Shorefishes of the Eastern Pacific online information system

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Species: Sphyrna media, Scoophead shark, the Scoophead

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hammer angular
snout length ~ 1/3 hammer width
mouth arch rounded
A: rear edge concave

Sphyrna media Springer, 1940

Scoophead, Scoophead shark

A hammerhead shark with moderately broad, but short mallet-shaped side extensions of head (width of hammer 22-33% of TL); front margin of head broadly arched with very shallow lateral and central indentations; snout length before mouth usually ~ 1/3 of head width; only a short groove in front of nostril; mouth broadly arched; front teeth blade-like, smooth, lower teeth straight, upper teeth oblique, deeply notched on rear side, rear teeth like front teeth; five gill slits, last one over pectoral; first dorsal fin moderately large and erect, its rear margin noticeably concave, its free rear tip reaching over or behind the pelvic fin origin; second dorsal fin base about half length of anal fin base; origin of second dorsal fin above middle of anal fin; rear margin of anal fin strongly concave; transverse pit above tail base crescent shaped, a pit below tail base; tail fin strongly asymmetrical, notched under tip of top lobe, large lower lobe.

Grey brown on back and sides, lighter on under surfaces.

Reported to attain 150 cm; size at birth 30-35 cm.

A coastal species, demersal over soft bottoms.

Depth: 0-100 m?

Western Atlantic and eastern Pacific; the Gulf of California to Peru.

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  • Brackish
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Sand & gravel
  • Mud
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Bony fishes
  • Sea-stars/cucumbers/urchins
  • Octopus/squid/cuttlefish
  • No Data
  • Mobile benthic gastropods/bivalves
  • Pelagic crustacea
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No pelagic larva
  • Live birth
  • No data
Global Endemism
  • New world (East Pacific + West Atlantic)
  • Transisthmian (East Pacific + Atlantic of Central America)
  • East Pacific + Atlantic (East +/or West)
  • All species
  • TEP non-endemic
Regional Endemism
  • Island (s)
  • Tropical Eastern Pacific (TEP) non-endemic
  • Continent
  • All species
  • Continent + Island (s)
  • Eastern Pacific non-endemic
  • 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
  • Listed
  • Data deficient
  • Not listed
Length Max
  • 150
Depth Range Min
  • 0
Depth Range Max
  • 100