An Introduction to Invertebrates
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| 1430994233 | invertebrates | Animals without backbones | 0 | |
| 1430994234 | choanocytes | specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge | 1 | |
| 1430994235 | suspension feeders | an animal that extracts food particles suspended in the surrounding water | 2 | |
| 1430994236 | spongocoel | large central cavity of the sponge | 3 | |
| 1430994237 | osculum | A large opening on a sponge through which filtered water is expelled | 4 | |
| 1430994238 | amoebocytes | cells that move using pseudopods and perform different functions in different animals | 5 | |
| 1430994239 | mesohyl | a gelatinous region between the two layers of cells of a sponge | 6 | |
| 1430994240 | hermaphrodites | animals that produce sperm and egg in the same body | 7 | |
| 1430994241 | gastrovascular cavity | digestive chamber with a single opening, in which cnidarians, flatworms, and echinoderms digest food | 8 | |
| 1430994242 | Polyps | cnidarians, like sea anemones, that do not move as much at all | 9 | |
| 1430994243 | medusa | any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans | 10 | |
| 1430994244 | cnidocytes | stinging cell on a cnidarian's tentacle | 11 | |
| 1430994245 | nematocysts | small capsules that contain a toxin which is injected into prey or predators | 12 | |
| 1430994246 | Cnidarians | invertebrates that have stinging cells and take food into a central body cavity | 13 | |
| 1430994247 | Lophotrochozoans | refers to animals in the taxa who either develop a lophophore or go through the trochophore larva stage | 14 | |
| 1430994248 | protonephridia | an excretory system, such as the flame bulb system of flatworms, consisting of a network of tubules lacking internal openings | 15 | |
| 1430994249 | planarians | A free-living flatworm found in unpolluted ponds and streams. | 16 | |
| 1430994250 | alimentary canal | digestive tube that extends from the mouth to the anus | 17 | |
| 1430994251 | parthenogenesis | development of an egg without fertilization | 18 | |
| 1430994252 | Brachiopods | lamp shells; resemble clams; dorsal and ventral shells | 19 | |
| 1430994253 | Ectoprocts | colonial animals that ressemble moss, encased by hard exoskeleton studed with pores from where the lophophore extend | 20 | |
| 1430994254 | exoskeleton | the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs | 21 | |
| 1430994255 | muscular foot | part of a mollusks head-foot whose function is locomotion | 22 | |
| 1430994256 | visceral mass | area beneath the mantle of a mollusk that contains the internal organs | 23 | |
| 1430994257 | mantle | a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell | 24 | |
| 1430994258 | mantle cavity | A water-filled chamber that houses the gills, anus, and excretory pores of a mollusk | 25 | |
| 1430994259 | radula | tongue-shaped structure used for feeding by snails and slugs | 26 | |
| 1430994260 | Ectoprocts | colonial animals that ressemble moss, encased by hard exoskeleton studed with pores from where the lophophore extend | 27 | |
| 1430994261 | torsion | In gastropods, a developmental process in which the visceral mass rotates up to 180°, causing the animal's anus and mantle cavity to be positioned above its head. | 28 | |
| 1430994262 | ammonites | Mollusc organisms like snails, clams, brachiopods, octopus, and squid. | 29 | |
| 1430994263 | cuticle | hard outer covering or case of certain organisms such as arthropods and turtles | 30 | |
| 1430994264 | molting | process in which an arthropod sheds its exoskeleton and manufactures a larger one to take its place | 31 | |
| 1430994265 | arthropods | invertebrates that have an external skeleton, a segmented body, and jointed leg attachments called appendages | 32 | |
| 1430994266 | chelicerates | they have two body segments - cephalothorax and abdomen-, four pairs of walking legs, lack an antennae, and respire using book lungs, where spiracles are used for air to enter into. | 33 | |
| 1430994267 | myriapods | A terrestrial arthropod with many body segments and one or two pairs of legs per segment. millipedes and centipedes comprise the two classes of living myriapods. | 34 | |
| 1430994268 | hexapods | insects - 3 body regions (head:antannae, mandibles - thorax: 3 pairs of walking legs - abdomen: no appendages), most abundant and diverse, herbivores, detrivores, fluid drinkers, predators, scavengers, parasites | 35 | |
| 1430994269 | crustaceans | Any of various predominantly aquatic arthropods of the class Crustacea, including lobsters, crabs, shrimps, and barnacles, characteristically having a segmented body, a chitinous exoskeleton, and paired, jointed limbs. | 36 | |
| 1430994270 | chelicerae | pair of mouthparts in chelicerates that contain fangs and are used to stab and paralyze prey | 37 | |
| 1430994271 | eurypterids | an extinct carnivorous cheliceriform also called a water scorpion | 38 | |
| 1430994272 | open circulatory system | A circulatory system that allows the blood to flow out of the blood vessels and into various body cavities so that the cells are in direct contact with the blood | 39 | |
| 1430994273 | arachnids | A member of a major arthropod group that includes spiders, scorpions, ticks, and mites. All members have eight pairs of walking legs. | 40 | |
| 1430994274 | book lungs | Organs of gas exchange in spiders, consisting of stacked plates contained in an internal chamber. | 41 | |
| 1430994275 | mandibles | mouthparts of arthropods | 42 | |
| 1430994276 | complete metamorphosis | Insect development consisting of four stages: egg, larva, pupa, and adult | 43 | |
| 1430994277 | incomplete metamorphosis | Insect development consisting of three stages: egg, nymph, and adult | 44 | |
| 1430994278 | tube feet | branches of water vascular system that function in locomotion, feeding and respiration | 45 | |
| 1430994279 | water vascular system | system of internal tubes in echinoderms that carries out essential functions such as feeding, respiration, circulation, and movement | 46 | |
| 1430994280 | echinoderms | invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system | 47 | |
| 1430994281 | decapods | Group of crustaceans that includes crabs and lobsters. The cuticle is reinforced, forming a dorsal shield called the carapce. | 48 | |
| 1430994282 | isopods | A member of one of the largest groups of crustaceans, which includes terrestrial, freshwater, and marine species. Among the terrestrial isopods are the pill bugs, or wood lice. | 49 | |
| 1430994283 | copepods | minute shrimp-like crustaceans; often they are the most common zooplankton in estuarine waters | 50 |
