More Trilobites from Sweden

[Tidgy's Dad]

These are also from the Alum Formation at Raback, Vastergotland, Sweden. Upper Cambrian.

But I have no idea what these ones are.

They're in a very dark grey shale. 

Very small - up to 3 mm wide.

Thank you very much everybody for looking and/ or providing assistance. 

@piranha

 

 

 

[piranha]

Compare the cranidia with pronounced furrows that have similar features with the figures of Ctenopyge and Sphaerophthalmus:

 

Henningsmoen, G. 1957

The Trilobite Family Olenidae with descriptions of Norwegian material and remarks on the olenid and Tremadocian Series.

Skrifter utgitt av Det Norske Videnskaps-Akademi i Oslo. I. Matematisk-Naturvidenskapellg Klasse, 1957(1):1-303  PDF LINK

 

[Tidgy's Dad]

1 hour ago, piranha said:

Compare the cranidia with pronounced furrows that have similar features with the figures of Ctenopyge and Sphaerophthalmus:

 

Henningsmoen, G. 1957

The Trilobite Family Olenidae with descriptions of Norwegian material and remarks on the olenid and Tremadocian Series.

Skrifter utgitt av Det Norske Videnskaps-Akademi i Oslo. I. Matematisk-Naturvidenskapellg Klasse, 1957(1):1-303  PDF LINK

 

Thanks again, Scott. 

Yes, i'd just got to the possibility of Sphaerophthalmus humilis because of the narrower fixed cheeks. 

But now i'll have another look at the paper and see. 

 

Cheers,

Adam. 

[Johannes]

Here is a little more recent publication about Sphaerophthalmus...

 

This and this might be some interesting additional "classics" about their palaeoecology. And, additionally: you have a Phosphatocopina on your third-last picture...

 

 

[doushantuo]

Joe, i have trouble discerning the phosphatocopid.

 

[Tidgy's Dad]

On 5/1/2020 at 11:07 AM, Johannes said:

Here is a little more recent publication about Sphaerophthalmus...

 

This and this might be some interesting additional "classics" about their palaeoecology. And, additionally: you have a Phosphatocopina on your third-last picture...

 

 

Thanks for your help, but your first link only takes me back to my own thread? 

And is the lumpy thing in the middle near the bottom of the photo the Phosphatocopina? I've never heard of them before but I can't match anything up with a cursory look at Google pictures of them? 

Thank you. 

[Tidgy's Dad]

I begin to see.

Doing a lot of rapid reading I can see similarities with  :

or 

(from https://www.researchgate.net/publication/279626316_Morphology_ontogeny_and_phylogeny_of_the_Phosphatocopina_Crustacea_from_the_Upper_Cambrian_Orsten_of_Sweden ) 

 

[Johannes]

@Tidgy's Dad Sorry, I posted a wrong link, this one should be correct.

 

@doushantuo I marked it wit h an arrow in the picture attached:

 

[doushantuo]

Thx Joe.

 

[Johannes]

Usually easy to recognize in the swedish Orsten: black and shiny like fresh asphalt due to their phosphatic shell...

[Tidgy's Dad]

11 hours ago, Johannes said:

@Tidgy's Dad Sorry, I posted a wrong link, this one should be correct. 

 

Yes, thank you. 

I found this yesterday doing my research, and also found this one very useful:

https://paleoarchive.com/literature/Holm&Munthe1901-Kinnekulle.pdf

It's a bit old, being from 1901 and is not in English, but it's not too difficult to locate some of the salient points and it refers directly to not only to the Swedish material but also is specifically about the sites at Kinnekulle and Raback. It particularly refers to Peltura scarabeoides  and Sphaerophthalmus alatus, but I know not to read too much into this as many of the species have been revised or split since this time. 

Thanks again,

Adam.