Hyžný Matúš, Mandic Oleg, Harzhauser Mathias, Ledvák Peter
Geological-palaeontological Department, Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria; Department of Geology and Palaeontology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia.
Geological-palaeontological Department, Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria.
Geol Carpath. 2016 Apr;67(2):167-178. doi: 10.1515/geoca-2016-0011. Epub 2016 May 14.
Although decapod crustaceans of the Central Paratethys were diverse during the Badenian (Langhian-Early Serravallian), a dramatic drop in their diversity occurred at the boundary with the Sarmatian. A crab is one of the few decapods reported from the Lower Sarmatian ( Zone) of the Paratethys. Until now, this species has been known from only a handful of specimens from Austria, Croatia and Bulgaria (Central Paratethys), and its systematics and ecology remain poorly known. Here, on the basis of new specimens from the Sarmatian tuffitic clays of the Stretava Formation (Skároš, Eastern Slovakia) we confirm that this species belongs to the subfamily Chasmocarcininae. The diagnostic characters of the male sternum that allow this classification are reported for the first time. The molluscan assemblage co-occurring with demonstrate that this species tolerated conditions with variable salinity. Its tolerance of a broad range of salinity regimes may thus explain its survival across the Badenian-Sarmatian extinction event. Preservation of near-complete and fully articulated individuals of suggests calm conditions and short residence times on the sediment-water interface.
尽管在巴登阶（兰盖阶 - 早塞拉瓦利阶）期间，中旁特提斯的十足目甲壳类动物种类繁多，但在与萨尔马提亚阶的边界处，它们的多样性急剧下降。螃蟹是旁特提斯下萨尔马提亚阶（地层带）报道的少数十足目动物之一。到目前为止，这个物种仅在来自奥地利、克罗地亚和保加利亚（中旁特提斯）的少数标本中被发现，其分类学和生态学仍然鲜为人知。在此，基于来自斯特雷塔瓦组（斯卡罗斯，斯洛伐克东部）萨尔马提亚凝灰质粘土的新标本，我们确认这个物种属于裂蟹亚科。首次报道了允许这种分类的雄性胸骨的诊断特征。与该物种共生的软体动物组合表明，它能耐受盐度变化的环境。因此，它对广泛盐度范围的耐受性可能解释了它在巴登阶 - 萨尔马提亚阶灭绝事件中的生存。保存下来的近乎完整且关节完全相连的该物种个体表明当时环境平静，在沉积物 - 水界面的停留时间较短。
