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branchia
 

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Gymnodoris
sp. #11

 
Gymnodoris sp. #11
Maximum size: about 6-7 mm.

Identification:  This animal is translucent grayish-white tinged with orange. The notum is covered with many small, orange tubercles. The front of the head is shelf-like, without processes, and the oral tentacles are large and blunt (resembling an elongate fold). The rhinophores are proportionately small and close-set with about ten strongly angled lamellae and orange apexes. The branchia take the form of an arc of about 10 leaves that cover the anus. They have orange tips, orange tubercles on the rachis and faint white granules at their bases. The genital pore is slightly forward of the halfway point between the branchia and the rhinophores.

Natural history:  Gymnodoris sp. #11 is known from two animals found crawling rapidly, by day, on sand at about 30 m (98 ft). (Note 1)

Distribution:  Big Island.

Taxonomic notes:  It was first recorded in Hawaii from off Old Kona Airport Beach Park, Big Island by Marketa Murray on Aug. 1, 2021.

Photo:  Marketa Murray: about 6-7 mm: off Old Kona Airport Beach Park, Big Island; Aug. 1, 2021.

Observations and comments:

Note 1:  Marketa found them while photographing Siphopteron quadrispinosum. Perhaps, they prey on that species?
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