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Species: Akko dionaea, Atlantic Specter-goby

All Families:   All Genera:   All Species:

mouth vertical, eye tiny
2 Ds joined
C joined to D & A
gills with papillae (no rakers)
pelvic disc cup-like, on stalk



Akko dionaea Birdsong & Robins, 1995

Atlantic Specter-goby

Body elongate; very small eyes; head without pores; vertical and horizontal rows of small papilla on head and operculum; mouth large, almost vertical; teeth elongate, large, depressible, lower teeth overlapping the upper jaw when closed; upper jaw slightly extendible, ends before level of center of eye; upper jaw with one row of depressible, long, well separated canines, lower with two rows, the outer row enlarged; gill opening from a little below top of pectoral base to a little above pelvic base, lower rear edge curved back; gill arches with simple to complex papillae rather than rakers; gill membranes broadly joined to body under throat, with 5 rays; dorsal, anal and tail fins with serially branched rays; dorsal fin VII, 15, fins connected along lower half of 1st ray of second fin; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal fin I, 15; dorsal and anal fins joined to tail fin; pectoral 17 rays, fin short, not reaching the end of the pelvic fin; pelvics fused in a deeply cupped, circular disc on a stalk, fin rays multiply branched; scales small, rounded, smooth, imbedded, not overlapping, about 76 in the lateral series; head and pectoral base scaleless; no lateral line.

Body colorless, with no markings; tail fin dusky on the margins, anal fin dusky on the outer rear edge.

Size: 8.3 cm.

Habitat: Found in muddy bottom coastal waters.

Depth: 15-20 m.

Colombia to the Amazon.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Estuary
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Data
  • Planktivore
  • Data
  • Zooplankton
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent only
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 8.3
Depth Range Min
  • 15
Depth Range Max
  • 20