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andyrice11

The Mysterious Cheirurus

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andyrice11

The fossil(s) in question here were collected during the summer of 2016 from the Liston Creek Limestone (Silurian) in northern Indiana. I am using them for my senior thesis project in which I'll be comparing Ordovician trilobites with Silurian Trilobites. Anyways, I have been taking a scientific illustration class during the month of May and for my final project I decided to do a stippled illustration of one of the Cheirurus cephalons I collected in 2016 (in total i have about 7 cephalons of varying sizes, all with identical morphological characteristics). I've been trying to narrow this particular specimen down to the species level since I plan include the binomial nomenclature on my final illustration. After a days worth of researching I'm still unable to confidently identify the specimen at the species level. The literature I have on the rock formation this specimen comes from lists Cheirurus niagarensis among the common fauna. From what I've seen online, I don't think my specimen is C. niagarensis. Two other possibilities I've noted are; C. infensus, and C. insignis... So far those are the only 3 Cheirurus species that resemble my specimen the closest, but I'm still not confident in any one of them in particular. As fossil ID information is notoriously hard to find on the internet I've decided to post some pics of my specimen on here to see if anyone can help me to ID it.

 

The first 5 pics are of the specimen I'm using for my illustration. The 6th picture is of the previously mentioned specimen (right) and a larger specimen (left). 

 

 

20170523_011843.jpg

20170523_011900.jpg

20170523_011928.jpg

20170523_011942.jpg

20170523_012051.jpg

Resized_20160823_002001[1].jpg

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doushantuo

would the Lane thesis be helpful?

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andyrice11
17 minutes ago, doushantuo said:

would the Lane thesis be helpful?

 

I'm not sure exactly what you mean by that?

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doushantuo

well,it's old,and on cheirurids:D

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andyrice11
Just now, doushantuo said:

well,it's old,and on cheirurids:D

I'm still a bit confused haha! 

What exactly is the "lane thesis" you mentioned?

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doushantuo

ensisad.jpg

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andyrice11
5 minutes ago, doushantuo said:

Awesome!! :) Do you happen to have a link to the full report? 

 

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doushantuo

lane

 

edit:

sorry

lane2

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andyrice11
Just now, doushantuo said:

Thank you so much!!! :):)

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doushantuo

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doushantuo

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andyrice11
4 minutes ago, doushantuo said:

 

4 minutes ago, doushantuo said:

 

All 3 of these seem like some wonderful resources! I will be sure to bookmark them right away! 

Thank you so much for the help! :) 

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andyrice11
26 minutes ago, doushantuo said:

lane

 

edit:

sorry

lane2

 

So after looking through the plates at the end of this document I would say that the new leading contender for my specimen ID is Bartoninus elongatus (Plate 9). This is of course based solely on morphological similarities.. I have yet to read what the document has to say about this particular species.

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doushantuo

whbioarvi.jpg

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doushantuo

not Ceraurinella?B)

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doushantuo

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andyrice11
4 minutes ago, doushantuo said:

not Ceraurinella?B)

I would say that is a very strong possibility as well! 

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andyrice11
8 minutes ago, doushantuo said:

not Ceraurinella?B)

Does Ceraurinella = Bartoninus ?

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doushantuo

yep,think so

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andyrice11
Just now, doushantuo said:

yep,think so

cool! oh the joys of old nomenclature!

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doushantuo

I always check for revision.

Somwhere down the line Piranha will have a say in this.

He's way more knowledgable about trilobites than I am

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doushantuo

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andyrice11
7 minutes ago, doushantuo said:

I always check for revision.

Somwhere down the line Piranha will have a say in this.

He's way more knowledgable about trilobites than I am

You seem pretty knowledgeable yourself! I appreciate all the tremendous links you've shared :)

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doushantuo

mwah,compared to Piranha(and maybe some others) I'm small fry,peanuts really.

The guy is amazing when it comes to trilobitology .

Trilobitewise,I'm more into  paleo-ecology*/taphonomy,biogeography than systematics 

If it has to be systematics,than preferably incorporating advanced methods 

*as an example

wiment.pdf

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andyrice11

Well hopefully he comes across this post then haha!

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