Anatomy and Appearance
Male Goblin sharks commonly grow between 2.4 and 3.1 m (7.9 and 10 ft) long and females between 3.1–3.5 m (10–11 ft). The largest verified specimen was 3.9 m (13 ft) and weighed 210 kg (460 lb), although one unusual specimen was estimated to measure an enormous 6.2 m (20 ft). They have the typical shark's semi-fusiform body. Unlike the common image of sharks, M. owstoni's fins are not pointed and instead are low and rounded, with the anal and pelvic fins significantly larger than the dorsal fins. Their heterocercal tails are similar to the thresher shark's, with the upper lobe significantly longer proportionately than other sharks'. In addition, the goblin shark's tail lacks a ventral lobe.
The pink coloration, unique among sharks, is due to blood vessels underneath a semi-transparent skin (which bruises easily), thereby causing the coloring. The fins have a bluish appearance. Goblin sharks lack a nictitating membrane. They have no precaudal pit and no keels. The front teeth are long and smooth-edged, while the rear teeth are adapted for crushing.
Up to 25% of the goblin shark's body weight can be its liver. This is similar to other sharks, such as the basking shark and the frilled shark, and contributes to the buoyancy of the shark, which, like all sharks, lacks a swim bladder.
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