A nautiloid from Middle Eocene beds at Grdoselo in Istria, Croatia

Abstract

V prispevku so obravnavani ostanki kamenega jedra fragmokona eocenskega navtilida vrste Aturia cf. ziczac (Sowerby, 1812) iz Grdosela v osrednji Istri. Aturijini ostanki so iz horizonta apnen~evih pe{~enjakov megasekvence pazinskega fli{nega bazena. V teh plasteh je veliko morskih ježkov rodov Echinolampas in Cyclaster, veliko manj je primerkov rodov Macropneustes in Conoclypus. Od mehkužcev so praviloma najdena samo njihova kamena jedra. Relativno majhna diverziteta morskih ježkov, veliko {tevilo posameznih vrst in popolna odsotnost koral, do neke mere kažejo na to, da so v tem najdi{~u ostanki organizmov najverjetneje ostali blizu njihovega nekdanjega življenjskega prostora in nimajo alohtonega predznaka.

A new cephalopod find in the Eocene beds near Grdoselo in Istria, Croatia

“…The cast fossil of the nautilid species Aturia cf. ziczac (Sowbery, 1812) (Mikuž 2009) has also been found in the same locality. The nautilid phragmocone presented here (Pl.…”

“…After its excavation we realised that this was a relatively well preserved cast fossil of a cephalopod (Fig. 2), which was not similar to the Aturia specimen found a few years earlier and described in Mikuž (2009). Well preserved nautilid fossils are rare in the Eocene of Istria.…”

“…Almost a century later several researchers mention or present individual nautilid finds in the Istrian peninsula: (1864a; 1864b; 1889), Parona (1898), ScHuBert (1905), Manek (1905Manek ( ), toniolo (1909Manek ( ), toula (1918, Sacco (1924), Šiki} (1963), Pol{ak & Šiki} (1973), aBate et al (1988), tarlao, tuniS & Venturini (1995, MooSleitner (1996), Mik{a, Mezga & ^oSoVi} (2005) and Mikuž (2009), the latter includes a survey of older data and some new findings concerning the species Aturia cf. (Sowerby), all found in proximity of Grdoselo.…”