and Devonian periods‚ These jawless fish were small‚ armored‚ bottom-dwelling freshwater filter feeders. The head was covered with thick bony plates‚ and the trunk and tail were covered with thick scales. Ostracoderms had median fins; some species had paired pectoral fins. The living relatives of the Ostracoderms are the lampreys and hagfishes. These animals have cylindrical bodies up to a meter long
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* Squalus acanthias –Atlantic spiny dog * Squalus suckleyi – Pacific spiny dog PARTS: 1. Body and skin * Body‚ SPINDLE SHAPE‚ advantageous for free- swimming animals * Body‚ pointed at each other a. TRUNK AND TAIL – provide fins for locomotion b. BODY- clothed with SCALES (each of which bears a tiny spine * Rough feeling of skin caused by the spines * LATERAL LINE – whitish line‚ along each sides of the body; * Lateral line overlies the LATERAL-LINE
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hold its prey. They eat squid‚ fish‚ and crustaceans. The dogfish shark as of all sharks have been around for as long as dinosaurs. If the shark is a female the uterus is the function of the egg developments‚ if a boy there is testes an oval shaped; dorsal to the liver. Males have claspers finger-like projections that assist in sperm transfer during mating‚ this occurs only in males. Ovaries are two
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but also their physical appearance. One of the most salient physical effects of captivity is dorsal fin disfiguration. In the captive population‚ almost every male has a flopped dorsal fin‚ and most females have at least some bend to their dorsal. In the wild‚ male dorsal fins can exceed heights of six feet straight up. The best theory is that the dorsal fin flops from the force of gravity. Dorsal fins are made of cartilage‚ not bone. Orcas are one of the fastest mammals in the sea; they can reach
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width‚ and 2.1 meters in height‚ he is a 12‚000 pound whale. Because the tanks are shallow‚ they have to spend time near the surface of the water. Gravity then acts on the dorsal fin and causes it to droop. The article “8 Reasons Orcas Don’t Belong at Seaworld” also states‚ “All captive adult male orcas have collapsed dorsal fins‚
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Pins were inserted on each specimen at all the landmark prior to taking photograph. Before taking picture‚ fishes were cleaned with freshwater and placed on a dissecting pad‚ the left side of the body of fish facing up. The fins of each fish were spread out and pinned in place to provide a clearer view of insertion points into the body. A scale was placed against the lower edge of the dissecting pad. Eleven pins were inserted on each specimen at all the landmarks prior to
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Vertebrate Zoology Study Guide I. Taxonomy 1. Reasons for Taxonomy a. means of providing a systematic framework with which to work when studying the varied life forms inhabiting this earth b. establishes order from chaos c. Provides a system of nomenclature with which you label items (organisms) d. necessary when imagining trying to gather information on an unfamiliar organism e. Meant to provide a useful‚ convenient system using all evolutionary‚ adaptational‚ and anatomical aspects
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is a brownish colour‚ and often resembles a rock. This is why it is called the Stonefish. It has thirteen sharp dorsal spines on its back‚ which each have extremely toxic venom. Description The Stone Fish is a a mottled brown-greenish in colour (which makes them camouflaged) with many venomous spines along its back. The Stone Fish is only dangerous if stepped on or caught. 13 dorsal spines project from venomous glands along the back . The venom is involuntarily expelled when pressure is applied
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because they all have an internal backbone. III. In researching this particular topic‚ I learned that the most important characteristics used in fish classification are the type of bone in their skeleton‚ the gill structure‚ the number and shape of fins‚ and the type of scales. IV. Now I will introduce you to the characteristics and the three different classes of fish. “Jawless (Agnatha)‚ Cartilaginous (Chondrichthyes)‚ and Bony Fish (Osteichthyes). Body I. The Agnatha class is the oldest
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With a total of 23 beautiful orca whales‚ it is no surprise SeaWorld attracted 4.4 million tourists in 2014. These millions flock to watch the black and white beauties swim‚ splash‚ and wave in front of huge audiences and charismatic trainers‚ but these millions might not be so excited once they watch‚ Blackfish. In the documentary‚ Blackfish‚ filmmakers attempt to discredit the SeaWorld corporation‚ for compromising the welfare of captive orcas for a higher financial gain. Blackfish caused quite
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