Revision of new species of Eocene sea urchins from Istria, described in the 19th and 20th centuries

In paper are presented drawings and pictures of sea urchins from original works of authors who determined and documented new species from Istria. TARAMELLI (1874), BITTNER (1880), OPPENHEIM (1901), TONIOLO (1909) and DEGLI INNOCENTI (1924 a, b) established in Paleogene beds of Istria 18 new species of Eocene sea urchins. Determined were four species of regular sea urchins of genera Stereocidaris, Phyllacanthus, “Eucidaris” and Arachniopleurus,and fourteen species of irregular sea urchins of nine genera - Conoclypus, Echinolampas, Rhyncholampas,Gitolampas, Ditremaster, Pericosmus, Prenaster, Brissopsis and Cyclaster. The highest species diversity was recorded within genus Echinolampas. New sea urchins species originate prevailingly in the Middle Eocene – Lutetian beds of localities in the narrower and broader surroundings of Koper, Buzet, Roč, Grdoselo, Pazin, Pićan, Ćepić and Labin