Figure 1 in Umbonal musculature and relationships of the Late Triassic filibranch unionoid bivalves

Figure 1. Phosphatized gill supports in Silesunio parvus gen. et sp. nov. from the early Late Triassic lacustrine deposits at Krasiejów, Southern Poland. A, general view of specimen ZPAL AbIII/2208 with valves in 'butterfly position'; gills visible as darker striated structures owing to staining with dark iron minerals. B, displaced sets of gill supports show bending independent of each other owing to the lack of interconnections (which proves a filibranch organization). C, D, specimen ZPAL AbIII/2168 with a more typical preservation of gill blades.Published as part of Skawina, Aleksandra & Dzik, Jerzy, 2011, Umbonal musculature and relationships of the Late Triassic filibranch unionoid bivalves, pp. 863-883 in Zoological Journal of the Linnean Society 163 (3) on page 865, DOI: 10.1111/j.1096-3642.2011.00728.x, http://zenodo.org/record/544192