Describes conchostracan valve morphologies, highlighting climate implications from the Early Permian.
The present study describes carapace valve morphologies of conchostracans (Crustacea) from the Bromacker Horizon (Tambach Sandstone Member, Tambach Formation, Rotliegend Group; Early Permian) of the Bromacker Lagerstätte in the Thuringian Forest Basin (Thuringia, Central Germany). Variations in valve morphology separate two morphotypes. The dominating morphotype 1 is Lioestheria andreevi (Zaspelova, 1968), regarded here as synonymous with Lioestheria monticula Martens, 1983. Much rarer is morphotype 2 with some individuals showing transitions to morphotype 1. Mass occurrence of conchostracans underlines the wet-dry seasonality of the past climate at Bromacker. Preservation of “soft” parts in the postero-dorsal parts of the body occurs in some specimens highlighting the Fossil-Lagerstätte quality of the Bromacker site. The recent radiometric dating of the Bromacker site shifts the lower limit of the “ Lioestheria andreevi – Pseudestheria form Wilhelmsthal assemblage zone” sensu Schneider & Scholze (2018) to the Asselian.
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Pint et al. (2026) studied this question.
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