Doubts on Devonian Phacopids

[mediterranic]

Hello,

I think these are a Cornuproetus plus a Reedops? Am I right?

They are from Atchana. 

 

If yes, are the species known?

 

Thanks in advance to you all. 

 

Miguel

[ynot]

Can not help with ID's on these, but WOW that is a nice plate!

[mediterranic]

@ynot 

[piranha]

Lepidoproetus maharchianus

 

Reedops cephalotes hamlagdadianus

[mediterranic]

Well, the second one I was almost sure. I had already some of them in association with Crotalocephalus, from that same quarry. Now the Lepidoproetus , as usual, you caught me by surprise.

 

Thanks a lot, @piranha  

[mediterranic]

Hello. Good afternoon to all.

 

Is this a Phacops, a Reedops, a somethingops from the newly organized/described taxa of Moroccan Phacops-like? Some years ago I would call it Reedops. sp.

 

Btw, what papers to consult about all these?

 

Thanks in advance,

 

Cheers, Miguel

[piranha]

It could be Reedops bronni or Reedops pembertoni.  Use the lens diagrams to determine the best match.

 

 

McKellar, R.C., & Chatterton, B.D.E. (2009)
Early and Middle Devonian Phacopidae (Trilobita) of southern Morocco.
Palaeontographica Canadiana, 28:1-110

[mediterranic]

13 minutes ago, piranha said:

It could be Reedops bronnior Reedops pembertoni.  Use the lens diagrams to determine the best match.

 

 

Ok, done. Perfect match with R. bronni. Thanks a lot, @piranha

[mediterranic]

Hi guys.

I am with serious doubts on this one's ID. Thanks in advance if someone can helpson it.

 

Miguel

[piranha]

Phacops araw is a good match.

 

[mediterranic]

27 minutes ago, piranha said:

Phacopsaraw is a good match.

Yes, it is, indeed. Now I see (by the lens formula) why it seems that the ocella look like a triangular shape towards the anterior part. 

Thanks, once again, @piranha

 

P.S.: where is it described?

[piranha]

13 minutes ago, mediterranic said:

P.S.: where is it described?

 

 

McKellar, R.C., & Chatterton, B.D.E. (2009)
Early and Middle Devonian Phacopidae (Trilobita) of southern Morocco.
Palaeontographica Canadiana, 28:1-110

[mediterranic]

Thank you @piranha

[mediterranic]

20 hours ago, piranha said:

Phacopsaraw is a good match.

Yes, it is, indeed. Now I see (by the lens formula) why it seems that the ocella look like a triangular shape towards the anterior part. 

Thanks, once again, @piranha

 

P.S.: where is it described?

sorry, but to continue writing, it forced me to submit the previous reply

sorry, but it forced me to re-submit the previous reply to continue wrinting

[mediterranic]

...

sorry but it forced me to re-submit the previous reply to continue writing

[mediterranic]

I "saved" this one from being part of a necklace. It has already a hole in the cephalum. 

Is it a Reedops or a Barrandeops?

 

Thanks in advance,

Miguel

Those two didn't had the same luck. They are already in necklaces:

 

1- 

[mediterranic]

2- it doesn't allow to upload the second

now:

probably they all are at McKellar, R.C., & Chatterton, B.D.E. (2009), right? @piranha

[piranha]

1 hour ago, mediterranic said:

Is it a Reedops or a Barrandeops? ...probably they all are at McKellar, R.C., & Chatterton, B.D.E. (2009), right?

 

 

These are Reedops cephalotes hamlagdadianus. 

McKellar & Chatterton 2009 Barrandeops (recently reclassified as Morocops) has significantly fewer eye lenses.

 

Viersen, A.P. Van, Holland, D., & Koppka, J. (2017)

The phacopine trilobite genera Morocops Basse, 2006 and Adrisiops gen. nov. from the Devonian of Morocco.

Czech Geological Survey, Bulletin of Geosciences, 92(1):13-30    PDF LINK

 

 

This one has fewer lenses, compare with the lens diagrams for: Reedops bronni or Reedops pembertoni

 

  

[mediterranic]

thanks, @piranha

is McKellar, R.C., & Chatterton, B.D.E. (2009) available? To try not to ask for each ID on each Phacopid.

 

Thanks in advance,

Miguel

[piranha]

7 hours ago, mediterranic said:

thanks, @piranha

is McKellar, R.C., & Chatterton, B.D.E. (2009) available? To try not to ask for each ID on each Phacopid.

 

Thanks in advance,

Miguel

 

 

PM sent

[mediterranic]

Good morning everybody.

Is Struve (1995), with the 4 forma of Drotops armatus described, available?

 

Thanks in advance to everybody that can helps,

Miguel Pais

[doushantuo]

I have that (physical)issue of SL.

Edit: I think

"Riesen-Phacopiden",etc?

[piranha]

6 hours ago, mediterranic said:

Good morning everybody.

Is Struve (1995), with the 4 forma of Drotops armatus described, available?

 

Thanks in advance to everybody that can helps,

Miguel Pais

 

 

Struve, W. (1995)

Die Riesen-Phacopiden aus dem Ma'ider, SE-marokkanische Prä-Sahara.

Senckenbergiana lethaea, 75:77-129

 

 

As usual, check your email   

[mediterranic]

Good morning everybody.

Thanks again, as usual, @piranha

Miguel

[mediterranic]

Well, Mr. Wolfgang Struve didn't have good specimens available when he published the famous paper.

It is almost impossible to be sure how to separate the 4 different forma of Drotops armatus.

Any updated information or ideas if the individual variation of this species is clear enough to classify different forms (or subspecies)?

Below is presented the study case that I would like to clarify by now.

 

Thanks in advance for all contributions.

Miguel