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Additional Photos
rhinophores
hood
eggs?
associated alga
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Melibe sp. #2
Maximum size: about 50 mm.
Identification:
This
is a translucent-yellow species frosted with opaque-yellow flecks and
with white flecks on its tubercle and rhinophore tips. It has three
pairs of nearly spherical cerata, the posterior pair much smaller than
the
anterior two. (Note 1)
The surfaces of the cerata and body are covered with low conical
tubercles which grade into elongate papillae on top of the oral hood.
The oral hood is small with short tentacles. The rhinophores are long
and lack posterior crests on their stalks. The cups surrounding the
rhinophore clubs are tuberculate and a line of small tubercles runs
down the posterior edge of each rhinophore stalk.
Natural history: Melibe
sp. #2 is known from one animal found crawling on coral rubble at 12 m
(39 ft), at an exposed site. It probably lays an elevated, spiral egg
mass (assuming the photographed mass is from same species). (Note 2 )
Distribution: Oahu: perhaps, also known from the Philippines? (Note 3 )
Taxonomic notes: It was
first recorded in Hawaii from Kanaloa Bay, Oahu by Sabina Alistar on April 6, 2024.
Photo: Sabina Alistar: about 50 mm: Kanaloa Bay, Oahu; April 6, 2024.
Observations and comments:
Note 1:
One ceras from each pair has been autotomized in the photographed animal (right one
in anterior pair, left one in posterior two pairs). There's also a hint of a fourth, even smaller, pair in the first photo.
Note 2: Like Melibe sp. #1, perhaps this species is mimicking the alga it's associated with (Sarcinochrysis marina). Sabina reported: "They're very easy to confuse with the yellow blobby algae that are all over the place."
Note 3: A similar animal from the Philippines is transparent-white rather than yellow. (see photo by Franca Wermuth-Vezzoli)
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