NEW INSIGHTS ON THE SHELL-CRUSHER SHARK PTYCHODUS DECURRENS AGASSIZ, 1838 (ELASMOBRANCHII, PTYCHODONTIDAE) BASED ON THE FIRST KNOWN ARTICULATED DENTITION FROM THE UPPER CRETACEOUS OF CROATIA

New insights on the shell-crusher shark Ptychodus decurrens Agassiz, 1838 (Elasmobranchii, Ptychodontidae) based on the first known articulated dentition from the Upper Cretaceous of Croatia

Abstract A new lower tooth plate of Ptychodus decurrens from the Turonian (Upper Cretaceous) of the Dalmatian region (southern Croatia) is documented here for the first time.The specimen represents the first articulated dentition of a ptychodontid shark that has been discovered from the Balkan Peninsula and the most complete ever found for the un-c

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Systematic analysis of head-to-head gene organization: evolutionary conservation and potential biological relevance.

Several "head-to-head" (or "bidirectional") gene pairs have been studied in individual experiments, but genome-wide analysis of this gene organization, especially in terms of transcriptional correlation and functional association, is still insufficient.We conducted a systematic investigation of head-to-head gene organization focusing on structural

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Liberalism, Liberal Egalitarianism or Communitarianism?

Three philosophies have different proposals and pathways in the ethical field of the study and the solution of problems relating to justice: liberalism, liberal egalitarianism and communitarianism.His representatives are called respectively liberal, liberal-egalitarian and communitarian.In this paper, we intend to evaluate each of these philosophic

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