They never really released them in bundles. They just got on a kick where all of the discs were named after some sort of Animal. So the snake discs didn't come out all at once or the sea creature discs didn't come out in a row or anything like that.
The first Innova discs were the Eagle, Aero, Aviar, Aviar XD (Extra Distance), Coupe, Ace, Roc and Hammer. None of them had animal stamps.
Next came the Stingray, which had the cool "Amoeba" Stingray stamp originally. Then they did the Phenix, Cobra and Shark and retooled the Roc and Hammer. All of them had Animal stamps. From then on, the only Innova disc that did not have an animal stamp was the Zephyr. The Ram didn't either, it always just had the Star stamp but obviously it could have had an animal stamp. I'm leaving the Apple and Super Nova out of this as they are really just sport discs that happen to be legal for golf, not really golf discs.
At the time, Lightning had all WWII airplanes on their stamps and Discraft had mostly weather or space-related stuff like the Cyclone, Vortex, Typhoon, Comet. So they all had a theme.
In 1995, Lightning changed all the discs to label them like golf clubs i.e. # 1 Driver, etc. 1998, Discraft went with the X2-XL-APX-MRX abbreviation names. Also in '98, Innova had it's first non-animal name in a long time...The Banshee. Then they went back to Animals (Rhyno, Wolf, Puma, etc.) but started to mix in things like the TeeBird and Valkyrie. At this point it seems like a hodge-podge of names with no theme. Discraft also has switched from the abbreviations to names like Flash, Surge, Force, etc. No telling where they come from.
But, the stamp used to be a big deal. Ever since Candy plastic came out, they have stopped using the cool DX graphics on most of the discs. So if you don't have to come up with a picture to represent it, you can use a doofy name like "Surge" or "Groove" for a disc. Personally I liked the artwork and wish the DX hotstamps were on all the discs, but I know a lot of folks who argue that it makes golf discs look like toys instead of equipment for a legitimate sport. To each their own.
