Snail norwegian Watson snail crawling over beach

s commonly known as shell include:An animal shell, the hard, rigid outer covering of an animal such as a mollusk or a turtle. The hard outer layer of some plant fruiting bodies such as nuts.A type of user interface in computer software, often an operating system shell, such as a Unix shell command line interpreter in the Unix operating system or the DOS Shell in MS-DOS. See shell (computing).An electron shell (energy level), consisting of a number of electrons in an orbital around an atomic nucleusThe short name (and Brand) of the Royal Dutch Shell energy multinational, and its US subsidiary Shell Oil CompanyA projectile with explosive charge, shot from a gun; typically shells are larger than bullets and shot from larger guns. See shell (projectile).In physics, see On shell and off shellA structural form, usually made of concrete, that principally derives its strength by virtue of its shape. The term is derived from the primary usage in the context of nature. For example, the shell of an egg, though very thin, is difficult to break because of its shape.A long, narrow, rowed watercraft. See racing shell.A sorting algorithm invented by Donald L. Shell. See shell sort. See more at Wikipedia.org...

ass: ApterygotaOrdersArchaeognatha (Bristletails)Thysanura (Silverfish)Monura - extinct Subclass: PterygotaInfraclass: "Paleoptera" (paraphyletic)OrdersEphemeroptera (mayflies)Protodonata - extinctOdonata (dragonflies and damselflies)Diaphanopteroidea - extinctPalaeodictyoptera - extinctMegasecoptera - extinctArchodonata - extinctInfraclass: NeopteraOrdersBlattodea (cockroaches)Isoptera (termites)Mantodea (mantids)Dermaptera (earwigs)Plecoptera (stoneflies)Protorthoptera - extinctOrthoptera (grasshoppers, etc)Phasmatodea (walking sticks)Caloneroptera - extinctTitanoptera - extinctEmbioptera (webspinners)ZorapteraGrylloblattodeaMantophasmatodea (gladiators)Superorder: ExopterygotaOrdersPsocoptera (booklice, barklice)Thysanoptera (thrips)Phthiraptera (lice)Hemiptera (true bugs)Superorder: EndopterygotaOrdersRaphidioptera (snakeflies)Megaloptera (alderflies, etc.)Neuroptera (net-veined insects)Coleoptera (beetles)Strepsiptera (twisted-winged parasites)Mecoptera (scorpionflies, etc.)Siphonaptera (fleas)Diptera (true flies)Trichoptera (caddisflies)Lepidoptera (butterflies, moths)Hymenoptera (ants, bees, etc.)Protodiptera extinctIncertae sedisGlosselytrodea extinctMiomoptera - extinct Insects are invertebrate animals of the Class Insecta, the largest and (on land) most widely distributed taxon within the Phylum Arthropoda. Insects comprise the most diverse group of animals on the earth, with over 800,000 species described—more than all other animal groups combined: "Indeed, in no one of her works has Nature more fully displayed her exhaustless ingenuity," Pliny exclaimed. Insects may be found in nearly all environments on the planet, although only a small number of species have adapted to life in the oceans where crustaceans tend to predominate. There are approximately 5,000 dragonfly species, 2,000 praying mantis, 20,000 grasshopper, 170,000 butterfly and moth, 120,000 fly, 82,000 true bug, 350,000 beetle, and 110,000 bee and ant species. Estimates of the total number of current species, including those not yet known to science, range from two to thirty million, with most authorities favouring a figure midway between these extremes. The study of insects is called entomology. See more at Wikipedia.org...