Uncommon in the Solitary Islands Marine Park. Distributed generally throughout Western Pacific, Australia, Phillipines and Japan.
Found in association with unidentified red gorgonian. Specimens in photographs recorded depth at around 21 m.
The shell is yellowish white, with a reddish mantle and yellow compound papillae. Grows to about 32 mm.
Atlas of Living Australia website at https://bie.ala.org.au/search?q=Pellasimnia+improcera. Accessed 09/11/2018.