Trilobite of Russia

Beautiful specimen. And, you're right, they are not common! A fantastic addition.  

Thank you Kane. I love the russians, they're so cute and well preserved (the trilobites of course).

This one has a little suffered but it is still good. I also have an Asaphus Robustus from the lava river.

When i saw this chasmops on the site of my favorite trilobite seller, i booked it and asked him to bring it to the exposition of Pau in April.

Here is a (pro)chasmops shown in a french forum dedicated to the trilobites :

This is a very nice trilobite!  

However, may I ask why you spell the genus (Pro)chasmps?  Putting part of the name in brackets is not any part of proper taxonomic nomenclature.

Don

I posted one back in 2011 and mentioned possible problems with the name.  At that time the name Prochasmops had only occurred in the "grey" literature.  As of 2018 it has only been listed in a total of 6 publications.  Klikushin et al. 2009 established the new genus and Krueger 2013 has elaborated further on this proposal.  The most recent paper, Schöning 2017 has reported: ?Prochasmops sp.

Klikushin, V., Evdokimov, A., & Pilipyuk, A. 2009
Ordovician Trilobites of the St. Petersburg Region, Russia.
Saint-Petersburg Paleontological Laboratory, Griffon Enterprises Inc., Master Fossil Japan, 541 pp.

Krueger, H.H. 2013

Die Unterfamilie Chasmopinae (Trilobita, Pterygometopidae) aus baltoskandischen Geschieben sowie Baltoskandia und angrenzenden Gebieten. Ampyx-Verlag, 150 pp.

Krueger, H.H. 2017
Die Trilobitengattungen Estoniops MÄNNIL und Achatella DELO (Trilobita: Phacopida, Pterygometopidae) aus ordovizischen baltoskandischen Geschieben. Ampyx-Verlag, 44 pp.

Lawrence, P., & Stammers, S. 2014
Trilobites of the World: An Atlas of 1000 photographs.

Siri Scientific Press, 416 pp.

Levi-Setti, R. 2014
The Trilobite Book: A Visual Journey.

University of Chicago Press, 273 pp.

Schöning, H. 2017
Trilobiten aus Geschieben des Kies-Sand-Rückens in der Laerheide (Landkreis Osnabrück) – II. Ordovizische Trilobiten.
[Trilobites from rubble of the gravel-sand ridge in the Laerheide (Osnabrück district) - II. Ordovician trilobites.]
Osnabrücker Naturwissenschaftliche Mitteilungen, 42/43:29-80

18 hours ago, FossilDAWG said:

This is a very nice trilobite!  

However, may I ask why you spell the genus (Pro)chasmps?  Putting part of the name in brackets is not any part of proper taxonomic nomenclature.

 

Don

Because the name Prochasmops is in question as say @piranha. In the french forum, it is listed as Chasmops praecurrens.

Interesting problem in nomenclature.  In this case the species has historically been assigned to Chasmops, but recently a new genus Prochasmops has been proposed but is not widely accepted.  The rules governing taxonomic names are quite precise.  Brackets can be used to indicate a subgenus, or when placed around the name of the person who described the species it indicates that the species was originally associated with a different genus.  They are not used to split up a name into accepted/questionable parts, nor should they be used to indicate old names that are no longer used, as you see too often in Forum posts.  The better option would be to pick one genus name (either Chasmops or Prochasmops, or even ?Prochasmops as piranha did) and then explain the controversy in the "more info" section.

Don

By the way, the reason I care about this is that recently I have noticed that when I google names of fossil species, images from the Fossil Forum (including from Collections) are often at or near the top of the list of recovered links.  That means that we should be extra careful to name things properly, because that information is being passed on to the entire internet.

Don

11 minutes ago, FossilDAWG said:

By the way, the reason I care about this is that recently I have noticed that when I google names of fossil species, images from the Fossil Forum (including from Collections) are often at or near the top of the list of recovered links.  That means that we should be extra careful to name things properly, because that information is being passed on to the entire internet.

 

Don

We are, essentially, publishers practicing the process of scientific accuracy.