Figure 4 from: Oliver G (2014) "TUBULAR GILLS" Extreme gill modification in the Thyasiroidea with the description of Ochetoctena tomasi gen. et sp. nov. (Bivalvia: Thyasiroidea). Zoosystematics and Evolution 90(2): 121-132. https://doi.org/10.3897/zse.90.8323 - Oliver, Graham (2014)