In honour of 40k's 25th Birthday this year, I'm working at an ongoing series called "The Tyranid Archive," which is meant to be a historical look back on where Tyranids came from and how far they've come. Here's our last installment, for now, tracking the chronology of the main Tyranid model line's evolution. However, there are some gaping holes in this chronology that I'm trying to get some help to fill (Space Hulk? Genestealer Cults?), so those may be cropping up soon.

5th Generation (2010, 2012)
(Also known as The Age of The Trygon, Great! New Units!...Now Where Are The Models?, and Oh You'll Get Your Second Wave...Someday)
With this article, we're brought up to the current generation of Tyranid models and rules. As it's the one that current Tyranid players are most familiar with, I won't spend much time talking about the rules. However, some notable changes from 4th Generation/Edition for those of you who only started Nids recently were things like the strength and number of shots of ranged weapons going back to being an absolute value, rather than based on the strength/attacks of the creature carrying them. Our Niddy guns hadn't been like this since second edition, and though it makes things a little easier, I far preferred when the creature influenced the strength/attacks. It made for comedic possibilities like Carnifexes totting Str 9 or 10 Fleshborers. Then again, the new system makes things like devourers a little more useful on gaunts
Just like with my 4th Generation write-up last week, I'll be skipping over the tried-and-true models that remained in service from the old codex refresh through to the new one. However, If you're keeping score: Plastic Gaunts, Hormagaunts, Rippers, Warriors, Genestealers and Carnifex; Metal Hive Tyrant, Lictor, Tyrant Guard, Broodlord, Biovore, Spore Mines, and Zoanthrope.
With all those ranked up, you'd wonder what model slots were left to fill in the Tyranid range. Well, that'd be a good question because there weren't any. We had models for every unit in the 4th Generation Tyranid Codex. So how was Games Workshop going to justify a new Tyranid Codex? How were they going to sell new models if people already had access to the whole of the range?