sawshark

Japanese Sawshark (Pristiophorus japonicus)

…a species of sawshark (Pristiophoridae) which occurs in the northwest Pacific Ocean around Japan, Korea, and northern China, where it inhabits the sandy or muddy bottoms of the continental shelves (at depths of 50-800 m). Japanese sawsharks are primarily “benthic” and will feed on a wide range of small bottom dwelling invertebrates and fish. 

Classification

Animalia-Chordata-Chondrichthyes-Elasmobranchii-Pristiophoriformes-Pristiophoridae-Pristiophorus-P. japonicus

Image: Opencago.info

Sawfish (Family Pristidae) and Sawsharks (Family Pristiophoridae) are commonly mistaken for each other. It’s pretty easy to do that, since they’re both really unique predators built for a gnarly kill with their intense saws for teeth. They’re both elasmobranchs, making them distantly related. The sawshark is, you guessed it, a shark! The sawfish, on the other hand, is a ray. Sawsharks also have two barbels that stick out in the middle of their saws, resembling whiskers, and happen to work like that of a catfish. They feel along the ocean floor for any potential prey, which is something saw fish can’t do. Also, sawfish have gill slits on their undersides like a typical ray, whereas sawsharks have gill slits on their side like a shark. Makes sense, eh? Saw sharks have alternating teeth sizes, making them look a bit more unkempt, whereas sawfish have a nice polished look with evenly sized teeth all around. This sucks for the tidy sawfish though, since unlike that unorganized sawshark, his teeth don’t grow back. It’s cool though, since they’re bigger than sawsharks. Measuring in from 1.4 m (4.6 ft) to 7 m (23 ft), sawsharks can barely compare at up to 1.7 m (5.6 ft) long. 

The African Dwarf shark (Pristiophorus nancyae) - one of four new shark species found in 2011.

Christine Dell'Amore

National Geographic News

The African dwarf sawshark (Pristiophorus nancyae) was accidentally captured in a 1,600-foot-deep (490-meter-deep) trawl off Mozambique. The animal is only the seventh species of sawshark known to science, according to David Ebert, a research associate at the Academy.

The predator has a long, tooth-studded snout that it uses like a sword, whipping the appendage through schools of fish and then returning to eat any casualties.

Along with the sawshark, a new species of angel shark, Squatina caillieti, was named from a single specimen collected in 1,200-foot-deep (370-meter-deep) water off the Philippine island of Luzon, Ebert said.

Bottom-dwelling angel sharks, whose large pectoral fins resemble wings, lie partially buried in sediment and ambush passing prey.

In addition, two species of lanternshark in the Etmopterus genus were also discovered in Taiwan and South Africa, respectively.

The discoveries are part of a recent boom in new shark and ray finds. Over the past decade, about 200 new species have been described, compared with fewer than 200 in the previous three decades, Ebert said.

Despite these advances in describing new sharks, scientists know very little about the predators’ behaviors or their populations, he added.

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Rules:

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          me 

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          lnalloweentown

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          spookyselfiepolice

Thats it! We will pick the winners on Wednesday, October 30 to be promo’d! Good luck to everyone!!!!!!

NEW SPECIES OF SAWSHARK DISCOVERED OFF PHILIPPINE ISLANDS

The newly discovered species, named Pristiophorus lanae, is the second member of the genus Pristiophorus described from the western North Pacific.

Pristiophorus lanae is a slender-bodied five-gilled sawshark, measuring up to 80-85 cm in lenght. It is known from seven specimens (six females and a single male), caught off Zamboanguita, Apo Island between Negros and Siquijor, and off southern Luzon in Balayan Bay and Ragay Gulf, the Philippine Islands.