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Species: Acyrtops beryllinus, Emerald clingfish

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nostril flap small
eye large
green + white/brown spots

Acyrtops beryllinus (Hildebrand & Ginsburg, 1927)

Emerald clingfish

Body fairly short; head relatively large; eye relatively large (67-77% of space between eyes); nostrils well separated, tubular; skin flap from nostril short, length = diameter of nostril; top lip narrow, about the same width at front as at sides; teeth at front of top jaw sharp pointed, compressed, with a patch of small, conical teeth behind them, lower incisors serrated; a few small fleshy lobes under lower jaw, but nowhere else on head; 6-7 broad gill rakers on 2nd arch; sucker disc relatively small (<25% of SL), with short papillae at front and rear and a small patch in center; pectoral fin 21 (20-22), lowest 5-7 rays distinctly reduced in size, a small fleshy pad on lower pectoral base; median fins short; 1 dorsal fin, at rear, no spines, dorsal fin 5-6; anal 6 (5-6), like dorsal fin and under it; tail 8; no scales; lateral line present as pores on head only.

Bright emerald green, covered with white spots and dots, or with brown spots and blotches.

Reaches 2.5 cm.

Lives in Thalassia seagrass beds.

Depth range: 1-15 m.

The Bahamas to Brazil.

Note: the taxonomic relationship between A. amplicirrus and A. beryllinus is confused and their distributions uncertain.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Submerged vegetation
  • Reef associated (reef + edges-water column & soft bottom)
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
Egg Type
  • Pelagic larva
  • Data
  • Benthic
Global Endemism
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Extends South of GC
  • Island (s)
  • Continent
  • GC non-endemic
  • Continent + Island (s)
  • Also in Brazil
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Tropical (10-23N, Nicaragua / Cuba)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 2.5
Depth Range Min
  • 1
Depth Range Max
  • 15