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Description
Here I draw a Seismosaurus, in the colors of the Seismosaurus from the king dinosaur series.
Early size estimates suggested this dinosaur was far longer than recent revisions have shown. Seismosaurus has since been reclassified as a species of Diplodocus (D. hallorum), and may in fact be the same as a previously named species, D. longus (though that species is currently seen as a nomen dubium).
As announced at the annual GSA conference in 2004 (and detailed in print since that time), Seismosaurus was really an especially large Diplodocus, although paleontologists have (so far) retained its amended species name to designate the dinosaur as Diplodocus hallorum.
Diplodocus hallorum is a species of diplodocid sauropod dinosaur genus Diplodocus in the extinct genus Diplodocus.
At 120-150 feet Seismosaurus was the longest dinosaur. Diploducus, Supersaurus, Brachiosaurus, and its close relative Ultrasaurus approached lengths of 100 feet.

Seismosaurus appeared in the first and second seasons of Dinosaur King.

The Big Foot Assault move card was found in The Big Apple Grapple in a New York City museum after Terry broke open the Seismosaurus skeleton that Dr. Owen had excavated, apparently coming from the skeleton itself. The card was claimed by Zoe, who had Paris summon Seismosaurus to defeat Terry, Spiny, and Tank on the Statue of Liberty, and also saved Dr. Owen from falling off the Statue.

In the next episode, he was summoned to fight Supersaurus which was being controlled by the Alpha Gang. The two giants briefly battled, and though Seismosaurus began to lose, Chomp took down Supersaurus, leaving Seismosaurus to recover in time to hit and defeat the incoming Altirhinus, thus returning Supersaurus to his card as well.

Seismosaurus was last summoned in Just Plane Crazy, where he defeated Terry and Spiny and shot down the Alpha Gang's crashed rocket off the runway so Reese's plane could land.

Several Seismosaurus appeared in Carnival of Chaos in the Dinosaur World landscape during Dr. Taylor's harmonica song anniversary gift to Aki, A very moving and rare scene.

In the dinosaur war! , a pair of Seismosaurus were brought to the present by the Backlander's time circuitry malfunctioning using the Copy Stones, but were returned after the defeat of the Black T-Rex.

In Mesozoic Fusion, Another Seismosaurus was seen in Fate of the Cosmos aboard the Backlander in its projected Mesozoic landscape after Dr. Z rescued the remaining Space Pirate dinosaurs from his ship.

Description
Here I draw a Seismosaurus, in the colors of the Seismosaurus from the king dinosaur series.
Early size estimates suggested this dinosaur was far longer than recent revisions have shown. Seismosaurus has since been reclassified as a species of Diplodocus (D. hallorum), and may in fact be the same as a previously named species, D. longus (though that species is currently seen as a nomen dubium).
As announced at the annual GSA conference in 2004 (and detailed in print since that time), Seismosaurus was really an especially large Diplodocus, although paleontologists have (so far) retained its amended species name to designate the dinosaur as Diplodocus hallorum.
Diplodocus hallorum is a species of diplodocid sauropod dinosaur genus Diplodocus in the extinct genus Diplodocus.
At 120-150 feet Seismosaurus was the longest dinosaur. Diploducus, Supersaurus, Brachiosaurus, and its close relative Ultrasaurus approached lengths of 100 feet.

Seismosaurus appeared in the first and second seasons of Dinosaur King.

The Big Foot Assault move card was found in The Big Apple Grapple in a New York City museum after Terry broke open the Seismosaurus skeleton that Dr. Owen had excavated, apparently coming from the skeleton itself. The card was claimed by Zoe, who had Paris summon Seismosaurus to defeat Terry, Spiny, and Tank on the Statue of Liberty, and also saved Dr. Owen from falling off the Statue.

In the next episode, he was summoned to fight Supersaurus which was being controlled by the Alpha Gang. The two giants briefly battled, and though Seismosaurus began to lose, Chomp took down Supersaurus, leaving Seismosaurus to recover in time to hit and defeat the incoming Altirhinus, thus returning Supersaurus to his card as well.

Seismosaurus was last summoned in Just Plane Crazy, where he defeated Terry and Spiny and shot down the Alpha Gang's crashed rocket off the runway so Reese's plane could land.

Several Seismosaurus appeared in Carnival of Chaos in the Dinosaur World landscape during Dr. Taylor's harmonica song anniversary gift to Aki, A very moving and rare scene.

In the dinosaur war! , a pair of Seismosaurus were brought to the present by the Backlander's time circuitry malfunctioning using the Copy Stones, but were returned after the defeat of the Black T-Rex.

In Mesozoic Fusion, Another Seismosaurus was seen in Fate of the Cosmos aboard the Backlander in its projected Mesozoic landscape after Dr. Z rescued the remaining Space Pirate dinosaurs from his ship.