Need help identifying the following fossil. Found this fragment in the limestone in the locality Theokafta of the Argolis Peninsula, near the Ancient Theatre of Epidaurus (Greece, eastern Peloponnesus). The limestone contains condensed ammonoid beds of the Hallstatt facies (Triassic: Anisian–Ladinian). The size of the fragment is about 1,5 cm. Any suggestion would be much appreciated!