More Miocene bivalves, sponge(?) and an unknown fossil

[Hapchazzard]

I have received a new batch of fossils from the same locality as my last post. Here's the geologic info:

 

Age: Upper Miocene-Tortonian

Lithology: Sandstone(probably)

General area: Pannonian basin

 

Now, onto the fossils:

 

1) Sponge?

 

 

2) Unknown(possibly bivalve?)

 

 

3) Bivalve(1)

 

 

4) Bivalve(2)

 

 

All help is appreciated. If you need any more info, just ask.

[abyssunder]

Unfortunately, they are only fragments, so I would say, there are no sufficient data for a precise ID.
1 - ?
2 - probably oyster
3, 4 - pectinids

[fifbrindacier]

I agree with Abyssunder.

[doushantuo]

http://www.nhm-wien.ac.at/jart/prj3/nhm/data/uploads/mitarbeiter_dokumente/harzhauser/2003/Mandic_Harzhauser_2003_ANHM.pdf

[doushantuo]

http://www.nhm-wien.ac.at/jart/prj3/nhm/data/uploads/mitarbeiter_dokumente/mandic/Mandic_2004_Grund_Pectinidae.pdf

[Hapchazzard]

Thanks for the info, guys! I've checked out the linked PDFs, and sure enough some of my bivalves closely resemble those in the document.