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Crab's Fever

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WoW awesome claw, I hope the rest is there. Did you find many more concretions?

 

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On 29/12/2016 at 9:39 PM, Doctor Mud said:

Being my first trip it took me a while to get my eye in for the right concretions.

 

The most interesting find was this:

 

image.jpeg

 

My my guess is that this is a pincer from Metacarcinus novaezelaniae 

(Piecrust crab).

 

Surely you are right, ;)

nice find :)

 

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On 30 December 2016 at 1:49 PM, fossisle said:

WoW awesome claw, I hope the rest is there. Did you find many more concretions?

 

I hope so too. I decided to save this one for the scribe and not crack it. 

 

It it was my first time there. I found concretions, but no crabs. Plenty of shells and bits of unidentifiable marine mammal bone, but for some reason I missed out on the crab front. I think I was cracking the right concretions?

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1 hour ago, MB said:

Surely you are right, ;)

nice find :)

 

Thanks MB.

 

Im hopeful the rest of the crab is in there.

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5 hours ago, Doctor Mud said:

I hope so too. I decided to save this one for the scribe and not crack it. 

 

It it was my first time there. I found concretions, but no crabs. Plenty of shells and bits of unidentifiable marine mammal bone, but for some reason I missed out on the crab front. I think I was cracking the right concretions?

Always fun to go somewhere new. You were probably finding what other people would leave hoping for a crab, but some of that can be just as interesting!!

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6 hours ago, fossisle said:

Always fun to go somewhere new. You were probably finding what other people would leave hoping for a crab, but some of that can be just as interesting!!

I agree.

Often great stuff is missed because people at famous crabbing sites are looking for crabs. They have their search image honed in for these.

 

The local museum said they had found some of their best vertebrate remains near  the car park. 

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On 12/30/2016 at 9:39 AM, Doctor Mud said:

Being my first trip it took me a while to get my eye in for the right concretions.

 

The most interesting find was this:

 

image.jpeg

 

My my guess is that this is a pincer from Metacarcinus novaezelaniae 

(Piecrust crab).

 

i am afraid i think what you have is better than a Metacarcinus novaezelaniae

Metacarcinus novaezelandiae.jpg

 

what i can see is the head plate of a metanephrops motunauesis

metanephrops motunauesis.jpg

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Small hermit crabs in an olivella sp from san marguarita formation, CA. I did not find it by myself on the field. I received it from my secret santa. 

Do not know the genus nor the species.

 

20170104_183614.jpg

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Man-o-man,,, some cool stuff you folks are finding!!!

 

RB

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On 4/1/2017 at 10:44 AM, David in Japan said:

Small hermit crabs in an olivella sp from san marguarita formation, CA. I did not find it by myself on the field. I received it from my secret santa. 

Do not know the genus nor the species.

 

20170104_183614.jpg

Wow... interesting !

:)

 

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I do not know if I showed you one of my latest additions to my collection? Unfortunately it was a personal purchase, a small whim, since this species I did not yet have:  Torynomma quadrata Woods, 1853

 

:)

Torynomma quadrata 548.1.1. petit..jpg

Torynomma quadrata 548.1.2. petit..jpg

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On ‎4‎/‎01‎/‎2017 at 6:12 PM, Dave (POM) Allen said:

i am afraid i think what you have is better than a Metacarcinus novaezelaniae

Metacarcinus novaezelandiae.jpg

 

what i can see is the head plate of a metanephrops motunauesis

metanephrops motunauesis.jpg

Hi Dave,

 

Thanks for sharing these amazing specimens. That is a monster Metacarcinus!

 

Funny you should mention the possibility of this being a Metanephrops lobster. I was tossing up between this and the underside (ventral) surface of a Metacarcinus pincer.

 

It might not be clear from my original (taken on the Iphone) shot but the reason I went for the Metacarcinus pincer is the presence parallel ridges parallel to the long axis.

 

Here's a clearer shot of the specimen comparing it to the ventral surface of a Metacarcinus specimen from MB's Fossil crab webpage.

 

Motunau specimen 2017.jpg

 

 1. Metacarcinus from MB's Fossil crab website

 2. Original photo of my specimen

 3. Cropped, rotated and enhanced image rotated to compare to MB's specimen.

 

For comparison, here's a reconstruction of the carapace of Metanephrops motunauensis from Jenkins (1972):

I can't see any similar structures. I hope to get this specimen CT scanned before prep. so lets see what happens

 

 

Metanephrops Jenkins 1972.jpg

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Here is a copy of the Jenkins paper on Metanephrops motunauensis:

 

Jenkins 1972 Metanephrops.pdf

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1 hour ago, MB said:

I do not know if I showed you one of my last additions to my collection? Unfortunately it was a personal purchase, a small whim, since this species I did not yet have:  Torynomma quadrata Woods, 1853

 

:)

Torynomma quadrata 548.1.1. petit..jpg

Torynomma quadrata 548.1.2. petit..jpg

Wow, it's not easy to get these

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23 hours ago, Doctor Mud said:

Here is a copy of the Jenkins paper on Metanephrops motunauensis:

 

Jenkins 1972 Metanephrops.pdf

thanks and i thought i was on the money.

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You're completely right, Dr. Mud ;)

The almost parallel ridges or keels in the outer surface of the palm, are typical and sometimes diagnostic character for the cancroid and cancrid crabs.

:)

 

 

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