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Species: Diapterus rhombeus, Rhombic Mojarra

All Families:   All Genera:   All Species:

spiny D edge dusky
lower gill rakers 16-18
A II, 9

Diapterus rhombeus (Cuvier, 1829)

Rhombic Mojarra

Body rhomboidal, compressed; the lower profile of the head distinctively concave; the mouth is highly extensible, pointing downward when protruded; jaws appear toothless but have tiny, brush-like teeth; teeth inside throat all pointed; margin of preopercle serrated; preorbital bone under eye smooth; 16-18 lower gill rakers; dorsal rays IX, 10, spiny part high, 2nd spine longer than distance between tip of snout and rear of eye; anal fin II,9, second spine long and stout, but shorter than fin base; pectoral fins relatively long, reaching slightly beyond anal fin origin; tail fin deeply forked; scales large, conspicuous and finely rough, covering most of head and body; dorsal and anal fins fold into a high scaly sheath along their bases.

Overall silvery; pelvic and anal yellowish; edge of spiny dorsal dusky.

Size: to 40 cm.

Inhabits sandy bays and estuaries, abundant in mangrove lagoons, may enter freshwater. Juveniles common in hypersaline lagoons and brackish water.

Depth: 0-70 m.

The Gulf of Mexico to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Submerged vegetation
  • Beach
  • Estuary
  • Freshwater
  • Mangrove
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Demersal
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
Egg Type
  • Data
  • Pelagic
  • 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
  • 40
Depth Range Min
  • 0
Depth Range Max
  • 70