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Species: Chasmodes longimaxilla, Stretchjaw Blenny

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olive, mottled
top jaw long ~17 % SL
D blue spot at front, then long orange streak
no skin flaps under sides of chin
lower teeth pointed
usually 11 gill rakers

Chasmodes longimaxilla Williams, 1983

Stretchjaw Blenny

Elongate, compressed; short blunt head with pointed snout and curved front profile; a single, small cirrus at eye (sometimes missing), a filamentous flap at front nostril; top jaw relatively long, usually 17.3 (15.5-20)% of SL; teeth closely packed, no canines; lower jaw teeth with distinctly pointed tips; front sides of lower jaws without prominent skin flaps; 11 (9-12) gill rakers; gill openings restricted to sides of body by fusion of gill cover membranes to throat; dorsal fin with at most a slight notch between spiny & soft parts, XI, 16-19; anal fin II, 16-20; tail fin with 10-11 segmented rays; pectoral usually 12; fin rays unbranched, except on tail fin; lateral line ends about mid-body; no scales.

Olive to greenish, with light stripes and mottling; an iridescent blue spot between dorsal spines I-II, an orange streak from that spot to ~spine X.

Reaches 9.4 cm.

Lives in oyster beds, sometimes in seagrass beds; usually in brackish water.

Depth range: 0-10 m.

The Gulf of Mexico.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Rocks
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Submerged vegetation
  • Estuary
  • Reef (rock/coral/oyster)
  • Reef and soft bottom
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Detritivore
  • Data
  • Bony fishes
  • Detritus
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Continent
  • Continent only
  • GC endemic
  • Gulf of Mexico endemic
  • All species
  • Resident
Climate Zone
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 9.4
Depth Range Min
  • 0
Depth Range Max
  • 10