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Giant belemnite arm hook Megaonychites


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Megaonychites, form genus for the giant hooks that some belemnites have been shown to carry as a pair.

By analogy with modern coleoids, they were probably carried by the males and used as mating claspers.

This is a fairly large one at 3.4cm (the range is 0.5cm to about 4cm).  It most likely belonged to a large Acrocoelites trisulculosus, by far the most common belemnite in these beds.

 

Very rare in the UK but more frequent in the equivalent Holzmaden Posidonienschiefer.

I've only seen one other from here - a partial - and that was mine until I gave it away thinking at the time it was a fish bone. (It was a long time ago... :) ).

 

A recent acquisition from the usual auction site. (Found by a knowledgeable friend so the stratigraphy is good.)

 

Mulgrave Formation ("Jet Rock"), Toarcian Stage, Lower Jurassic, near Whitby, Yorkshire, UK.

 

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  • I found this Informative 6
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Simply awesome,both the specimen and the documentation

Thx

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Looks like a deadly scythe....I would never guess in a million years it was part of a squid :P 

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Very interesting. Great find:dinothumb:

36 minutes ago, TqB said:

gave it away thinking at the time it was a fish bone. (It was a long time ago... :) ).

We’ve all had those moments. I left a weird looking black thing in a Silurian rock a year ago, only to learn it was a Rare shark tooth four months later:doh!:

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Nice acquisition!

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Thanks, all! @doushantuo - Huxley was famously taken in by an arm crown from one of those (or similar) that someone had cobbled onto a belemnite rostrum. Of course, Holzmaden has the real thing with Passaloteuthis and Acrocoelites as well as other coleoids. Sadly, no belemnite arms are known from Yorkshire yet...

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Tidgy's Dad

Tarquin! 

That is gorgeous! :wub:

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fossilized6s

Simply awesome piece! Thanks for sharing this and teach all of us a little something. 

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8 hours ago, Tidgy's Dad said:

Tarquin! 

That is gorgeous! :wub:

Thanks, Adam, a photogenic little thing. :)

 

4 hours ago, fossilized6s said:

Simply awesome piece! Thanks for sharing this and teach all of us a little something. 

Thank you! I'm sure there'll be some in collections identified as fish bones.

 

2 minutes ago, Bobby Rico said:

Fantastic. Wonderful specimen.:wub:

Thanks, Bobby - very pleased to have had the chance to acquire it. It goes in the special belemnite drawer. :)

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Oh wow the preservation is awesome:wub::wub:

Congrats!

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12 hours ago, belemniten said:

Oh wow the preservation is awesome:wub::wub:

Congrats!

Thanks, Sebastian! You might be able to find these around Holzmaden... 

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