Shade
Monster Junkie
It looks like you and Cleon never reached an agreement on gnaw. I'm impartial on the matter. 
Converting prehistoric creatures
Cleon
Legend
Let's keep it even numbers, so +4 and +10.
Essentially, that's the same as the crocodile, so...
*A yohoia gains a +4 racial bonus on Hide checks when in the water. Further, a yohoia can lie in the water with only its eyes and claws showing, gaining a +10 cover bonus on Hide checks.
Updated.
As an aside, I like these fellas, because I can search for "Yoho" to quickly find 'em in the Homebrews thread. A pirate's life for me!
They bury themselves in mud, remember. They don't lie just at the surface of water crocodile-fashion.
Something like:
Skills: A yohoia has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
*A yohoia gains a +4 racial bonus on Hide checks when in the water or liquid mud. Further, a yohoia can bury itself in liquid mud with only its eyes and claws showing, gaining a +10 cover bonus on Hide checks.
Cleon
Legend
Can we just modify the Improved Grab like the SRD Squid, except with claw damage instead of a bite. It only "gnaws" creatures 2 or more sizes smaller, so it isn't much use against most adventurers.
SRD said:
Improved Grab (Ex): To use this ability, a yohoia must hit an opponent two or more sizes smaller than itself with a claw attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and automatically deals claw damage every round it can maintain the grapple.
I'd say CR 1. They're not far away from a Medium Monstrous Scorpion challenge-wise.
A European Lobster (Homarus gammarus) is typically about 25-40 cm and 0.7-2.2 kg, big one can reach 50-60 cm and up to 6 kg or so. There are records of them reaching 9-10 kg, and a 126 cm lobster was caught in 1931 Cornwall.
Going by that, assuming a Yohoia has a similar build, its 6 foot of length might weigh anywhere between 350 lb and 485 lbs, which suggests an average about 400 lbs.
That's a bit high for my taste, and the reconstructions of Yohoia look a bit slimmer than a lobster, so I'd cut its weight a bit.
300 pounds?
Cleon
Legend
It looks like you and Cleon never reached an agreement on gnaw. I'm impartial on the matter.
I'd rather cut Gnaw and fold the damage into Imp. Grab.
It can't use it against man-sized opponents so there's little point emphasizing it.
Cleon
Legend
The description seems a bit wordy, how many adventures would stop to count its segments and secondary appendages?
How about this:
This segmented creature resembles a cross between a lobster and a woodlouse, with an elongated trunk that ends in a paddle-shaped tail. Instead of a lobster's claws it has two arm-like limbs, each ends in a "hand" of four finger-like spikes. Bulbous formations at the front of its head-shield appear to be eyes.
Also, we should list a Sleight of Hand modifier for its Pilfering Strike (especially as that skill can't normally be used untrained!). Come to think of it, we'd better add some text explaining it can make untrained sleight of hand.
Also, it currently only has a 5% chance per attack of swiping something. I'd rather make it a bit higher. Say give it a +4 racial bonus for 25%?
Putting it together:
Skills: Hide +0*, Sleight of Hand +0*, Swim +9
Pilfering Strike (Ex): With each successful claw attack, the yohoia may make a Sleight of Hand check as a free action to lift a small object from a person (a typical yohoia has a +4 modifier on this check). Yohoia can make untrained Sleight of Hand skill checks with pilfering strike and do not suffer the usual -20 penalty on such checks.
Skills: A yohoia has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
*A yohoia can make Sleight of Hand skill checks for its pilfering strike special attack as untrained skill checks with a +4 racial bonus. It can not use Sleight of Hand to make untrained skill checks for any other action.
*A yohoia gains a +4 racial bonus on Hide checks when in the water or liquid mud. Further, a yohoia can bury itself in liquid mud with only its eyes and claws showing, gaining a +10 cover bonus on Hide checks.
Apart from those two quibbles I think it's good to go.Pilfering Strike (Ex): With each successful claw attack, the yohoia may make a Sleight of Hand check as a free action to lift a small object from a person (a typical yohoia has a +4 modifier on this check). Yohoia can make untrained Sleight of Hand skill checks with pilfering strike and do not suffer the usual -20 penalty on such checks.
Skills: A yohoia has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
*A yohoia can make Sleight of Hand skill checks for its pilfering strike special attack as untrained skill checks with a +4 racial bonus. It can not use Sleight of Hand to make untrained skill checks for any other action.
*A yohoia gains a +4 racial bonus on Hide checks when in the water or liquid mud. Further, a yohoia can bury itself in liquid mud with only its eyes and claws showing, gaining a +10 cover bonus on Hide checks.
Cleon
Legend
Looking at tactics. I don't much like the "similar to a hive of bees" reference since it carries too much social insect baggage (implying a hive-like nest, queens et cetera). I know it's in the original, but it just feels wrong.
I also prefer "opponent's" to "victim's" and "on its fingertips" to "on the fingertips":
When hunting small prey, a yohoia spears its quarry on its fingertips, then folds its arm back to bring the food to its mouth. Groups of yohoia often work together against a common threat, like a swarm of insects. A yohoia's flexible finger-spines have been known to yank off a piece of their opponent's gear.
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