S. hypoleucus S. scrippsi S. craveri S. antiquus S. wumizusume Endomychura Synthliboramphus is a small genus of seabirds in the auk family from the North Pacific.

The English name "Murrelet" is a diminutive of "murre", a word of uncertain origins, but which may imitate the call of the common guillemot.

[1][2] The genus Synthliboramphus was introduced in 1837 by the German born naturalist Johann Friedrich von Brandt.

These birds breed in colonies, their eggs being laid directly amongst tree roots or in rock crevices.

They are nocturnal on the breeding grounds, presumably to reduce predation, and for the same reason the precocial young are never fed at the nest, being taken to sea a couple of days after hatching.