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SEM-EDX spectroscopic images showing spectrum of elemental content in sediment encrusted on different regions of the lectotype of Zospeumschaufussi von Frauenfeld, 1862 (NHMW 71837). A–D Concentrations within yellow-framed zone of calcium (Ca), aluminum (Al), silicon (Si), magnesium (Mg), oxygen (O), carbon (C), iron (Fe), potassium (K), phosphor (P) and lead (Pb).
