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Species: Prognathodes aculeatus, Longsnout butterflyfish

All Families:   All Genera:   All Species:

back orange; D & top back black
orange bars: eye & tail base
A & pelvics yellow

Prognathodes aculeatus (Poey, 1860)

Longsnout butterflyfish

Body a strongly compressed oval disc; mouth small, at end of a moderately long, pointed snout; cheek bone free and smooth; teeth long and slender, brush-like, in bands on jaws; dorsal fin XIII 18-19, fin triangular, with front spines longest, membranes between anterior dorsal spines deeply incised; anal rays III, 14-16, 2nd anal spine longer than 3rd; pectoral rays 13; rear edges of dorsal and anal fins vertical; tail edge straight to rounded; scales rough, covering head and body, a low scaly sheath on base of dorsal fin; lateral line in a high arch, incomplete (ends under dorsal fin), with 39-43 scales; with a large "axillary process" scale at the upper base of the pelvic fins.

Upper body yellow-orange at front, becoming dark brown on and under the spiny dorsal fin; an angled yellow-brown bar through eye; an orange bar from soft dorsal fin down across tail base; pelvics and anal fin yellow.

Size: grows to 9.5 cm.

Habitat: rocky and coral reefs.  

Depth range: 1-177 m, commonest at 15-55 m.

N Carolina to Guyana. Its Brazilian sister species is P. brasiliensis.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Rocks
  • Corals
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
FishBase Habitat
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Sessile worms
  • Mobile benthic crustacea (shrimps/crabs)
  • Data
  • Sea-stars/cucumbers/urchins
Egg Type
  • Pelagic
  • Pelagic larva
  • Data
Global Endemism
  • West Atlantic Endemic
  • All species.
  • Greater Caribbean endemic
Regional Endemism
  • GC endemic
  • Island (s)
  • Continent
  • All species..
  • Continent + Island (s)
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 9.5
Depth Range Min
  • 1
Depth Range Max
  • 177