I'm always on the lookout for new brachiopods for my collection and this Strophomenid type caught my eye when posted on E-bay. It's from the Ordovician aged rocks near St. Petersburg in Russia. The seller had it identified as "Leptepsia sp." but as I had never heard of that genus I did some digging on Google. What I came up with was a paper written in 1969 by T.N. Alihova. Unfortunately it's mostly written in Russian (cyrillic alphabet) so I can't easily translate it but the names of the genera and species are in the latin alphabet.
The title of the paper is "СТРАТИГРАФИЯ И БРАХИОПОДЫ СРЕДНЕОРДОВИКСКИХ ОТЛОЖЕНИЙ МОСКОВСОЙ СИНЕКЛИЗЫ" which translates roughly (via Google Translate) to "Stratigraphy and Brachiopods of the Ordovician Deposits of the Moscow Syncline".
So, in summary, I believe this is
Leptestia sp. from the Aseri stage, Middle Ordovician, Vilpovitsy Quarry, St Petersburg.
Oh, and there is a cystoid on the piece as well that was labelled as
"Cyclocrinus sp." which I find suspect as well. A little looking around
on the website
Fossiilid.info gave me a possible match in
Hemicosmites sp..
Update 5/14/15 - Thanks to the comments on this post I now believe this to be
Cryptocrinites sp.
Nice! But I don`t see pores on this echinoderm. Maybe it`s Cryptocrinites?
ReplyDeleteCould be... I'll have to look into that some more.
DeleteThis is Cryptocrinites (Eocrinoidea) for sure.
ReplyDeletehttp://books.google.hr/books?hl=ru&lr=&id=yrmgZtjBwvAC&oi=fnd&pg=PA173&dq=Comparative+morphology+of+Rhipidocystis+Jaekel,+1900+and+Cryptocrinites+von+Buch,+1840&ots=6WOngJ43YP&sig=KOiINoLxFNzJpxXvMH0kFrA_VzA&redir_esc=y#v=onepage&q&f=false
Thank you for the reply Nickolay. The link you posted is not available for me but I will keep a look out for the paper you were referencing.
Deletehttps://drive.google.com/file/d/0Bxx1grKgKILHTGNVeHZfNk9sQms/view?usp=sharing
Deletehttps://drive.google.com/file/d/0Bxx1grKgKILHd3JqcUZGTHN5N00/view?usp=sharing
https://drive.google.com/file/d/0Bxx1grKgKILHMWVMWWsxMnBfOXc/view?usp=sharing
Thank you very much Nickolay!
Delete