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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 ...
The caudal fin has a well-developed lower lobe and a longer upper lobe with a ventral notch near the tip. The skin is covered by overlapping, oval-shaped dermal denticles; each denticle has three horizontal ridges leading to marginal teeth. This species is bronze above and white below, with a barely noticeable pale band on the flanks.
The caudal fin is asymmetrical, with a strong lower lobe and a longer upper lobe with a ventral notch near the tip. [2] [4] The dermal denticles are overlapping and bear three horizontal ridges (five in larger individuals) leading to marginal teeth. [9] This species is bronze to gray above and white below, with a white stripe on the flank.
The caudal fin has a longer upper lobe without a notch in the trailing margin, and an indistinct lower lobe. The skin has a dense, uniform covering of non-overlapping dermal denticles measuring up to 0.4 cm (0.16 in) across, which are never fused together as in the bramble shark. Each denticle is thorn-like, with strong ridges running down the ...
The asymmetrical caudal fin has a well-developed lower lobe and a long, narrow upper lobe with a ventral notch near the tip. The prominent lateral line curves downward below the second dorsal fin. The skin is densely covered by small, overlapping dermal denticles; each bears five horizontal ridges leading to marginal teeth. This species is ...
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 asymmetrical caudal fin has an indistinct lower lobe and an upper lobe without a notch in the trailing margin. [9] The skin is covered by a layer of foul-smelling mucus several millimeters thick. [10] [11] The dermal denticles are scattered irregularly over the body and vary greatly in size, measuring up to 1.5 cm (0.59 in) across. Each ...