Shorefishes of the Eastern Pacific online information system

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Species: Stegastes beebei, Galapagos ringtail damselfish, Southern whitetail major

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dark + white band around tail base
pectoral border: white & yellow
juvenile:brown, nape & D red

Stegastes beebei (Nichols, 1924)

Galapagos Ringtail Damselfish, Southern Whitetail Major

Body oval, compressed; 1 pair of nostrils; margin of preopercle serrated; margin of bone under eye serrated, without notch it and the bone before it;mouth small, protrusible; teeth in single row, long and close-set; lower gill rakers 11 (10-12); a single continuous dorsal fin, XII, 15 (14-16); anal rays II, 13 (rarely 14); pectoral rays 20-21 (rarely 22); no projecting short spines at upper and lower base of tail fin; caudal fin bluntly forked; scales are moderately large and rough; body scaled, head largely scaled (snout scaled to nostrils), as are the basal parts of the median fins; lateral-line scales 20 (rarely 19); lateral line incomplete, ends under end of dorsal fin base.

Dark brown with darker scale outlines, often with white band on caudal peduncle, also with a blue iris and white or yellow outer edge of pectoral fin. Juvenile dark with red nape, upper back and spiny dorsal, and a dark ocellus at rear base of dorsal fin; base of tail fin with an indistinct whitish bar.

Size: grows to 17 cm.

Habitat: common along rocky shores.

Depth: 0-15 m.

Resident populations in the Galapagos Islands, Malpelo and Cocos, vagrants on the coast of Costa Rica,the Pearl Islands, Panama, the coast of Ecuador and Peru.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Omnivore
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Benthic microalgae
  • Sessile worms
  • Data
  • Sessile crustacea
Egg Type
  • Data
  • Pelagic larva
  • Benthic
Global Endemism
  • All species
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • All species
  • TEP endemic
  • Continent + Island (s)
  • Multiple oceanic islands endemic
  • Continent
  • Island (s)
  • TEP oceanic island (s) endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Vulnerable
  • Listed
  • Not listed
Length Max
  • 17
Depth Range Min
  • 0
Depth Range Max
  • 15