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Bottom-dwelling sharks such as catsharks and carpet sharks have tails with long upper lobes and virtually no lower lobe. The upper lobe is held at a very low angle, which sacrifices speed for maneuverability. These sharks generally swim with eel-like undulations. Dogfish sharks also have tails with longer upper than lower lobes. However, the ...
The blacknose shark has a slender, streamlined body with a long, rounded snout and large eyes. A well-developed flap of skin occurs in front of each nostril, defining the inflow and outflow openings. Twelve to 13 and 11 to 12 tooth rows occur on either side of the upper and lower jaws, respectively, with one or two teeth at the symphysis ...
Furthermore, this shark has prominent black tips on its pectoral fins, second dorsal fin, and caudal fin lower lobe. The Pondicherry shark is critically endangered. It was once found throughout Indo-Pacific coastal waters from the Gulf of Oman to New Guinea, and is known to enter fresh water. Fewer than 20 specimens are available for study, and ...
The caudal fin is broad, with the lower lobe almost as large as the upper, which has a prominent ventral notch. [3] [6] The dermal denticles are squarish and flattened, with a slight central concavity and raised corners. The cookiecutter shark is chocolate brown in color, becoming subtly lighter below, and a dark "collar" wraps around the gill ...
The speartooth shark (Glyphis glyphis) is a rare species of river shark, ... The caudal fin is asymmetrical; the lower lobe is narrow and well-developed, ...
The asymmetrical caudal fin has a strong lower lobe and a longer upper lobe with a ventral notch near the tip. [4] [5] The dermal denticles mostly do not overlap; each has three to five horizontal ridges leading to posterior teeth, with the central one the longest. This shark is plain gray to slate above and whitish below, with a faint lighter ...
The tiger shark must be able to twist and turn in the water easily when hunting to support its varied diet, whereas the porbeagle shark, which hunts schooling fish such as mackerel and herring, has a large lower lobe to help it keep pace with its fast-swimming prey. [38]
The Borneo shark (Carcharhinus borneensis) is a species of requiem shark, ... The asymmetrical caudal fin has a well-developed lower lobe and a longer, narrow upper ...