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underside
 

side
 

front
 


lightly spotted
 


less iridescence


with brown
 


young, 1.4 mm
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GALLERY



 
Costasiella
sp. #1
 
Costasiella sp. #1
Maximum size:  4.5 mm.

Identification:  This species has a white body flecked with opaque white and a mask-like black patch confined to the region behind the eye spots. Branches of the digestive gland in the cerata shade from dark green basally to light orange apically. The cerata are decorated with iridescent green to white flecks and have bluish tips. The rhinophores are white, often with slightly dusky bases. Rarely, there may be a touch of brown on the head. In mature animals the central cerata may become somewhat flattened but not to the extent seen in Costasiella sp. #2. The opaque-white flecks on the head and iridescent flecks on the cerata may also become less obvious in some mature animals.

Natural history:  Costasiella sp. #1 is a moderately rare species found in moderately protected to moderately exposed rocky habitats at depths of  1-5 m (3-16 ft).

Distribution:  Maui, Oahu and Kauai: probably widely distributed in the Indo-Pacific.

Taxonomic notes:  It was first recorded in Hawaii from Hekili Point, Maui by CP on June 1, 1991.

Photo:  CP: 3 mm: Maalaea Bay, Maui; Oct. 21, 2002.

Observations and comments:

Note 1: 
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