Abstract
1. 1. The properties of the intracellular hemoglobin of Neodasys sp. are described and the utility of the hemoglobin in oxygen transport and storage is considered. 2. 2. The hemoglobin is located in immobile cells which occupy 14% of the total body volume. Heme concentration in these cells was 18.5 mM and the oxygen p50 ( in vivo) was approximately 1.0 mmHg. 3. 3. It is argued that oxygen storage is the most likely function of Neodasys hemoglobin. A simple geometric argument indicates that body wall oxygen transport is not greatly improved by facilitation. 4. 4. Respiratory function in Neodasys is compared with that in a related gastrotrich, Turbanella, which is morphologically similar and is sympatrie, but does not possess hemoglobin.
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