← Invert: Chapter 5 Part I Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All True True or false: Muscles can only move liquid around, not compress it (i.e the volume with always stay the same). Eumetazoans True metazoans. No coelom, but they have organs and a nervous system Body characteristics of the Cnidarians. Radial What kind of symmetry do Cnidarians have? Diploblastic (acellular mesogloea) What kind of organization do Cnidarians have? Cnidocytes (stinging cells) What type of cells are unique to the Cnidarians? Nematocyst Thread capsule/bag. Incomplete gut (serves as a hydrostatic skeleton) What kind of gut do Cnidarians have? The food goes out the same way it came in, and if the Cnidarians close their gut, they can use it as ____________ Simple nervous system (nerve net) What kind of nervous system do Cnidarians have? Dimorphic life cycle What kind of life cycle do Cnidarians have? They are structurally the inverse of each other What is the basic difference between the polyp and medusa stage of Cnidarians? Medusa stage Which stage of the Cnidarian life cycle is the sexual stage? Polyp stage Which stage of the Cnidarian life cycle is normally asexual? Fission, budding, and pedal laceration What are three types of asexual reproduction displayed by Cnidarians? Generally the medusa (mostly dioecious), and you see aggregations What stage do you normally see sexual reproduction in, and what kind of groups of organisms? Dioecious (male releases sperm, female releases eggs) or monoecious (individual releases both sperm and eggs) What kind of sexual individuals do Cnidarians have? Planula stage Ciliated larva stage Scyphistome Polyp stage Strobila Polyp starts to bud by strobilation. Ephyra Strobilated polyp releases an "immature medusa" individual known as a(n) _________. Medusa Sexual stage of Cnidarian, after the Ephyra stage. Planula, Scyphistome, Strobila, Ephyra, and Medusa List the stages of the Cnidarian life cycle, starting with the larva stage. Medusozoa and Non-medusozoa What are the two major subclasses of Cnidarians? Scyphozoa What class of cnidarians do jellyfish and sea jellies belong to? Cubozoa What class of cnidarians do sea wasps, cubomedusae, and box jellies belong to? Hydrozoa What class of cnidarians do hydroids, hydromedusae, siphonophores, and hydrocorals belong to? Anthozoa What class of cnidarians do anemones, corals, sea whips, sea pens, sea fans, sea pansies, and corals belong to? Myxozoa What class of cnidarians do highly degenerate endoparasites belong to? Cassiopeia Upside-down jelly. These can operate by photosynthesis. Linuche unguiculata This thimble jellyfish is also known as "Sea lice" and causes Sea bather's eruption. The planula larvae have stinging cells. Osmotic change of fresh water What causes the sudden eruption of all of the nematocysts of the Sea lice larva? Cubozoa This class of cnidarians contains some of the most potent poisons known to man. 4 sets Box jellies have tentacles in set of __. Cubozoa What class are sensory organs incredibly advanced in? Rhopalia Cubozoan with fairly advanced eyes, and lens. This cubozoans can pick out images, but have no CNS. Chironex fleckeri Box jellies or "sea wasps". Irukandji (carukia barnesi) Tiny little box jellies that are almost invisible in the water. You won't feel much of anything after initial contact, but eventually nausea and extreme cramps. Doctors are not able to do anything to ease the pain, they can merely keep you alive until it is over. Hydroida, Siphonophora, and Hydrocorallina What are the three orders of the Class Hydrozoa? Polyp or medusa. Some are solitary and most are colonial. Characteristics of the Order Hydroida. Craspedacusta sowerbyi Freshwater jellyfish (one of the few). Gastrozooid (hydranth, feeding), gonozooids (reproduction), dactylozooid (defense) What are three types of Colonial Hydrozoa? Dactylozooid What zooids contain the most potent nematocysts? Thecate = theca is covering, Athecate = theca is not covering What is the difference between thecate and athecate? Pneumatophore Specialized bladder filled with air. Used for floating and "sailing" on the water. Siphonophora Which order of Cnidarians is colonial, and has pneumatophores? Pelagic (found in the open sea) Where are Siphonophora normally found? Physalia, Muggiaea sp., and Vella sp. (Chondrophora?) What are three pelagic species from the Order Siphonophora? Bioluminescence What do deep sea siphonophoran use for lighting and attracting prey? Hydrocorallina Known as "Fire Coral". These coral have a calcium carbonate skeleton, and are not considered true corals. Millepora spp. A species of Hydrocorallina, not considered a real coral.