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Species: Prionotus birostratus, Two-beaked searobin

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head flattened
snout plates long
C: 3 dark bars
preopercular crest: 2 rear spines
pectoral long, border concave, black + white base & bar

Prionotus birostratus Richardson, 1844

Two-beaked searobin

Head flattened, snout plates strongly projecting at front; wide between eyes; no transverse groove across top of head behind eyes; bony ridge under eye with 2 spines at rear; teeth on jaws and roof of mouth simple; ~ 5-6 well developed lower gill rakers; two separate dorsal fins, X + 10-12; pectoral fins long, reaching past center of anal base, 13-14 rays, with 2-3 enlarged, but relatively short, free rays at bottom of fin, rear margin of main pectoral concave; body with rough scales; rear flap of operculum with scales; nape scaled; lateral-line scales 50-55.

Head and upper body grey-brown, a row of red-brown spots along center of flank; 1st dorsal pale, with an irregular blackish bar from the tips of the front spines down to the center of the fin base; second dorsal pale, dusky outer margin and rear part of fin; tail with 3 dark bars formed by vertical rows of blackish spots; anal clear; pectoral black with a whitish base and a whitish bar across its center.

Size: 18 cm.

Habitat: sand-mud bottoms.

Depth: 20-60 m.

Southern Baja and the Central Gulf of California to Ecuador.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Mud
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Bony fishes
  • Pelagic crustacea
  • Zooplankton
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic
  • Pelagic larva
  • No data
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continental TEP endemic
  • TEP endemic
  • All species
  • Continent only
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • Continent
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 18
Depth Range Min
  • 20
Depth Range Max
  • 60