Shorefishes of the Eastern Pacific online information system

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Species: Chromis atrilobata, Scissortail damselfish, Scissortail chromis

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grey + white spot under end of D base; pectoral base dark
C: lobes sharp, dark

Chromis atrilobata Gill, 1862

Scissortail chromis, Scissortail damselfish

Body compressed, elongate, greatest body depth 2.3-3.7 in SL; 1 pair of nostrils; edge of bone under eye smooth; preopercle smooth or with occasional fine serrations; mouth small, protrusible, opens at front; teeth in 2 rows, outer conical, larger; lower gill rakers 20-23; a single continuous dorsal fin, XII, 12-13; anal rays II, 10-12; pectoral rays 18-19; 2-3 short projecting spines at upper and lower base of tail fin; caudal fin forked, with sharp tips; scales large and rough; 20-21 lateral line scales; body scaled, most of head scaled, basal parts of the median fins scaled; lateral line incomplete, ends under end of dorsal fin base.

Metallic grey with prominent white spot just below end of base of soft dorsal fin; each caudal fin lobe with intensely blackish streak, a blackish mark at base of pectoral fin.

Size: attains 13 cm.

A common species that forms large aggregations around rocky reefs.

Depth: 1-80 m.

Central Baja and the Gulf of California to northern Peru, and all the offshore islands except Clipperton.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef only
  • Corals
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Reef (rock/coral/oyster)
  • Flotsam
FishBase Habitat
  • Reef Associated
Feeding Group
  • Planktivore
  • Data
  • Data
  • Pelagic fish eggs
  • Zooplankton
Egg Type
  • Pelagic larva
  • Benthic
  • Data
Global Endemism
  • All species
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Island (s)
  • Continent + Island (s)
  • All species
  • TEP endemic
  • Continent
  • Resident
Climate Zone
  • South Temperate (Peruvian Province )
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • North Temperate (Californian Province &/or Northern Gulf of California)
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 13
Depth Range Min
  • 1
Depth Range Max
  • 80