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Species: Emblemariopsis ruetzleri, Bluegold Glass blenny, Ruetzler’s blenny

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head: small, low; snout: blunt, no crests
eye cirrus low, unbranched
D spines 1-2 >> 3-4, spines slightly elongate in female
male: front 1/2 black, D front white + black reticulations & spots
female: front D white; belly white + dark bar
PC 14

Emblemariopsis ruetzleri Tyler & Tyler, 1997

Ruetzler’s blenny

Body elongate; head small and shallow (depth 13.7-16.3% of SL), without spines; snout short and blunt, without a pair of bony ridges; a low, simple cirrus over eye; roof of mouth with 1 row of 7-8 teeth 1n center, 1 row of 7-8 teeth on each side; dorsal fin XX-XXI, 10-14, spines 1-2 >> spines 3,4 in male, slightly elongate in female, a slight notch between spiny and soft parts, soft part not longer than spiny part, membranes between spines and rays deeply indented; pectoral rays 14; anal fin II, 19-21; pelvics I (internal), 3, inserted before pectoral base, much shorter than pectorals; all fin rays unbranched; no lateral line; no scales.

Male (found in holes): head yellowish green with small black spots or black to back to level of pectoral fin base; pupil black, with a thin gold ring around it; eye cirrus cream with black spots; rest of body transparent except for prominent internal pattern of dark and light bars on upper abdomen and along vertebral column; membranes between first 3 dorsal spines white with black spots and reticulations, membranes behind that area clear with scattered black spots; a black spot at the base of each dorsal and anal fin ray; tail fin clear with white upper and lower edges. Female: transparent with same internal markings as male on belly and vertebral column.

Reaches only 2.2 cm.

Males live in holes in dead (rarely living) massive corals, females on algal turf on the same corals.

Depth range: 1-8 m.

The Caribbean.


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  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Barnacles & worm tubes
  • Rocks
  • Corals
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
FishBase Habitat
  • Reef Associated
Feeding Group
  • Carnivore
  • Planktivore
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Zooplankton
  • Data
  • Mobile benthic worms
Egg Type
  • Data
  • Benthic
  • Pelagic larva
Global Endemism
  • Greater Caribbean endemic
  • West Atlantic Endemic
  • All species.
Regional Endemism
  • Caribbean endemic
  • GC endemic
  • Continent
  • All species..
  • Continent + Island (s)
  • 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
  • Least concern
  • Listed
  • Not listed
Length Max
  • 2.2
Depth Range Min
  • 1
Depth Range Max
  • 8