Nudibranch dorids from the Pacific Coast of Costa Rica with the description of a new species

We describe a new species of opisthobranch dorid, Atagema notacristata sp. nov., from Costa Rica and Panama, and redescribe four species of dorids from the Pacific Coast of Costa Rica. Atagema notacristala is distinctive among the described taxa in having a unique combination of the following features: light brown background color with no conspicuous spots, compound tubercles with caryophyllidia uniformly arranged oil the dorsum, short rhinophore sheaths, conical oral tentacles, five tripinnate branchial leaves, three branchial lobes, and a lobate blood gland. We redescribe Geitodoris mavis (Marcus and Marcus, 1967), Doris immonda (Risbec, 1928), Doris pickensi Marcus and Marcus, 1967, and Doris tanya Marcus, 1971, based oil new material recently collected from the Pacific Coast of Costa Rica. Doris immonda represents the first record of this Indo-Pacific species in the Eastern Pacific.