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contracted rhinophores
 

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Favorinus
sp. #1
 
Favorinus sp. #1
Maximum size:  14 mm.

Identification:  This species is very similar to Favorinus japonicus. However, it has violet subapical spots in its cerata that appear to represent pigment contained within the tips of the digestive gland branches. The cerata may also be slenderer and smoother, on average, than in F. japonicus.

Natural history:  Favorinus sp. #1 is a moderately common species found in moderately exposed to exposed rocky habitats and Halimeda kanaloana beds at depths of 4-9 m (13-30 ft). Like F. japonicus, it feeds on the eggs of other opisthobranchs and we observed one feeding on a cephalaspidean egg mass that was laid in a holding dish. It lays a white, spiral egg mass composed of a narrow ribbon that hatches in about four days in the laboratory.

Distribution:  Maui and Kauai.

Taxonomic notes:  There is some possibility that this species may turn out to be a color form of F. japonicus. It was first recorded in Hawaii from Airport Beach, Maui by CP on Sept 12, 1994.

Photo:  CP: 5 mm: found by PF; Whaler's Village, Maui; April 22, 2007.

Observations and comments:

Note 1:  ( )
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