Fossilized Shark Tooth Identification Chart | Species Guide

Shark Tooth Identification — Caspersen Beach (Venice, FL)

Spot the shape, check the serrations, read the root—then whisper “Miocene magic.” This guide mixes common Gulf finds with classic fossils.

How to ID (fast)

  • Outline: broad triangle (bull/lemon/white), notched blade (tiger), narrow spear (mako), needle dagger (sand tiger).
  • Serrations: coarse (bull/tiger/white), fine (lemon/blacktip/hammerhead), none (sand tiger).
  • Tip (cusp): thick vs. needle; centered or leaning; cuplets (sand tiger).
  • Root: wide squared shoulders (bull), shallow neat base (lemon), massive lobes (meg fragments).
  • Color: Venice = tan/gray/jet black enamel; roots often lighter/porous.
Bull shark tooth: stout triangular crown with coarse serrations and wide squared root

Bull Shark (Carcharhinus leucas) — Common

  • Stout triangle; coarse serrations.
  • Wide, squared root shoulders.
  • Look for: thick crown, heavy feel ~1–1.5″.
Lemon shark tooth: broad clean triangle, fine serrations, shallow even root

Lemon Shark (Negaprion spp.) — Common

  • Broad, neat triangle; fine serrations.
  • Shallow, even root.
  • Look for: “perfect little pizza slice.”
Blacktip or spinner shark tooth: small narrow triangle with fine serrations and delicate root

Blacktip / Spinner (C. limbatus / C. brevipinna) — Frequent (small)

  • Tiny (<¾″), narrow triangle; fine serrations.
  • Delicate root.
  • Look for: thin, sharp arrowheads.
Sandbar shark tooth: broad triangle with fine serrations, tall robust root

Sandbar Shark (Carcharhinus plumbeus) — Occasional

  • Broad triangle; fine serrations.
  • Tall, robust root.
  • Look for: strong shoulders, neat blade.
Dusky shark tooth: triangular crown with fine serrations and slightly narrower root

Dusky Shark (Carcharhinus obscurus) — Occasional

  • Triangular, fine serrations.
  • Root slightly narrower than lemon.
  • Look for: balanced triangle, subtle shoulders.
Tiger shark tooth: heavy notch on cutting edge with coarse serrations and stout root

Tiger Shark (Galeocerdo cuvier) — Occasional

  • Bold “shoulder notch”; coarse serrations.
  • Sturdy root.
  • Look for: dramatic notch near base of blade.
Sand tiger shark tooth: long needlelike cusp with no serrations; small side cusplets

Sand Tiger (Carcharias taurus) — Occasional

  • No serrations; long needle tip.
  • Often tiny side cusplets.
  • Look for: slender “dagger.”
Hammerhead shark tooth: symmetrical triangle, straight edges, fine serrations, low root

Hammerhead (Sphyrna spp.) — Occasional

  • Symmetrical triangle; straight edges.
  • Fine serrations; low root.
  • Look for: “perfect isosceles.”
Bonnethead shark tooth: small triangular crown with fine serrations and shallow root

Bonnethead (Sphyrna tiburo) — Occasional (small)

  • Small triangles; fine serrations.
  • Shallow root.
  • Look for: petite, neat symmetry.
Shortfin mako tooth: narrow spear-like crown with smooth edges and robust root

Shortfin Mako (Isurus oxyrinchus) — Uncommon

  • Narrow spear; no serrations (smooth edge).
  • Robust root.
  • Look for: glossy, blade-like crown.
Longfin mako fossil tooth: narrow spear crown with smooth edges and slimmer root

Longfin Mako (Isurus paucus) — Uncommon

  • Spear blade; smooth edges.
  • Slimmer root than shortfin.
  • Look for: elegant, needlelike profile.
Great white fossil tooth: tall triangular crown with coarse serrations and strong shoulders

Great White (Carcharodon carcharias) — Rare (fossil)

  • Tall triangle; coarse serrations.
  • Strong shoulders.
  • Look for: “poster” shark-tooth look.
Megalodon tooth fragment: thick enamel blade with large serrations and massive root lobe

Megalodon (Otodus megalodon) — Fragments Common

  • Very thick enamel; big root lobes.
  • Large, even serrations (on intact edges).
  • Look for: weighty straight blade chunks.
Otodus chubutensis fossil tooth: triangular crown with coarse serrations, transitional ancestor to megalodon

Otodus chubutensis — Rare (fossil)

  • Triangular crown; coarse serrations.
  • Transitional ancestor to meg.
  • Look for: meg-like but slimmer lobes.
Hemipristis serra snaggletooth: strongly serrated distal edge with smooth mesial edge and hooked tip

Snaggletooth (Hemipristis serra) — Occasional (fossil)

  • One edge smooth, the other heavily serrated.
  • Hooked, dramatic tip.
  • Look for: asymmetrical saw-edge.
Fossil tiger shark tooth Galeocerdo aduncus: triangular blade with big notch and coarse serrations

Fossil Tiger (Galeocerdo aduncus) — Occasional (fossil)

  • Pronounced notch; coarse serrations.
  • Classic tiger outline.
  • Look for: chunky, saw-toothed blade.
Nurse shark fossil tooth: small pavement-style crown with low ridges and squat root

Nurse Shark (Ginglymostoma) — Uncommon (fossil)

  • Pavement-style crowns; low ridges.
  • Squat root.
  • Look for: flat, blocky look.
Smoothhound shark tooth: tiny low-cusped crown with smooth edges and shallow root

Smoothhound (Mustelus spp.) — Uncommon (small)

  • Tiny, low cusp; smooth edges.
  • Shallow root.
  • Look for: very small, subtle teeth.
Atlantic sharpnose shark tooth: tiny triangular crown with very fine serrations

Atlantic Sharpnose (Rhizoprionodon terraenovae) — Uncommon (small)

  • Tiny triangle; very fine serrations.
  • Delicate root.
  • Look for: micro-triangles.
Blue shark fossil tooth: narrow triangular crown with fine serrations and slender root

Blue Shark (Prionace glauca) — Occasional (fossil)

  • Narrow triangle; fine serrations.
  • Slender root.
  • Look for: thin, elegant blade.
Ray dental plate fragments: flat pavement-like tooth plates with hexagon pattern

Ray Dental Plates (Eagle/Cownose) — Very Common (fragments)

  • Flat “pavement” plates; hexagon patterns.
  • No cutting edges.
  • Look for: tile-like fragments.
Sawfish rostral tooth: long conical spike with smooth surface, not a shark tooth

Sawfish Rostral Tooth — Rare (not a shark tooth)

  • Long conical spike; smooth.
  • From the rostrum, not jaws.
  • Look for: uniform cone without serrations.

Others sell gear. We reveal the story.

Other Common Finds at Caspersen Beach

Not just shark teeth—these bits of ancient life tell the wider story under your toes.

Ray dental plate fragment: flat, tile-like chewing plate with hexagon pattern

Ray Dental Plates (Eagle/Cownose) — Very Common

  • Flat, pavement-like plates; often tiny hex tiles.
  • No cutting edge; smooth wear surfaces.
  • Look for: tile pattern and sandy tan/gray color.
Fossil stingray barb: tapered spine with tiny backward-facing denticles

Stingray Barb (Caudal Spine) — Common

  • Tapered spine with backward hooks (denticles).
  • Cross-section often oval; base thicker.
  • Look for: tiny serrations running along the edge.
Sawfish rostral tooth: long smooth cone from the snout, not a jaw tooth

Sawfish Rostral Tooth — Protected Species (ID Only)

  • Long, smooth conical spike; uniform surface.
  • Not a jaw tooth; from the snout “saw.”
  • Note: Treat as a viewing find; follow regulations.
Sea turtle shell fragment: curved plate with subtle scute seams

Sea Turtle Shell (Carapace/Plastron) — Do Not Collect

  • Curved plates; faint scute seams or ridges.
  • Protected—possession is illegal.
  • Look for: layered, lightweight feel; leave it on the beach.
Fossil fish vertebra: round spool-shaped bone with a central hole

Fish Vertebra — Common

  • Spool/“lifesaver” shape; central canal.
  • Often smooth from surf tumbling.
  • Look for: donut-like outline in cross-section.
Unidentified fossil bone fragment: porous interior with worn outer cortex

Bone Fragment (Likely Fish) — Occasional

  • Porous interior; worn outer cortex.
  • Caution: If you suspect marine mammal, do not keep.
  • Look for: lighter weight vs. stone; subtle grain.
Coquina shell hash: rock-like mass of tiny shell fragments fused together

Shell Hash (Coquina) — Very Common

  • Rock-like chunks packed with tiny shell bits.
  • Often pastel colors; porous texture.
  • Look for: mosaic of miniature shells.
Fossil coral: patterned stone with honeycomb or star-like corallite structures

Fossil Coral — Occasional

  • Honeycomb or star patterns (corallites).
  • Hard, stone-like; often gray or tan.
  • Look for: repeating geometric cells.
Fossil sea urchin spine: slender tapered rod, sometimes with faint ridges

Sea Urchin Spine — Occasional

  • Slender tapered rods; may show fine ridges.
  • Break cleanly; ceramic-like feel.
  • Look for: straight needles, tan/gray.
Fossil crab claw tip: curved, pointed piece with smooth enamel-like surface

Crab Claw Tip — Occasional (Fragments)

  • Curved, pointed; smooth outer surface.
  • Often darker than surrounding shell hash.
  • Look for: little “talon” shapes.
Fossil whelk fragment: thick shell piece with spiral curvature

Whelk (Gastropod) Fragment — Common

  • Thick shell; spiral curve on edges.
  • Ridges may remain on outer surface.
  • Look for: curved, heavy shards.
Fossil bivalve fragment: flat shell piece with growth rings

Clam (Bivalve) Fragment — Very Common

  • Flatter pieces; visible growth rings.
  • Often chalky white or tan.
  • Look for: layered, fan-like lines.
Coprolite: lumpy to cylindrical fossilized droppings with mineral sheen

Coprolite — Occasional

  • Lumpy or cylindrical; mineral sheen.
  • Heavier than it looks.
  • Look for: odd shapes with uniform texture.
Important: Some materials are protected by law (e.g., sea turtles, marine mammals, live shells). Enjoy identifying, photograph for learning, and leave protected items on the beach. When unsure, snap a photo and move on.
Arthur’s tip: “Beach zen: sort finds into ‘teeth, plates, bones, shells.’ Patterns pop when you group them.”