Shorefishes of the Eastern Pacific online information system

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Species: Nexilosus latifrons, Coquito sergeant, Rusty damselfish

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brown + yellow bar, dark scale edges
juvenile: brown + blue spots
preopercle & bone under eye - edges smooth

Nexilosus latifrons (Tschudi, 1846)

Coquito sergeant, Rusty damselfish

Body oval, compressed; 1 pair of nostrils; margin of preopercle smooth; margins of bones under eye smooth, without notch between them, lower edge of rearmost of those two bones partly attached to cheek; mouth small, protrusible; teeth in single row, with flattened tips; gill rakers 20-21; a single continuous dorsal fin, XIII, 17; anal rays II, 13; pectoral rays 20-23; no projecting short spines at upper and lower base of tail fin; tail fin bluntly forked; scales are moderately large and rough; most of body scales with small accessory scales; body scaled, head largely scaled, as are the basal parts of the median fins; lateral-line scales 19-21; lateral line incomplete, ends under end of dorsal fin base.

Brown, with darker scale margins; lower head sometimes suffused with pink; an incomplete yellow to orange bar on middle of side; small blue spots on upper head and back; thin blue edging to dorsal, anal and pelvic fins; juveniles dark brown with a blue streak or spot on most scales, blue spots and lines on head, and narrow blue margins on most fins.

Size: attains a maximum length of 30 cm.

Inhabits rocky shores.

Depth: 1-10 m.

The southern Galapagos Islands, northern Peru to northern Chile.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef only
  • Rocks
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Omnivore
  • Data
  • Benthic macroalgae/seagrasses
  • Mobile benthic crustacea (shrimps/crabs)
  • Sessile crustacea
  • Sessile worms
  • Data
Egg Type
  • Benthic
  • Pelagic larva
  • No data
Global Endemism
  • East Pacific endemic
  • All species
  • TEP non-endemic
Regional Endemism
  • Temperate Eastern Pacific, primarily
  • Tropical Eastern Pacific (TEP) non-endemic
  • All species
  • Continent
  • Continent + Island (s)
  • Island (s)
  • Peruvian province, primarily
  • Resident
Climate Zone
  • South Temperate (Peruvian Province )
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 30
Depth Range Min
  • 1
Depth Range Max
  • 10