Pleurobranchaea sp. #1
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a large tan species with a foot that extends well beyond the
notum and has a dorsal spur at its tip. The oral veil has sensory
papillae and the rhinophores are long and triangular. The notum varies
from flattened to nearly spherical, perhaps depending on whether the
animal has recently fed.
predator, Pleurobranchaea sp. #1 has
been photographed from submersibles at
376-521 m (1233-1709 ft). Recent photos extend the range to about 1500
m (4921 ft).
Big Island, Molokai, Oahu and Pearl & Hermes Reef: also known from the Line Islands. (Note 1)
first recorded in Hawaii by the Undersea Research Laboratory (HURL)
during Pisces submersible dive # P5-11, principal investigator
Alexander Malahoff, July 17, 1987.
HURL-NOAA archives, Robert Moffitt (PI): side; about to feed?: 425 m
(1394 ft); Oahu;
Sept. 6, 1998.
Observations and comments:
1: A clearer photo taken in the
Northwest Hawaiian Islands during a NOOA-Okeanos Explorer expedition at between 1000 & 3000 m (3280
& 9840 ft) can be seen here. The Okeanos Explorer expeditions have also photographed them in the Line Islands.