In the freshwater Planorbid snails, however, the haemocyanin is replaced by haemoglobin, and thus their haemolymph is red rather than blue.
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Some gastropods, such as the sea hare Aplysia, appear to lack respiratory pigments altogether.
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In some genera, such as the large marine snail Busycon, the main anterior artery (which supplies the head and foot) includes an enlarged muscular region.
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