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Polycerella emertoni
Dorsal view of 3mm specimen
Ventral view
Lateral view
Lateral view
Gills
Spawn deposition, in vitro
Spawn deposit on Zoobotryon sp.
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Polycerella emertoni A.E. Verrill, 1880
Polycerella emertoni is a very small sized cryptic polycerid nudibranch. It is pale in colour and feed on the bryozoan Zoobotryon sp. It is a common species but is rarely seen in the field due to its small size, pale colour and cryptic habit.

Rhinophores: Short, smooth, almost transparent with small opaque yellow green spots; non-retractile.
Gills: Bipinnate, three in number, small, transparent with yellowish spots.
Body: Polycerid like, base colour is transparent with opaque yellow-green spots and minute dark brown dots; two large finger-like appendages present dorso-laterally behind gills, smaller appendages found behind the larger ones.
Foot: Transparent white in colour, narrow, without appendages.

Size range: 2-4mm. Uncommon, but may be overlooked.

Specific characteristics: This species is easily identified once the specimen is seen! Its small size, colour, shape, presence of 3 gills and digitate appendages are its typical characters.
3mm Qajjenza, <1m depth 18/08/93
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Marine species
CIESM.org
NUDIBRANCHIA
Polyceridae
Spawn deposition, in vitro
Lateral view of 3-4mm specimen
Dorsal view of 3mm specimen
Gills
Ventral view of 3mm specimen
Lateral view of 3-4mm specimen
Spawn deposit on Zoobotryon sp.