They spawn most commonly in the swamps north of the southern islets connecting to green ob, spawn slightly less commonly in the western swamp marshes, then spawn least common in the main writhing swamps south of the redwoods.

I impregnated rhymognatha of host bronto lvl 226 and it impregnated by rhymognatha lvl 140 but after rhymognatha born it's level is only 47 an it show that she follows me but she can't walk that's why I can't completed 2 imprinting that's is walk with me so guys have you any solutions

Riding a frog doesn’t aggro them!

For the guy who said it is scary to encounter on a pt, it is also scary on a max level argy. 😟

THEY ARE NOT RARE AS THE DODODEX SHOWS!!!! they are everywhere on the swamps near redwoods. THEY SPAWN IN GROUPS! THEY AGGRO FROM FAR AWAY! THEY ARE FAST!!! THEIR ATTACKS CAN DISMOUNT YOU!!! THEY ARE ABOMINATION INCARNATE!!!!

IDK how I'm soposed to manage to get a giga egg even though I have yet to come to see one

Run thats all i have to say if you are not prepared RUN THE OTHER WAY, RUN HOME, RUN OUT OF THE SWAMP, RUN OUT OF THE REDWOODS, JUST GET AWAY FROM THOSE MONSTERS THEY TOOK EVERYTHING FROM ME

Turn around and kill it with shotgun, if you don't have a strong gun you might think you can run your way out but you can't, you're dead

Taming these things are confusing, but I believe I have figured out how they work.

Step 1 is to kill a wild rhynio (can be any gendrr) to get the pheromones, next it is best to make a trap, the best design i know of is basically a stone dino gate griffin trap, but with behemoth gates. Next you want to find a high level wild female rhynio. Think of the level of the rhynio as the taming effectiveness you will recieve 150 being max. Next you need to lower the rhynio to below 10% hp, you can net them to make this easier. Once it is below 10% hp you need a mount with a high drag weight in order to inherit the best stats, carch/giga have best chances. Feed the creature the phermone and mount it. The rhynio should impregnate it within a few seconds. DO NOT CRYOPOD THE DINO IT IMPREGNATED! YOU WILL LOOSE THE BABY! once your tame is impregregnated it will go through a gestation period and ask for cravings. It is important you furfill as many as possible as they have a major effect on the level the offspring will be and the stats inherited. Once the timer is complete your dino will fall unconscious and die, however you will now have a new perfect tame rhynio!

The Paraceratheriums can eat the pheromones too which is extremely helpful because they are easy to tame, practically useless AND they live in the same area as the Rhyniognatha!

“Wahoo! My genius plan to kill a male worked! Now I just have to search my 25 carnivores for the pheromone… AAAAAAAAAAAAAARRRGGGHHHH!!!!!!!!!!!!!”

Do not use to steal wyvern eggs, too slow, only use if you are sure there are no wyverns, if you have resin, take the wyverns one by one, but be VERY cautious.

rare is not it for ark mobile. these things spawn in a freakinf PACK

This thing is jack of all trades master of all. you want to farm its got you covered, you need to go in the ocean this thing can swim pretty, fast you need to murder everything in the tristate area its on it. this thing will do it all.

As of November 2025, their ai on mobile ark still sucks.

When wild this thing can and will target megalodons but it can't go in water so it will either wait until the megalodon swims high enough to melee attack it, or it will start shooting resin at it until it dies, so this proves that megalodons are inferior to carnos and similar to sabertooths and raptors in the predator and prey hierarchy. And since nothing attacks each other in the ocean, this also proves that mosasaurs and plesiosaurs are similar to the megalodon so in theory they can be aggroed on by any rex, giga, carcharo, yuty, allo, megatherium, or rhynio.

First time I ran into this nightmare, I was flying about the swamp and redwood area with my newly tamed argy, the first tamed argy actually. I saw it and thought yeah i'mma tame this too.*equips bow, *loads tranq arrows, *pinpoint accuracy. Big bug now is aggrod on me and is coming closer and realise, this isn't a big bug, it's a pissed off unit heading towards me.

First hit, argy was on passive... Rushes the bug, gets folded like an omelette.

Me at this point, just genuinely flabbergasted by the sheer brute force the bug exhibits.

Died trying to tranq it (only managed 2 shots)

For any noob, see this thing, RUN

They are literally the worst on ark mobile ultimate edition.

Not rare, incredibly aggressive, and like to wander. I tamed myself a lvl 60 thyla and it got killed on the way home by these guys as I was running away. Luckily, I got it back by cheating slightly(back up save… it’s literally a savior for crappy situations). I’m planning on taming a spino (my favorite tame ever) so that I can travel in the swamps again but with the ability to destroy these idiot supersized mosquitoes. Good luck you guys, stay away from the swamp if you can help it🤣

This annoying creature jumped me early on on my first parasaur while I was looking for raptors, just run if its early game, try

To the guy that said if the cravings are needed or if they improve the rhynio level: Cravings heavily depend their level, you could have two extremely high level parents (check other tips for taking these suckers if your confused on the term “parents”) but only get a level 30-40 rhynio. Hope this helps!