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. 2018 Dec 3;9:5125. doi: 10.1038/s41467-018-07575-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Digestive system of Limnoria. a Schematic lateral view of the animal (typically 2–3 mm long) showing one of the two bi-lobed hepatopancreases (Hp) connected to the anterior of the tubular gut; position of manifold (M) and filter system (FS) as indicated, food mass in hindgut indicated by dark coloration; pH values indicated at points measured. b Scanning electron micrograph of chitinous cuticle lining of the hindgut (scale bar, 5 µm). c Transmission electron micrograph of sectioned hepatopancreas cell with microvilli (Mv) facing the hepatopancreas lumen (scale bar, 2 µm). d Oxygen concentration measured by a microprobe withdrawn from the hindgut (Gut) through the body of four individual animals into surrounding seawater (scale bar, 0.5 mm)