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DescriptionNephtys incisa has a body measuring from 2.5-6.5 cm in length, divided into between 60 and 70 segments. When viewed in cross-section, the body appears rectangular. It has a prominent proboscis (feeding end of digestive tract) with numerous but very small papillae, except the mid-dorsal papilla, which is very large.Once the genus has been identified, it is not too difficult to identify individual species. However, mistakes can easily be made due to varying body length, and comparisons should be made on distinct fractions of the bodies (see Fauchald, 1977 for details).