Marcusadorea efatensis is recorded from Vanuatu and the Solomon Islands.
Original description: "Cosciniopsis" efatensis Tilbrook, 2006.
Locality: Vanuatu
Type specimen: BMNH 1998.8.4.265, Paratype: BMNH 1998.8.4.278.
Description from Tilbrook, 2006. (PDF file)