Oleksandr Kovalchuk

7 Questions 28 Answers 0 Followers

Questions related from Oleksandr Kovalchuk

Which gobiid fish was this?

Here is one fossil fish bone from the middle Sarmatian of Eastern Europe. I suggest that it belonged to a gobiid fish. Is it true or not? If yes, which genus and species it was?

04 November 2015 6,473 1 View

Does anybody have photos of the opercuar bones of Hucho hucho and/or Hucho taimen?

Dear all, I will be very grateful for sending photos or images, illustrating opercular bones of Hucho hucho and Hucho taimen. Maybe, these images were presented elsewhere in publications?

17 April 2015 4,224 3 View

How many valid extinct species of pikes been described till now?

Now I'm working on with fossil fish remains of the genus Esox (Esocidae) from the heterochronous strata of Southeastern Europe in the range of Late Miocene - Pleistocene. Infomation about the...

13 April 2015 2,809 3 View

Can you help me with measurements of isolated pharyngeal teeth of the Scardinius genus?

Can you help me with pharyngeal tooth measurements of representatives of the Scardinius genus (S. acarnanicus, S. graecus, S. dergle, S. knezevici, S. plotizza, S. racovitzai, S. scardafa, and S....

14 May 2014 544 3 View

Can you help with comments on the methodology of DNA extraction in bony fishes and preparation of samples?

I want to study the formation process of freshwater icthyofauna on the south of Eastern Europe during the Late Cenozoic. First of all, I want to learn how it is possible to extract DNA of extant...

11 May 2014 833 2 View

What stratigraphic range does Barbus (Bertinius) vindobonensis have and when did Barbus (Bertinius) disappear?

There are many isolated pharyngeal teeth of Barbus in the Late Miocene of Ukraine (in a stratigraphic range from MN 10 to MN13). Some of these teeth are Barbus (Luciobarbus), but the majority of...

09 April 2014 1,800 0 View

Rodent tooth marks on turtle shell

We're working on the description of turtle shell fragments from the late Miocene of Ukraine. There are some unusual traces (shallow parallel grooves) on the dorsal surface of one of the specimen....

01 January 1970 1,282 9 View