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Fish and bugs (trilobite) ..not fish and chips


Haravex

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I picked up a few pieces one for prep practice and the second because I like it and have never seen it before. The prep is a Devonian trilobite I think drotops but posting here as there are some real experts on these bugs. The second I am most excited about is a plaqaderm from a boney fish again Devonian period I could only think of dunkleostosus but am sure there are more species than this.

 

Creating a new topic as per troodons advice, hope this is ok.

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Drotops has different tuberculation.  It could be Morocops, further prep to reveal all the lens files will help with a confident ID.

 

image.png.a84de26dad44fb03836a743755df237c.png

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Not sure you could get the placoderm armor down to genus or species. :( 

When it is prepped the plate shape may help, but there are several different placoderms known from Morocco. 

 

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2 hours ago, piranha said:

Drotops has different tuberculation.  It could be Morocops, further prep to reveal all the lens files will help with a confident ID.

 

 

Which areas are you seeing different? I was wondering about the plurae but I found example of the Drotops with them there as well. 

Jay A. Wollin

Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve

Hamburg, New York, USA

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18 minutes ago, DevonianDigger said:

Which areas are you seeing different? I was wondering about the plurae but I found example of the Drotops with them there as well. 

 

 

Drotops megalomanicus should have larger tubercles.  Also, Drotops has fewer tubercles on the axial lobe and pleurae.  

Although the OP did not include any scale, I imagine it is considerably smaller than a typical large Drotops at 10-15 cm.

 

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Oh wow, seeing the two side-by-side really makes a difference. The axial rings are much broader on his example. The pleural furrows are also much more sharply defined in the Drotops. I was using the tubercles on the plurae and the tubercles in the post-occipital field as diagnostic. I swear, @piranha, one of these days I'm going to be right about one of these IDs. I'm surprised at this point that I haven't been chastised this month for so many "close, but not quite" IDs. ...I'll show myself out :P Sorry, @Haravex for the misleading post.

Jay A. Wollin

Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve

Hamburg, New York, USA

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The tubercles on the glabella are also diagnostic, but don't compare the broader axial lobe. 

Remember, the photos are not oriented to scale.  The Drotops is approximately 2-3x larger.

With regard to the actual size difference, here is a more accurate side by side comparison:

 

IMG1.png.184f5af35f1fa03561f1f00e807a6af4.png

 

image.png.a84de26dad44fb03836a743755df237c.png

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As @piranha says, the number of tubercles seems too small and distributed to be a Drotops.  There is little doubt that this is a phacopid, though. More information on this piece would help.

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5 hours ago, piranha said:

Drotops has different tuberculation.  It could be Morocops, further prep to reveal all the lens files will help with a confident ID.

 

Pardon the annoying question, but what are considered to be the tubercles?

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19 minutes ago, Malone said:

Pardon the annoying question, but what are considered to be the tubercles?

 

Tubercles are protuberances (raised knob-like projections on the exoskeleton).

 

1 hour ago, Kane said:

...More information on this piece would help.

 

Or a well prepped eye... emo71.gif eyepopping.gif

image.png.a84de26dad44fb03836a743755df237c.png

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For prep over here in morocco I only have with me the engraver so don't really want to carry on delicate work until I get home to scribe and air eraser, the place I bought these two from was tadaout south west of merzouga and north west of taouz it is a small mining community mainly minerals but also crinoid plates, trilobite gonanite and that beautiful fish plaque a friend of mine over here loves minerals so said he would take me for a tour as he was going collected some nice minerals too and seen a very large 3d eroded but of.beautiful quality orthoceras which is on the road literally on the way there hidden by dirt. Sorry I can't give more information

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Due to the number of tubercles on so much of the body and the size, i think Morocops is a good starting point, though as has been said, the cephalon and eye detail would be most helpful. 

https://www.researchgate.net/publication/312917851_The_phacopine_trilobite_genera_Morocops_Basse_2006_and_Adrisiops_gen_Nov_from_the_Devonian_of_Morocco

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  • 5 weeks later...

This is all I could get sadly the trilobite was only partial and next to a partial head and either in the rock a few fragments of another. Also having a hard time removing all the matrix with the air eraser the bi-carb worked well for most of it but some pieces are stuck and just won't budge turned the psi up to 60 and still no go so I left it would I need to use another type of media to remove the remaining? As dolomite I cannot seem to find or get here in the UK.

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