Revised April 2018
synonyms: Flabellina gracilis (Alder & Hancock, 1844); Coryphella gracilis (Alder & Hancock, 1844)
Body (excluding appendages)
Usually up to 12mm, occasionally 15mm, long. Semi-transparent white, revealing internal anatomy [image4]. When mature, often at less than 10 mm, opaque white blobs of ovotestis visible . Discontinuous white opaque medial line from the rear cerata to tip of the tail .
Able to conceal posterior half of body, but dorsum often fully exposed. Arranged in up to 5, occasionally 6, longitudinal groups on each side of the body. Transparent white revealing bright red, orange-red, ginger-brown or green  granular internal digestive gland. Subapical narrow band of white surface pigment. Cerata arise from raised notal ridge , which is made noticeable by coloured section of digestive gland in it which connects with bases of cerata.
Smooth, sometimes slightly wrinkled. Translucent white with white surface pigment on distal half .
Translucent white oral tentacles  with white surface pigment distally. Oral tentacles similar length to rhinophores.
Anterior variably extended; often into short propodial tentacles . Semi-transparent white sole reveals white ovotestis, other viscera and cerata .
- Excluding appendages, the only surface pigment on the body is the discontinuous white medial line from the rear cerata to tip of the tail .
- White subapical ring on cerata is narrow .
- Mature with visible white opaque ovotestis lobules when less than 10mm .
- Usually to 12 mm, maximum 15mm, long.
- Prominent notal ridge on each side, often with coloured longitudinal section of digestive gland visible below cerata .
Coryphella lineata (Lovén, 1846)
White lines run along dorsum and sides of body, and the full lengths of the rhinophores and oral tentacles.
Grows to 50mm long.
Coryphella browni, Picton, 1980
Distal white ring on cerata wider than on C. gracilis.
Maximum length usually 30 mm, sometimes 50mm.
Coryphella verrucosa (M. Sars, 1829)
Interrupted white dorsal line on body becomes continuous on tail.
Maximum length 35mm.
Flabellina pellucida (Alder & Hancock, 1843)
White pigment covers distal end, including apex, of cerata.
Maximum length 40mm.
Offshore and LWS sheltered rocky shores with strong currents, on or near its prey; Eudendrium spp. (EML), Halecium articulosum and Clytia johnstoni (hydroids). Simultaneous hermaphrodite. Spawn looped around prey, or on rock, when it is a spiral line , in mid April, May and possibly other months. Veliger larvae drift as plankton before transforming into the adults.