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Species: Hypleurochilus pseudoaequipinnis, Atlantic Oyster Blenny, Oyster Blenny

All Families:   All Genera:   All Species:

eye cirrus: tall stalk + basal branches
eye with THIN red radial spokes
upper body: groups of 4 spots - > 6 dark blotches
D black spot at front
no orange spots on head
5 pores each side lower jaw
pelvic I, 4

Hypleurochilus pseudoaequipinnis Bath, 1994

Oyster Blenny, Atlantic Oyster Blenny

Head large, blunt; body elongate, compressed; nostril with a simple cirrus; a single cirrus with 4-15 branches over eye; mouth opens at front, top margin of top lip free, that margin discontinuous at front; teeth like incisors, with a large curved canine at rear of each jaw; lower jaw with 5 pores on each side; gill membranes broadly fused on throat, gill opening ends at level of lower base of pectoral fin; dorsal fin with a deep notch between spiny and soft parts, spiny part distinctly lower than soft part, XI-XII, 13-14; pelvics I, 4; pectorals 14 rays; anal fin II, 14-15; fin rays unbranched, except on tail fin; lateral line in 2 parts, 1st curved down behind end of pectoral, ends under last dorsal spines, 2nd from mid-flank to above ~middle of anal fin; no scales.

Males greenish grey with small orange spots on upper body;with 5-6 square blotches on upper side, each composed of 4 dark spots overlain by orange dots; iris red with 8 red spoke-like bars radiating from pupil that are thinner than the pale spaces between them ; a dark spot at front of dorsal fin; a dark spot on the base of the pectoral; a dark spot at the base of the tail fin; a row of dark spots along the anal base.

Size: reaches 7.5 cm.

Habitat: mangroves and shallow rock outcrops; in turbid water and enters freshwater.

Depth: 0-24 m.

Bermuda to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Rocks
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Estuary
  • Freshwater
  • Mangrove
  • Reef (rock/coral/oyster)
  • Reef and soft bottom
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Data
  • Omnivore
  • Data
  • Benthic microalgae
  • Detritus
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 7.5
Depth Range Min
  • 0
Depth Range Max
  • 24