1: slug 1.5 mm long, rhinophores started to develop.
2: slug 3.2 mm long, rhinophores spatulate and half grown.
3: slug 4.1 mm long, rhinophores nearly full length but still spatulate.
4: slug 3.7 mm long, rhinophores fully developed, cylindrical and digitiform.
5: slit at anterior of head for holding filaments of Cladophora while feeding.

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