Trilobites of the United States from my Paleo Archives Collection

[Olenellus]

Trilobites of the United States from my Paleo Archives Collection (Refer to Attached File)

(1) Olenellus clarki and Olenellus fremonti (Early Cambrian), Marble Mts, California

(2) Elathria kingii (Middle Cambrian) from Wheeler Amphitheater, Utah

(3) Phacops rana milleri (Middle Devonian) of Sylvania Fossil Beds, Ohio

(4) Ameura missouriensis (Upper Pennsylvanian), Jemez Springs, New Mexico

[Kane]

Just a helpful revision for the labels: Phacops rana milleri = Eldredgeops rana milleri. All trilobites of the Phacops genus in North America were reclassified.

 

As an added bonus to the specimen you pictured here, E. rana milleri became the type species for the reassigned genus in the work of Struve:

 

Struve, W. (1990). Paläozoologie III (1986–1990). Courier Forschung- sinstitut Senckenberg 127:251-279

[Tidgy's Dad]

Very nice.

Species names shouldn't be capitalized, so Olenellus clarki, for example, not Olenellus Clarki. 

[Fossildude19]

I've made the necessary edits.    

[Brett Breakin' Rocks]

5 hours ago, Olenellus said:

Olenellus clarki and Olenellus fremonti (Early Cambrian), Marble Mts, California

My understanding is that  the genus Olenellus has been changed to Mesonacis (aka. Mesonacis fremonti).. @Kane have you heard this ?  I saw it updated on the Trilobites of the Marble mountains page. A  great resource BTW. 

 

http://inyo.coffeecup.com/site/latham/latham.html

 

Cheers,

Brett

 

 

[Tidgy's Dad]

1 hour ago, Brett Breakin' Rocks said:

My understanding is that  the genus Olenellus has been changed to Mesonacis (aka. Mesonacis fremonti).. @Kane have you heard this ?  I saw it updated on the Trilobites of the Marble mountains page. A  great resource BTW. 

 

http://inyo.coffeecup.com/site/latham/latham.html

 

Cheers,

Brett

 

 

I think you are correct about this species, but ,as I understand it, Olenellus was a bucket taxon and while many species within it have been assigned to other / new genera, the genus itself is still valid and contains several species. 

I believe Olenellus clarki is still correct, but I am probably wrong.

@piranha 

[Brett Breakin' Rocks]

8 minutes ago, Tidgy's Dad said:

I believe Olenellus clarki is still correct, but I am probably wrong.

Oh yes, my apologies ..   fremonti (Mesonacis fremonti) was the only one I was aware of had been placed in a new genus ?  I just wasn't sure how many had shuffled.

 

Thanks Adam !

 

Cheers,

Brett

[piranha]

Olenellus is still a valid genus.  Olenellus fremonti Walcott 1910 was reclassified Mesonacis fremonti by Resser 1928.  It was later reclassified "Fremontia" by Raw 1936, and many authors have applied each of these various names over the years.  "Olenellus fremonti" and "Fremontia fremonti" are synonyms of Mesonacis fremonti. 

 

Lieberman, B.S. 1999

Systematic Revision of the Olenelloidea (Trilobita, Cambrian).

Peabody Museum of Natural History, Yale University Bulletin, 45:1-150  PDF LINK

[Sjfriend]

Nice pieces.

 

I just did a little digging in the Marble Mountains. Will have a trip post in a bit. Just have to get stuff figured out.