Author: (Guichenot, 1848)
Remark: Vera & Pequeño
  (2001) compared the insular populations of Sicyases with
  those of continental Chile and supported the differentiation
  between insular and continental species. Vera & Pequeño
  (2001) followed De Buen (1960) in considering the
  insular species as S. hildebrandi rather than the earlier S.
  brevirostris. Sicyases brevirostris is considered by us as
  senior synonym of S. hildebrandi following Briggs’ (1955)
  conclusion based on examination of type material, rather
  than following De Buen’s doubt that Guichenot (1848)
  ever had specimens from the islands and his ascription
  of S. brevirostris as junior synonym of S. sanguineus.
  Briggs (1955) distinguished Sicyases brevirostris from S.
  sanguineus by a smaller head (>30% vs. <30% SL) and
  more anal fin rays (9 vs. 7-8). Vera & Pequeño’s (2001)
  study included an additional feature to distinguish both
  species: S. brevirostris with smooth skin and S. sanguineus
  with rugose skin except in the smallest specimens. Further
  research is needed, possibly at the molecular level, in
  order to determine whether these island populations are
  indeed distinct from their continental counterparts and if
  there has been any dispersal.
Comments: Species distinct from continental ones, and not syntopic with <i>Gobiesox marmoratus</i> Jenyns, 1842 (Ref. 89357).