Phylogenetic re-evaluation of fossil and extant micro-echinoids with revision of Tridium, Cyamidia, and Lenicyamidia (Echinoidea: Clypeasteroida) Author Mooi, Rich Department of Invertebrate Zoology and Geology, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, California 94118, USA. E-mail: rmooi @ calacademy. org Author Kroh, Andreas Naturhistorisches Museum Wien, Burgring 7, 1010 Vienna, Austria. E-mail: andreas. kroh @ nhm-wien. ac. at Author Srivastava, Dinesh K. Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India. E-mail: deardrdk @ gmail. com Corresponding author text Zootaxa 2014 2014-09-01 3857 4 501 526 journal article 5071 10.11646/zootaxa.3857.4.3 b8178736-7493-4f74-bc85-0188fc50473d 1175-5326 4930056 76021E0C-7542-455B-82F4-C670A3DC8806 Genus Fibularia Lamarck, 1816 Type species. Fibularia ovulum Lamarck, 1816 by ICZN Opinion 207 (1954: 350) . Emended diagnosis. Small, occasionally almost spherical fibulariids entirely lacking internal buttresses; interambulacra very wide at ambitus, over 70% width of ambulacra; ambulacral plates very high at ambitus, each plate almost as high as wide.