NEW AND EMENDED ACRITARCH TAXA FROM THE LOWER DAWAN FORMATION (LOWER ARENIG, HUANGHUACHANG SECTION, SOUTH-CHINA)

A new preparation (YHL66-1b) and re-examination of sample YHL66-1 alre ady studied by Yin (1995) from the lower Dawan Formation (lower Dawan Stage, lower Arenig), Huanghuachang Section (Yichang area, Hubei Provi nce, South China), allow the authors to recognize seven new species (P etaloferidium bulliferum Yin, Di Milia et Tongiorgi, sp. nov., Peteino sphaeridium coronula Yin, Di Milia et Tongiorgi, sp. nov., Picostella turgida Yin, Di Milia et Tongriorgi, sp. nov., Rhopaliophora florida Y in, Di Milia et Tongiorgi, sp. nov., Stelomorpha composta Yin, Di Mili a et Tongiorgi, sp. nov., Striatotheca monorugulata Yin, Di Milia et T ongiorgi, sp. nov., and Tongzia vavrdovae Yin, Di Milia et Tongiorgi, sp. nov.). A further species (Tongzia sp. 1) is described though left in open nomenclature. Two up to now monospecific genera (Picostella an d Tongzia) are emended, using additional information provided by new s pecies. (C) 1998 Elsevier Science B.V. All rights reserved.