This feature is called an "operculum." B. Cnidarians are triploblastic, having ectoderm, mesoderm, and endoderm. Sharks and rays have open, naked gills (see Table 4.14), meaning that they are not covered by an operculum. Depending on the time of day, different areas of the intertidal zone may be wet or dry. Bony and cartilagenous fish. However, sharks do not have this covering. The forebrain is responsible for the bony fish's ability to smell. Fish … Blind bony fishes, such as blind cavefishes in the family Amblyopsidae, have … Fish scales. There are usually between five and seven gill arches, each bearing one gill slit. Sharks also have a pair of spiracles in front of their gills (one on each side). Bony fish may also have distinct rays, or spines, in their fins. All fish are covered with overlapping scales, and each major group of fish has its own special type of scale.Teleosts ('modern' fish) have what are called leptoid scales. Most kinds of fish have bones.Some kinds of fish, such as sharks and rays, do not have real bones.Their skeletons are made of cartilage, and so they are known as cartilaginous fish.. Sharks are fish and, like other species of fish, use gills to breathe rather than lungs. They have scales, gills, and paired fins. Each of the rooms has a Natural historian who will give a lecture about each creature for which the quiz is based on. This is still evidential in several species termed "dogfish," or the porbeagle.The etymology of the word "shark" is uncertain, the most likely etymology states that the original sense of the word was that of "predator, one who preys on others" from the Dutch schurk, meaning "villain, scoundrel" (cf. Organisms in this habitat must be able to adapt if they are left “high and dry” when the tide goes out. They also lack bone marrow. A. Cnidarians can have two body forms, polyp and medusa. Both bony fish and cartilaginous fish breathe through gills, but bony fish also have a hard, bony plate covering their gills. Bony fishes that have an especially good sense of smell, such as eels, have an enlarged forebrain. In most other fish species, these gills are covered by the operculum, which acts as a lid over the gill. Most elasmobranchs have five gill openings—exceptions include the six gill and seven gill shark. They can … To define and be able to use the terms: operculum, gill filaments, gill lamellae/plates and buccal cavity when describing the above. Although they have a skeleton, they lack a ribcage; thus, if taken out of water, they will die, because their body weight will crush their internal organs. Sea snails such as periwinkles have a trap door called an operculum that they can close when they are out of the water to keep moisture in. 3. Their classification name, elasmobranch, actually means naked gill. Sharks do not have an operculum, or an opercular cavity, but have instead a branchial cavity and a series of branchial flaps (one for each set of gills, but which work in a similar way). The natural history quiz is the basement section of the Varrock Museum miniquest. Etymology. Modern sharks began to appear about 100 million years ago. C. Cnidarians have radical symmetry. E. Cnidarians have specialized cells called cnidocytes with nematocysts inside. Until the 16th century, sharks were known to mariners as "sea dogs". Table 4.14. Fossil mackerel shark teeth date to the Early Cretaceous.One of the most recently evolved families is the hammerhead shark (family Sphyrnidae), which emerged in the Eocene. All bony fishes have sutures in their neurocranium and segmented fin rays derived from their epidermis. D. Cnidarians do not have circulatory, respiratory, or excretory systems. It consists of 14 creature displays in which the player must answer 3 questions correctly in order to earn 2 kudos each for a total of 28. A heterocercal (where the top lobe is larger in size than the bottom lobe) tail in sharks helps them in locomotion. The midbrain processes vision, learning, and motor responses.
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