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id please


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#1 bobf

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Posted 28 April 2004 - 05:54 PM

This image was captured on a night dive under the Town Pier in Kralendijk, Bonaire. The critter in question was walking. This is a full frame image, no crop, full telephoto ( 21mm) on an Oly c4040. Would anyone care to make an educated guess?

tia,
bob

ExposureTime : 1/400Sec
FNumber : F4.0
ExposureProgram : Manual
ISOSpeedRatings : 100
DateTimeOriginal : 2004:03:11 21:04:09
MeteringMode : Spot
LightSource : DS 125 TTL
Flash : Fired
FocalLength : 21.00(mm)
oly 4040 and a pair of DS 125's
Inon Macro and an Oly WAL

#2 james

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Posted 28 April 2004 - 06:06 PM

Decorator crab covered in hydroids.

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#3 bobf

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Posted 28 April 2004 - 06:47 PM

thanks james....
oly 4040 and a pair of DS 125's
Inon Macro and an Oly WAL

#4 Leslie

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Posted 22 July 2004 - 03:24 PM

Hi --

Decorator crab with hydroids? Really? I can't see a single articulated joint, those white spots are way too regular for attached detritus, and the knobby bits are all along the edges. My guess is a juvenile frogfish or something related.

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#5 james

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Posted 22 July 2004 - 04:18 PM

Your guess is certainly as good as mine.

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#6 JPS

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Posted 23 July 2004 - 01:07 AM

Bob,

can you post full-res crops that would better enable looking for eyes? If you have shots from various angles that would be even better.

Br,
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#7 bdickson

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Posted 23 July 2004 - 04:43 AM

I go with the decorator crab theory. Try sending a copy to Leslie Whaylen at REEF (leslie@reef.org). She has identified some weird critters for me over the years.

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#8 Art

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Posted 23 July 2004 - 09:44 AM

Hi folks

HMMMM ... was it walking like a crab or crawling slowly ?

in decorator crabs you usually see at least a few legs .. so I would say it's a juvenile sponge crab (Dromiidae) or a hermit carrying a sponge-, colonial tunicates- and maybe hydroid-overgrown shell

next time just turn the animal to see it from all sides ! and there will be no misteries :)

ciao

Art

#9 echeng

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Posted 23 July 2004 - 09:51 AM

bobf - in the future, can you be a bit more specific in the subject-line of your id request posts?

you know, something like "ID for crab in Bonaire"
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#10 Giles

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Posted 23 July 2004 - 11:39 AM

being fair to bob .. he didn't know it was a crab, but i would also go with something like a frog fish .. it doesnt look very crab like to me.
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#11 james

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Posted 23 July 2004 - 11:45 AM

Sponge crab is also an excellent guess. Sometimes, w/ a well set-up sponge crab, you can't see the crab at ALL.

Here's a not-so-well set-up sponge crab:

Posted Image

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#12 echeng

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Posted 23 July 2004 - 11:47 AM

being fair to bob .. he didn't know it was a crab, but i would also go with something like a frog fish .. it doesnt  look very crab like to me.


As much info as possible would be better than having a string of posts called "id please" :)

You know: location, description, etc.

Just trying to keep all this info as organized as possible...
-e
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#13 bobf

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Posted 23 July 2004 - 01:49 PM

If you have shots from various angles that would be even better.


I took only one image.

As much info as possible would be better than having a string of posts called "id please"


Agree.

can you post full-res crops that would better enable looking for eyes? If you have shots from various angles that would be even better.


I increased the image to 100% and cropped accordingly.

imho and as I recall, it moved similar (consistent gait) to other crabs I have observed. It appeared underwater to be about in the 5 cm range in size. I've observed larger frogfish move, but not with similar coordination.

The forward movement of the creature was from right to left. iow, it was moving towards the left side of the image at time of capture.

Thanks to all for their interest and input. In the future I will document more carefully. This thread has taught me the importance of multiple views and better note taking.

regards,
b
oly 4040 and a pair of DS 125's
Inon Macro and an Oly WAL

#14 james

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Posted 23 July 2004 - 02:57 PM

Interesting! To me, it looks like a cut out piece of a barrel sponge - along w/ the commensal zooanthids that live on that type of sponge:

Posted Image

So perhaps it's a sponge crab, that has clipped off a piece of barrel sponge and it has grown pretty well onto its back.

Cheers
James
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#15 Leslie

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Posted 23 July 2004 - 07:59 PM

Art's comments plus James' photo of the sponge with zooanthids is the clincher for me: sponge carrying dromid crab it is !
Leslie