dallia pectoralis

from The Collaborative International Dictionary of English v.0.48

Xenomi \Xen"o*mi\, prop. n. pl. [NL., from Gr. xe`nos strange.]
   (Zool.)
   A suborder of soft-rayed fresh-water fishes of which the
   blackfish of Alaska ({Dallia pectoralis}) is the type.
   [1913 Webster]