I am sorry to rest writing this report. I will write about unique sharks today.
Great hammerhead (Sphyrna mokarran) sometimes grow more than 6m long. It is the biggest hammerhead shark. I think that hammerhead sharks have one of the most unique head in vertebrate.
Helicoprion is popular for its coiled row of teeth, but no one had known where and how they had been when he had lived for long time. But in 2013, a research showed that they had been in lower jaw like a circular saw. It is said that these teeth are used for slashing his prey like nautiluses or ammonites.
Jaws and teeth of variety of sharks. They are quite different for their own food and use.
Jaw of spotted ratfish (Hydrolagus colliei) is use for cracking shells of prey like shellfish or crab. Ratfishes are known as the living fossils.
Jaw of Port Jackson shark (Heterodontus portujacksoni) is also useful for crushing shells. Japanese bullhead shark, relative to him is sometimes called “sea snail crusher” in Japan.
Sawsharks and sawfishes have quite similar not only figures but also behaviors. Both of them uncover sand on the seabed with their ” saws” to search their food. The most different point is position of their gills. Sawsharks’ gills are side of their body. On the other hand, sawfishes’ gills are underside of their body.
Common thresher shark (Alopias vulpinus) has very long tail fin. it accounts for about half of his length. This tail is the dreadful weapon for small fish.
Jaw and teeth of goblin shark (Mitsukurina owstoni) are eerie. In addition, this jaw rushes out when he bites.
Megamouth shark (Megachasma pelagios) is in permanent exhibition. He has big mouth as his name, but his body is also huge.
The space of the exhibition was not so big, but There were so many specimens there. This exhibition showed almost all of sharks.
Japanese Dino-mania 