Discodorididae includes flattened dorids with tubercles, papillae or
caryophyllidia on the notum. Most are cryptic and nocturnal. It was
recently revised to
include the families Archidorididae, Asteronotidae, Kentrodorididae,
Platydorididae, and Rostangidae. It is the largest nudibranch family in
Hawaii with over 50 known species in 16 genera (Asteronotus, Atagema, Carminodoris, Diaulula, Discodoris, Geitodoris, Halgerda, Hiatodoris,
Jorunna, Montereina, Paradoris, Platydoris, Rostanga, Sclerodoris, Tayuva and Thordisa).
It's possible that the species listed as "Platydoris sp." in Kay & Young
(1969) might be Platydoris sanguinea
Bergh, 1905 but it needs confirmation. Unidentified
may be in this family. Also, the animal referred to as "Another rigid
species with broad thin margins..." on page 182 of Edmondson, 1946 is
probably in this family but is likely unasignable.