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Additional Photos

side

mantle lobes

shell

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Lobiger cf. souverbii Fisher, 1856

Maximum size: 17 mm.
Identification:
This
distinctive species is brilliant green with elongate, frilled
lobes projecting from the edges of its parapodia. Bright blue spots
connected by dark blue-green lines show through its transparent shell.
Natural history:
Lobiger cf. souverbii
is a rarely seen species found in tide pools and shallow rocky habitats
at depths of
< 1 to 6
m (< 3 to 20 ft) where it is associated with various algae of the
genus Caulerpa. It is found
in protected
to exposed locations. Mature animals are diurnally active but may
remain in the open when resting at night. When disturbed, they "flare"
the mantle lobes, presumably to elicit a startle response in predators,
and may autotomize the lobes. We have observed them feeding on Caulerpa taxifolia, Caulerpa ceratularioides, Caulerpa serrulata and the large
form of Caulerpa racemosa in
dishes. (Note 1) The egg mass
is a tightly coiled, cream spiral.
Distribution:
Maui, Oahu and Midway: possibly circumtropical.
Taxonomic notes:
Some
authors use Lobiger viridis
Pease, 1863 for the Indo-Pacific population (see the Sea Slug Forum
for
further discussion). It's possible that the Pacific and Atlantic
populations may ultimately be found to be distinct.
Photo: CP:
8.5 mm: Hekili Point, Maui; Oct. 7, 2002.
Observations and comments:
Note 1:
A captive animal with a shell length of 1.8 mm and a missing mantle
lobe regenerated the lobe and grew to a shell length of 5.2 mm in 60
days. It was fed primarily on Caulerpa
serrulata.
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