nauclerus

from The Century Dictionary.

• noun In ornithology, a genus of Falconidæ, of the subfamily Milrinæ; the swallow-tailed kites.
• noun In ichthyology, a spurious genus of fishes, based on the young of Naucrates, or a stage of development of the young pilot-fish, Naucrates ductor, when a first dorsal fin and preopercular spines are present.
• noun The stage of growth represented by the spurious genus Nauclerus, 2, as of Seriola or any other genus of carangids.