ABSTRACT

The oldest known specimens of the enigmatic mollusc Jinonicella kolebabai Pokorný, 1978 are redescribed from Middle Ordovician strata of Ukraine and Belarus. The phosphatic internal moulds preserve imprints of growth lines, hitherto only documented in Silurian specimens. The persistent distribution of Jinonicella in the Baltoscandian basin of the Russian Platform suggests that this was the centre of origin of this taxon. During the Silurian, Jinonicella inhabited Siberia and Laurentia, and the smaller European terranes of Bohemia and the Carnic Alps. In the Devonian, Jinonicella is reported from Laurentia, Bohemia and the Rhenish Massif.

摘要

已知最古老的神秘软体动物Jinonicella kolebabai Pokorný 标本，1978 年从乌克兰和白俄罗斯的中奥陶纪地层重新描述。磷酸盐内部模具保留了生长线的印记，迄今为止仅在志留纪标本中记录。Jinonicella在俄罗斯地台 Baltoscandian 盆地的持续分布表明这是该分类群的起源中心。在志留纪，Jinonicella居住在西伯利亚和劳伦蒂亚，以及波希米亚和卡尼克阿尔卑斯山的较小的欧洲地块。在泥盆纪，Jinonicella来自劳伦蒂亚、波希米亚和莱茵河地块。