Search results
Results from the WOW.Com Content Network
Sharks Don't Get Cancer (subtitle: How Shark Cartilage Could Save Your Life) is a 1992 book written by I. William Lane and Linda Comac and published by Avery Publishing. Despite its title, the book does not claim that sharks never get cancer , only that they rarely do so, a fact which has been known since the first malignancy was found in a ...
The pelvic and anal fins are about as large as the dorsal fins. The broad caudal fin comprises about a fifth of the total body length and has a strong notch near the tip of the upper lobe and an indistinct lower lobe. The skin is thick and covered by well-calcified arrowhead-shaped dermal denticles. The coloration of the dark shyshark is highly ...
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 backbone runs through the upper lobe at a lower angle than the lobe itself, reducing the amount of downward thrust produced.
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 ...
Each upper tooth has a narrow smooth-edged central cusp flanked by 1–2 tiny cusplets; mature males over 38 cm (15 in) long grow additional pairs of lateral cusplets with age. The lower teeth are smooth, knife-like, and angled, with their bases interlocking to form a continuous cutting surface. The five pairs of gill slits are long. [2] [4]
The skin is very thick and covered by well-calcified dermal denticles. There is a prominent row of enlarged denticles, resembling saw teeth, along the upper edge of the caudal fin. [ 16 ] The body is grayish-brown above, with 15–18 dark, rounded saddles, blotches, and/or spots that run onto the tail; each marking is highlighted by a paler border.
The broad caudal fin comprises a fifth of the total length; the upper lobe has a deep ventral notch near the tip and the lower lobe is virtually absent. The skin is thick and covered by well-calcified, leaf-shaped dermal denticles. The coloration is brown above and white below; the brown shyshark is usually plain while the other species have ...
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 ...