Auxiliary material for Paper 2010PA001930 Combined carbonate carbon isotopic and cellular ultrastructural studies of individual benthic foraminifera: 2. Toward an understanding of apparent disequilibrium in hydrocarbon seeps Joan M. Bernhard Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA Jonathan B. Martin Department of Geological Sciences, University of Florida, Gainesville, Florida, USA Anthony E. Rathburn Geology Program, Indiana State University, Terre Haute, Indiana, USA Bernhard, J. M., J. B. Martin, and A. E. Rathburn (2010), Combined carbonate carbon isotopic and cellular ultrastructural studies of individual benthic foraminifera: 2. Toward an understanding of apparent disequilibrium in hydrocarbon seeps, Paleoceanography, 25, PA4206, doi:10.1029/2010PA001930. Introduction The files include Figure S1 showing TEM images, along with a figure caption. It is very similar in layout to Figure 1 in the paper. Methods and collections were identical to those in the paper. 1. 2010pa001930-fs01.tif Additional transmission electron micrographs of analyzed foraminifera. A-B. Chilostomella ovoidea (non seep, #71, -0.4‰; live). Ropey or frothy psedudopodial cytoplasm (ps) in final chamber. m = mitochondria; ad = algal debris. C-E. Cibicidoides wuellerstorfi (seep, #58, 0.0‰, dead). C. Cell periphery showing remnant food vacuole contents: f = diatom frustule, mu = muscle, u = unidentifiable material; t = test location prior to decalcification. D. Highly degraded nucleus (n). E. Cell periphery showing two pores (pp) with ectobionts (e). F. Cibicidoides wuellerstorfi (seep, #60, -0.4‰, dead). Higher magnification view showing single pore with ectobionts and inorganic debris (d). Scale bars: A, C-E = 2 µm; B, F = 500 nm.