Омыртқасы жоқ жануарлар зоологиясының тарихы

Invertebrate zoology is the subdiscipline of zoology that consists of the study of invertebrates, animals without a backbone (a structure which is found only in fish, amphibians, reptiles, birds and mammals). Invertebrates are a vast and very diverse group of animals that includes sponges, echinoderms, tunicates, numerous different phyla of worms, molluscs, arthropods and many additional phyla. Single celled organisms or protists are usually not included within the same group as invertebrates.

In the early modern period starting in the late 16th century, invertebrate zoology saw growth in the number of publications made and improvement in the experimental practices associated with the field. (Insects are one of the most diverse groups of organisms on Earth. They play important roles in ecosystems, including pollination, natural enemies, saprophytes, and biological information transfer.) One of the major works to be published in the area of zoology was Conrad Gessner's Historia animalium, which was published in numerous editions from 1551 to 1587. Though it was a work more generally addressing zoology in the large sense, it did contain information on insect life. Much of the information came from older works; Gessner restated the work of Pliny the Elder and Aristotle while mixing old knowledge of the natural history of insects with his own observations. With the invention of the Microscope in 1599 came a new way of observing the small creatures that fall under the umbrella of invertebrate. Robert Hooke, who worked out of the Royal Society in England, conducted observation of insects—including some of their larval forms—and other invertebrates, such as ticks. His Micrographia, published in 1665, included illustrations and written descriptions of the things he saw under the microscope. Others also worked with the microscope following its acceptance as a scientific tool. Francesco Redi, an Italian physician and naturalist, used a microscope for observation of invertebrates, but is known for his work in disproving the theory of spontaneous generation. Redi managed to prove that flies did not spontaneously arise from rotting meat. He conducted controlled experiments and detailed observation of the fly life cycle in order to do so. Redi also worked in the description and illustration of parasites for both plants and animals. Other men were also conducting research into pests and parasites at this time. Felix Plater, a Swiss physician, worked to differentiate between two types of tape worm. He also wrote descriptions of both the worms he observed and the effects these worms had on their hosts. Swammerdam also worked on a classification of insects based on life histories; he managed to contribute to the literature proving that an egg, larva, pupa, and adult are indeed the same individual.

In the 18th century, the study of invertebrates focused on the naming of species that were relevant to economic pursuits, such as agricultural pests. Entomology was changing in big ways very quickly, as many naturalists and zoologists were working with hexapods. Work was also being done in the realm of parasitology and the study of worms. A French physician named Nicolas Andry de Bois Regard determined that worms were the cause of some diseases. He also declared that worms do not spontaneously form within the animal or human gut; de Bois Regard stated that there must be some kind of 'seed' which enters the body and contains the worm in some form. Linnaeus' universal system of classification made a system based on binomial nomenclature, but included higher levels of classification than simply the genus and species names. Systema Naturae was an investigation into the biodiversity on Earth. The book also included descriptions of the organisms named inside of it. In addition, Darwin collected many species of invertebrate during his time aboard ; many of the specimens collected were insects. Using these collections, he was able to study sexual dimorphism, geographic distribution of species, and mimicry; all of these concepts influenced Darwin's theory of evolution. Unfortunately, a firm popular belief in the immutability of species was a major hurdle in the acceptance of the theory.

Classification in the twentieth century shifted toward a focus on evolutionary relationships over morphological description. The development of phylogenetics and systematics based on this study is credited to Willi Hennig, a German entomologist. In 1966, his Phylogenetic Systematics was published; inside, Hennig redefined the goals of systematic schemes for classifying living things. He proposed that the focus be on evolutionary relationships over similar morphological features. He also defined monophyly and included his ideas about hierarchical classification. Though Hennig did not include information on outgroup comparison, he was apparently aware of the practice, which is considered important to today's systematic research.

The Japanese spider crab (Arthropoda: Macrocheira kaempferi) is one of the world's largest arthropods. The Japanese spider crab is largest known species of crab and may live up to 100 years. With a leg span of that can reach four feet, it has the longest span of any arthropod. They are typically found in the Pacific waters near Japan on the bottom of the continental shelf. The lion's mane jellyfish (Cnidaria: Cyanea capillata) is the largest known type of jellyfish. Their tentacles can reach up to 190 feet long, and they may have a bell diameter of almost 7 feet. These animals are usually found in cold northern Arctic waters and in the Northern portions of the Atlantic and Pacific Oceans. The giant squid (Mollusca: Architeuthis dux) comes from the family Architeuthidae. These squid are both the largest known cephalopod and the largest known mollusc. They can grow to a length of about 45–50 feet long. They developed large eyes, the largest of any animal, to be able to detect small amounts of bioluminescence in the dark and deep ocean where they live.