Perturbatacrustaleini n. gen., n. sp. a new microencruster incertae sedis (? sponge) from Late Jurassic to earliest Cretaceous platform margin carbonates of the Northern Calcareous Alps of Austria

摘要: A new microencruster of unknown systematic position is described as Perturbatacrustaleini n. gen., sp. from the Late Jurassic Plassen Carbonate Platform Northern Calcareous Alps and its resediments (p.p. Barmstein Limestone). The labyrinthic interior canal system marginal openings reveal a possible sponge origin. Differences affinities to allied taxa such Radiomura cautica Senowbari-Daryan Schafer are discussed. biostratigraphic range known so far Kimmeridgian Tithonian (?Early Berriasian) reported Austria, Bulgaria, Romania, Greece. was detected in boundstones with diverse association microencrusters mainly encrusting sponges occurring together microbial crusts. Together other organisms reef builders, Perturbatacrusta leini played an important role for carbonate production stabilization reefal slope carbonates earliest Cretaceous western Neotethys realm.