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The majority of animal species are invertebrates; one estimate puts the figure at 97%. [1] Many invertebrate taxa have a greater number and diversity of species than the entire subphylum of Vertebrata. [2] Invertebrates vary widely in size, from 10 μm (0.0004 in) [3] Myxozoans to the 9–10 m (30–33 ft) colossal squid. [4]
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 ...
Bryozoa (also known as the Polyzoa, Ectoprocta or commonly as moss animals) [6] are a phylum of simple, aquatic invertebrate animals, nearly all living in sedentary colonies. Typically about 0.5 millimetres (64 in) long, they have a special feeding structure called a lophophore, a "crown" of tentacles used for filter feeding.
Invertebrate common names (2 C, 13 P) E. Extinct invertebrates since 1500 (1 C, 55 P) I. Individual invertebrates (3 C) L. Lists of invertebrates (7 C, 14 ...
L. List of least concern invertebrates. List of brackish aquarium invertebrate species. List of marine aquarium invertebrate species. List of sponges of Venezuela.
List of animal names. Mother sea otter with sleeping pup, Morro Bay, California. In the English language, many animals have different names depending on whether they are male, female, young, domesticated, or in groups. The best-known source of many English words used for collective groupings of animals is The Book of Saint Albans, an essay on ...
In the 1959 Treatise on Invertebrate Paleontology, [60] what are now members of orders Ptychopariida, Asaphida, Proetida and Harpetida were grouped together as order Ptychopariida; subclass Librostoma was erected in 1990 [61] to encompass all of these orders, based on their shared ancestral character of a natant (unattached) hypostome.
Placozoa. Placozoa (/ ˌplækəˈzoʊə / PLAK-ə-ZOH-ə; lit. 'flat animals') [3] is a phylum of marine and free-living (non-parasitic) animals. [4][5] They are blob-like animals composed of aggregations of cells. Moving in water by ciliary motion, eating food by engulfment, reproducing by fission or budding, placozoans are described as "the ...