ABSTRACT
The fauna contains 35 taxa, 16 of them new. The Cyrtocrinida are represented by 14 species, 6 of them new (2 species are based on brachials). 17 forms are classified with the Millericrinida, 9 of them new (5 species are based on brachials). The Comatulida are represented by two species, including a new species of Paracomatula. The Isocrinida include a single cirral of Pentacrinites and a large number of columnals, cup plates and brachials of a species of Balanocrinus. Non-crinoid echinoderms are rare; they include ossicles of asteroids, ophiuroids (vertebrae and lateral shields) and fragmented echinoid spines. Non-echinoderms are even rarer. The crinoid fauna of Arzo shares some species with other Lower Jurassic Tethyan faunas but almost completely lacks pseudoplanktonic forms (Pentacrinitidae). The relationship with Pliensbachian – Toarcian faunas from northern and western Europe is less close.
