Shorefishes of the Eastern Pacific online information system

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Species: Stegastes arcifrons, Island major, Yellowtail gregory

All Families:   All Genera:   All Species:

dark yellow-brown
blue eye
lips, tail base, tips D & A, all of C: yellow
juvenile: brown; rear 1/4 yellow

Stegastes arcifrons (Heller & Snodgrass, 1903)

Yellowtail Gregory, Island 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 12-14; a single continuous dorsal fin, XII, 15 (rarely 16); anal rays II, 13 (rarely 12); pectoral rays 20 (rarely 19); 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, head and breast lighter, often with violet color on gill cover; pale yellowish lips; tail fin bright yellow; juveniles similar, but yellow of tail extends forward onto posterior part of body and rear of dorsal and anal fins; a large ocellated black spot near the base of the front of the soft dorsal.

Size: to 16 cm.

Habitat: abundant along rocky shores.

Depth: 1-30 m.

Galapagos Islands, Malpelo Island, and Isla del Coco, Isla Gorgona (Colombia) and Isla de la Plata (Ecuador).

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  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
  • Corals
  • Rocks
FishBase Habitat
  • Reef Associated
Feeding Group
  • Omnivore
  • Data
  • Benthic microalgae
  • Sessile crustacea
  • Mobile benthic crustacea (shrimps/crabs)
  • Sessile worms
  • Data
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • All species
  • Multiple oceanic islands endemic
  • Continent
  • TEP oceanic island (s) endemic
  • Island (s)
  • TEP endemic
  • Continent + Island (s)
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 16
Depth Range Min
  • 1
Depth Range Max
  • 30