Brachiopods and a Gastropod for ID

[minnbuckeye]

I was just labeling and filing some summer finds from the Solon member/ Cedar Valley Formation/ Devonian of central Iowa. These 4 items have me a little confused, so I am reaching out for knowledge! 

1.

 . 

 

 2. 

 

 3.

  

4.

[Tidgy's Dad]

Number one looks like a chonetid, maybe Devonochontes calvini, but I think is actually more likely Strophodonta subdemissa. (not a chonetid)  

2. Dunno.

3. Could be Seratrypa rustica ? 

4. Meristella parva.

 

Not altogether familiar with the formation, so don't take my word for it! 

[Fossildude19]

3 may actually be Atrypa independensis,

See this pdf - page 125 - plate IX

[Tidgy's Dad]

2 hours ago, Fossildude19 said:

3 may actually be Atrypa independensis,

See this pdf - page 125 - plate IX

This is the most common species there, apparently. 

Though I think it is now Desquamatia (Independatrypa) independensis. 

And Seratrypa is likewise Desquamatia (Seratrypa) 

See app43-155.pdf (pan.pl)

 

To me, it doesn't look inflated enough for the Independatrypa variety, but that may be the photos. 

 

Still, it would seem Desquamatia is likely either way. 

Edited October 17, 2021 by Tidgy's Dad

[minnbuckeye]

Desquamatia  or Independatrypa independensis IS very common. probably 10 to 1 ratio to all other brachiopods in the matrix I examined. The brachiopod in #3 has little doming  and only barely a hint of a sulcus. The ribbing is much finer than the "I. independensis"  finds. That is why I scratch my head!! Thanks for everyones thoughts!!

[Tidgy's Dad]

1 hour ago, minnbuckeye said:

Desquamatia  or Independatrypa independensis IS very common. probably 10 to 1 ratio to all other brachiopods in the matrix I examined. The brachiopod in #3 has little doming  and only barely a hint of a sulcus. The ribbing is much finer than the "I. independensis"  finds. 

This is why I think Desquamatia (Seratrypa) is a possibility. 

[doushantuo]

I've found the following to be useful,atrypid-taxonomically speaking

[doushantuo]

some of you may like:

app43-155.pdf

 

which SHOULD be in the Joe Gallo library

Edited October 18, 2021 by doushantuo

[doushantuo]

some of you may like:

The Chonetoidean Brachiopods. A revised and updated systematic and bibliographic catalogue
Patrick R. Racheboeuf

Documents des Laboratoires de Géologie, Lyon

recommended,but no specimens are figured

buckracheboeubrachiochonetigeoly_0750-6635_1998_minnbuckemon_148_1_1793.pdf

 

edit: a PART of the glossary of term

 

Edited October 18, 2021 by doushantuo