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2(1). Abdomen with operculate gills (OG) i.e. gills modified to form a cover over more posterior gills (PG), present on segment 1 or 2 Note: Operculate gills can be damaged or removed by the rigours of sampling.
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-Abdomen without operculate gills, all abdominal gills exposed Note: Abdominal gills can be damaged or removed by the rigours of sampling.
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