoskeleton. Animals are then broken down into two types: vertebrates and invertebrates. All are aquatic and almost all are marine. Arthropoda: Arthropoda refers to an animal phylum that consists of haemocoelomates with a segmented body, joint appendages, and chitinous exoskeleton. Members of the Phylum Arthropoda are known as arthropods. Phylum Aschelminthes; Phylum Arthropoda; Download Animal Kingdom Cheat Sheet Below. That is why more than 8.5 lakh arthropod species are known as against about 2.5 lakh species of the remaining animals. The cells possess no cell walls and plastids. Cnidaria are also simple, aquatic animals. Example Phylum: Arthopoda. Animals in this phyla have no true tissues, which means, for example, that they have no nervous system or sense organs. These include sea anemones, jellyfish, corals and hydroids. Most of them are free moving (except sponges and some coelentrates) Nutrition is primarily ingestive. Arthon- jointed ; podos- legs ) Arthropoda, which also consists of crustaceans, Insects, crabs,,... 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