Terms : Hide Images
| 1744601627 | Invertebrates | Animals without backbone | 0 | |
| 1744602521 | Sponges | Sessile animals that lack true tissues. | 1 | |
| 1744603125 | Suspension feeders | Trap particles that pass through the internal channels of their body (e.g sponges) | 2 | |
| 1744604793 | Cnidaria | Includes corals, jellies and hydras. Have dipoblastic, radially symmetrical body plan that includes gastrovascular cavity with a single opening (serves as anus and mouth) | 3 | |
| 1744605367 | Acoel flatworms | Have simple nervous system and a saclike gut. | 4 | |
| 1744606166 | Acoela | A separate lineage that diverged before the three main bilaterian clades | 5 | |
| 1744607763 | Trichoplax adhaerens | Only species in phylum Placozoa. Can reproduce by dividing into two individuals or by budding off many multicellular individuals. | 6 | |
| 1744610150 | Ctenophores | Diploblastic and radially symmetrical like cnidarians, suggesting that both phyla diverged from other animals very early. | 7 | |
| 1744612471 | Lophotrochozoans | Platyhelminthes, Rotifera, Ectoprocta, Brachiopoda, Acanthocephala, Cycliophora, Nemertea, Annelida, Mollusca | 8 | |
| 1744615648 | Flatworms | Have bilateral symmetry and a central nervous system that processes information from sensory structures. Have no body cavity or organs for circulation | 9 | |
| 1744616241 | Ectoprocts | Live a sessile colonies and are covered by a tough exoskeleton | 10 | |
| 1744616960 | Rotifers | Have specialized organ systems, including an alimentary canal. | 11 | |
| 1744617367 | Alimentary canal | A digestive tract with a mouth and an anus. | 12 | |
| 1744618648 | Brachiopods | Have a unique stalk that anchors them to their substrate, as well as a crown of cilia called a lophophore. | 13 | |
| 1744620595 | Acanthocephalans | Called spiny-headed worms because of the curved hooks on the proboscis at the anterior end of their body. | 14 | |
| 1744621586 | Nemerteans | Swim through water or burrow in sand, extending a unique proboscis to capture prey. | 15 | |
| 1744622652 | Annelids | Distinguished from other worms by their body segmentation. | 16 | |
| 1744623655 | Molluscs | Have a soft body that in many species is protected by a hard shell. | 17 | |
| 1744627807 | Ecdysozoa | Loricifera, Priapula, Onychopora, Nematoda, Tardigrada, Arthropoda. | 18 | |
| 1744629021 | Loriciferans | Tiny animals that inhabit the deep-sea bottom. | 19 | |
| 1744630302 | Priapulans | Are worms with a large, rounded proboscis at the anterior end. | 20 | |
| 1744631403 | Onychophorans | Also called velvet worms, originated during the Cambrian explosion. | 21 | |
| 1744633075 | Nematodes | Have a tough cuticle that coats the body. Enormously abundant and diverse in the soil and in aquatic habitats. | 22 | |
| 1744635655 | Tardigrades | Sometimes called water bears for their rounded shape, stubby appendages, and lumbering bearlike gait. | 23 | |
| 1744636703 | Arthropods | Have a segmented exoskeleton and jointed appendages. | 24 | |
| 1744637599 | Deuterostomia | Hemichordata, Chordata, Echinodermata | 25 | |
| 1744639331 | Hemichordates | Have gill slits and a dorsal nerve cord. | 26 | |
| 1744643538 | Echinoderms | Are marine animals in the deuterostome clade that are bilaterally symmetrical as larvae but not as adults. They move and feed by using a network of internal canals to pump water to different parts of their body. | 27 | |
| 1744643539 | Suspension feeders | Capture food particles suspended in the water that passes through their body. | 28 | |
| 1744644511 | Spongocoel | Pores of a central cavity. | 29 | |
| 1744644819 | Osculum | Larger opening that the spongocoel. | 30 | |
| 1744646889 | Choanocytes | Finger-like projections that form a "collar" around the flagellum. | 31 | |
| 1744648466 | Mesohyl | Gelatinous region that separates the two layers of cells of a sponge. | 32 | |
| 1744650328 | Amoebocytes | Named for their use of pseudopodia. These cells move through the mesohyl have many functions. | 33 | |
| 1744663888 | Nematocysts | Contain a stinging thread that can penetrate the body wall of the cnidarian's prey. | 34 | |
| 1744666717 | Hermaphrodites | Functions as both male and female in sexual reproduction by producing sperm and eggs. | 35 | |
| 1744666718 | Gastrovascular cavity | A sac with a central digestive compartment | 36 | |
| 1744666719 | Polyps | Cylindrical forms that adhere to the substrate by the aboral end of their body and extend their tentacles to wait for prey. | 37 | |
| 1744666720 | Medusa | Moves freely in the water by a combination of passive drifting and contractions of its bell-shaped body. | 38 | |
| 1744666721 | Cnidocytes | Cells unique to cnidarians that function in defense and prey capture. | 39 | |
| 1744666722 | Cnidae | Capsule-like organelles that are capable of exploding outward. | 40 | |
| 1744666723 | Hydra | Reproduces asexually by budding, forming outgrowths that pinch off from the parent and live independently. | 41 | |
| 1744668917 | Scyphozoans | Their predominant stage in their life cycle is the medusa. | 42 | |
| 1744670500 | Cubozoans | Have a box-staged medusa stage. | 43 | |
| 1744670921 | Anthozoans | Occur only as polyps. | 44 | |
| 1744672560 | Lophophore | A crown of ciliated tentacles that functions in feeding. | 45 | |
| 1744673893 | Flatworms | Have thin bodies that are flattened dorsoventrally. Acoelomates | 46 | |
| 1744981102 | Protonephridia | Networks of tubules with ciliated structures called flame bulbs that pull fluid through branched ducts opening to the outside. | 47 | |
| 1744981103 | Planarians | Prey on smaller animals or feed on dead animals. Can reproduce asexually through fission. | 48 | |
| 1744981104 | Trematodes | Parasitize a wide range of hosts, and most species have complex life cycles with alternating sexual and asexual stages. | 49 | |
| 1744981105 | Tapeworms | Lack a mouth and gastrovascular cavity; they simply absorb nutrients released by digestion in the host's intestine. | 50 | |
| 1744981106 | Rotifers | Tiny animals that inhabit freshwater, marine, and damp soil habitats. | 51 | |
| 1744981107 | Alimentary canal | A digestive tube with two openings, a mouth and an anus. | 52 | |
| 1744981108 | Parthenogenesis | Consist only of females that produce more females from unfertilized eggs. | 53 | |
| 1744981109 | Ectoprocts | Colonial animals that superficially resemble clumps of moss. | 54 | |
| 1744981110 | Exoskeleton | External skeleton studded with pores through which the lophophores extend. | 55 | |
| 1744981111 | Brachiopods | Superficially resemble clams and other hinge-shelled molluscs. | 56 | |
| 1744981112 | Molluscs | Soft-bodied and secrete a hard protective shell made of calcium carbonate. | 57 | |
| 1744981113 | Muscular foot | Usually used for movement. | 58 | |
| 1744981114 | Visceral mass | Containing most of the internal organs. | 59 | |
| 1744981115 | Mantle | Fold of tissue that drapes over the visceral mass and secretes a shell. | 60 | |
| 1744981116 | Mantle cavity | Houses the gills, anus and excretory pores. | 61 | |
| 1744981117 | Radula | A straplike organ used to scrape food. | 62 | |
| 1744981118 | Chitons | Have an oval-shaped body and a shell composed of eight dorsal plates. | 63 | |
| 1744981119 | Gastropods | Most are marine but there are also freshwater species. | 64 | |
| 1744981120 | Torsion | A distinctive developmental process in which the visceral mass rotates up to 180 degrees, causing the animal's anus and mantle cavity to wind up above its head. | 65 | |
| 1744981121 | Bivalves | Have a shell divided into two halves. Have no distinct head, and the radula has been lost. Some have eyes and sensory tentacles along the outer edge of their mantle. | 66 | |
| 1744981122 | Cephalopods | They use their tentacles to grasp prey, which then they bite with beak-like jaws and immobilize with a poison present in their saliva. They are molluscs with closed circulatory system. | 67 | |
| 1744981123 | Closed circulatory system | The blood remains separate from fluid in the body cavity. | 68 | |
| 1744981124 | Parapodia | A pair of paddle-like or ridge-like structures that function in locomotion. | 69 | |
| 1744981125 | Oligochaetes | Named for their relatively sparse chaetae. | 70 | |
| 1744981126 | Earthworms | Eat their way through the soil, extracting nutrients as the soil passes through the alimentary canal. | 71 | |
| 1744981127 | Leeches | Predators that feed on other invertebrates, but some are parasites that suck blood by attaching temporarily to other animals including humans. | 72 | |
| 1744981128 | Cuticle | Tough external coat. | 73 | |
| 1744981129 | Nematodes | Found in most aquatic habitats, in the soil, and in the moist tissue of plants. | 74 | |
| 1744981130 | Arthropods | Have segmented bodies, hard exoskeleton, and jointed appendages. | 75 | |
| 1744981131 | Open circulatory system | Fluid called hemolymph is propelled by a heart through short arteries and then into spaces called sinuses surrounding the tissues and organs. | 76 | |
| 1744981132 | Chelicerates | Have an anterior cephalothorax and a posterior abdomen. They lack antennae and most have simple eyes. | 77 | |
| 1744981133 | Eurypgerids | Known as water scorpions. | 78 | |
| 1744981134 | Arachnids | Includes scorpions, spiders, ticks, and mites. | 79 | |
| 1744981135 | Book lungs | Stacked platelike structures contained in an internal chamber. | 80 | |
| 1744981136 | Myriapods | Millipedes and centipedes belong to this phylum. | 81 | |
| 1744981137 | Insects | They live in almost every terrestrial habitat and in fresh water, and flying insects fill the air. | 82 | |
| 1744981138 | Isopods | Include terrestrial, freshwater and marine species. | 83 | |
| 1744981139 | Decapods | Lobsters, crayfishes, crabs and shrimps are all relatively large crustaceans called.. | 84 | |
| 1744981140 | Copepods | Grazers that feed upon algae, while others are predators that eat small animals. | 85 | |
| 1744981141 | Water vascular system | A network a of hydraulic canals branching into extensions called tube feet | 86 | |
| 1744981142 | Tube feet | Function in locomotion and feeding. | 87 | |
| 1744981143 | Asteroidea | Sea star and sea daisy | 88 | |
| 1744981144 | Ophiuroidea | Brittle star. | 89 | |
| 1744981145 | Echinoidea | Sea urchin and sand dollar | 90 | |
| 1744981146 | Crinoidea | Sea lily and feather star | 91 | |
| 1744981147 | Holothuroidea | Sea cucumber. | 92 |
