Nauticaris magellanica is the only representative of this genus inhabiting the southern part of South America. Ovigerous females were collected from mussel raft culture in Metri, central-southern Chile. Larvae were reared at 13°C and 31‰ in the laboratory from hatching
to the first juvenile stage. The larval development consists of a minimum of nine zoeal stages: the only juvenile obtained passed through five decapodid stages. Early developmental stages are described, and morphological characters of newly-hatched larvae were compared with those of N.
marionis: both species are separable using (1) the presence/absence of a row of small denticles located at the postero-dorsal margin of the fifth abdominal segment, and (2) the size of the larvae. Despite some differences between the morphology of the juvenile obtained and reported adult
characteristics, the juvenile was sufficiently developed to allow identification to the species level.
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