Spiderants are another returning creature from the first game and are four-legged things that don't really look like anything in particular. Their bodies are covered in a hard armor-like shell, which can reduce the damage you do if you happen to keep striking those parts of their body. However, if you head to their rear, you will find their abdomen is exposed, which is their weak point. It can prove to be a challenge to get behind them, though, but if you strike their head enough in quick succession, they can become stunned and turn around to expose their abdomen.
The weakest variant of the Spiderant, the Spiderling is relatively weak and doesn't do much besides lunge at players and swipe with their claws at melee range.
Workers are similar to Spiderlings, but are stronger than them. They even have pretty much the same attacks.
Soldiers tend to stay away from you and shoot web-like balls from a distance. Their abdomens are pretty large, making it easy to score a critical hit.
Knights, as their name suggests, are armor-heavy foes that are more defensive than offensive. It's more difficult to score a critical hit on them than other Spiderants and they also have an AoE attack that doesn't do much damage.
Sentinels are stronger than normal Spiderants that are bodyguards for the Queen Spiderant.
Kings are stronger versions of the Workers, able to deal more damage and having a harder-to-hit abdomen. They are able to leap much bigger distances, as well as rarely shoot web-like balls at you from a distance.
You will never find a Queen that is alone, as they will always have a Sentinel nearby. They attack similarly to Soldiers, as they hang back and shoot web-like balls at you. If you happen to kill one via shooting their abdomen, the Queen will release Spiderlings.