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Pests, Hitchhikers, and Diseases Have a pest and need help getting rid of it, or found something cool and don't know if it's good or bad? Does a Critter have an odd spot? This forum is for you!


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Old 08-05-2007, 01:21 PM   #1
Tieg
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Successful Crab trap and critter ID request


Brand new to the forum...my wife and I invested in a 29 gal biocube to start out small until I am out of military housing and into my permanent house 3-6 years down the line Then I figure with the amount of knowledge I will have learned through my experiences as well as the reeftank community I can upgrade to something a little bigger.

Anyhow, back to the subject at hand. I had a couple of hitchiker crabs with the LR we got and was able to coax a crab out with some tweezers cause the hole he was in was not keep enough. We don't want them in there because we learned they can be fish killers and my wife wants fish. Anyhow, we IDed the crab through this website as a gorilla crab(the little guy with hairy legs). The next night we spotted another one and there was no getting this guy out. So I googled "crab traps in reef tanks" and this website popped up. I am not sure who it was that made the suggestion but the idea was from a member from this website (kudos to him). I got one of my bourbon tumbler glasses, submerged it with water and leaned it up against the rock where we had last seen the crab. I took a chunk of uncooked shrimp that we were going to use to cycle the tank and weighed it down with a hook and barrel sinker (yes I like to fish) and then left it overnight. Pic of the setup (critter has already been caught and is in the trap):


This morning I pulled out the glass and viola....one crab awaiting some sort of sentence. I suspect death as my buddy doesn't want him for his refugium so the toilet may be his ultimatum unless someone here has an idea and can post back a reply in time (and no...I prefer king crableg and snow crableg so that option will not be entertained )
Here is a pic of the condemned. If my id as a gorilla crab is wrong please correct:


Now I also have 2 id requests:

The first one is a spongy type mass I found on the side of the rock that obviously was a hitchiker. Its a little bigger then a dime and the color in the photo is about right. Any ideas?


The other request is for a bug like critter that was also a hitchiker with the LR. Its fast and has 2 appendages about where the pincers on a crab would be. It raises these 2 appendages above itself and on the ends are what I would describe as a pair of feather dusters which it is using to capture food as it will bring them to its mouth quite a bit. Sensative to light....I can bring the edge of the flash light onto it but direct light and I will have to wait till the next night to see it. I apologize for the poor pic quality but my camera wants to focus on the rock around it and not the actual critter itself. After about 25 different pictures...thank god for digital...this is what I got:


Anyone who contributes to this thread...thank you for your effort and your time...it is greatly appreciated.
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Old 08-05-2007, 03:25 PM   #2
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I'm not an expert but I've read on this forum that crabs with black pinchers are not usually good news. If the tips of the pinchers are pointed instead of little indented scoops then it's an acro or gorilla crab and you should remove it. If it has the little scoops then it's an algae eater and ok to leave in the tank.

It's a little hard to tell but I would say the spongey thing is indeed a sponge.

The last little critter appears to be a porcelain crab or anemone crab. They use the little "feather dusters" to grab food out of the water.
If you Google for anemone crab and look at Images, you will see lots of examples.
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Old 08-05-2007, 03:38 PM   #3
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Quote:
Originally Posted by LadyReefNeck View Post
I'm not an expert but I've read on this forum that crabs with black pinchers are not usually good news. If the tips of the pinchers are pointed instead of little indented scoops then it's an acro or gorilla crab and you should remove it. If it has the little scoops then it's an algae eater and ok to leave in the tank.

It's a little hard to tell but I would say the spongey thing is indeed a sponge.

The last little critter appears to be a porcelain crab or anemone crab. They use the little "feather dusters" to grab food out of the water.
If you Google for anemone crab and look at Images, you will see lots of examples.
I believe then I got the right crab out of the tank...thanks LadyReefNeck. As for the last little critter...I did indeed google anemone crab and looked at several images...I do not believe it is that species. This critter is more of a bug in nature and literally moves so fast...well it doesn't fly but the next best thing. As for the feather dusters...they are an actual part of the bug and its almost like watching him wave 2 fans in the water. Here is another pic with the fan like appendage raised in the water:

It for sure does NOT have pinchers. Any other ideas?
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Old 08-05-2007, 05:14 PM   #4
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http://www.museum.vic.gov.au/crust/page1.html
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Old 08-05-2007, 05:36 PM   #5
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I now recant and believe LadyReefNeck may be correct. I got a good look at it a few minutes ago and it is indeed a type of crab. From what I have researched on Porcelain Crab it acts just like it. Using its attenae that has filter like fans on it to feed. I also noted it doesn't get very big...because it remains small does anyone believe it could be bad for fish?
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Old 08-05-2007, 06:04 PM   #6
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they are filter feeders, and most do not have the mouthpieces for tearing flesh. Many species have devolved their chelips into either defensive weapons or into appendages that help them hold onto their symbiont. Also consider barnacles as a possibility, I really cannot see what the image is supposed to be, so for me everything is idle speculation until we can get a good pic...


photo courtesy of NOAA explorer site

Another consideration is that is is one of the genus Paguritta hermit crabs that have dropped the habit of carrying a shell for a home and taken up a sessile life style, often inside empty serpulid worm tubes; These will most likely be Paguritta vittata if the rock is from tropical waters originally. Inside, they have straight abdomens (other hermit crabs have curled abdomens) and live their lives totally as filter feeders.


(Photo of Paguritta vittata courtesy www.cosmos.ne.jp website)


More on the feeding mechanism of a related specie: http://www.springerlink.com/content/n446w1053q96q483/
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Last edited by tdwyatt; 08-05-2007 at 06:19 PM.
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Old 08-15-2007, 03:15 PM   #7
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due to the red stripes on the legs, it could aslo be the pom pom anemone crab. as far as the color and stripes on the legs look to me.
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Old 08-15-2007, 05:33 PM   #8
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I would say definitely an anemone crab. There are 2 types (probably more, but I've only seen 2 and they don't look the same). There is a white one and the brown Carribean. Your's looks like the Carribean. The fans are a dead give away to its filter feeding ways.

The Pom Pom has two anemones that it uses to attract food. I don't think you would mistake the mini-anemones for fans.
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