This lower Hemi is in virtually perfect condition, with beautifully intact serrations and a sharp edge. It has a beautiful light coloration with a bone white root. 

 

Why are they called snaggletooth sharks?

The name “snaggletooth” comes from the unusual shape of their teeth. In sharks like the extinct Hemipristis serra and the living Hemipristis elongata, the teeth don’t form a uniform cutting edge like in most sharks.

Instead, each tooth has one side with large, coarse serrations and the other side nearly smooth or finely serrated. This asymmetry gives the teeth a jagged, uneven appearance, which led to the name snaggletooth.

Diet and habitat

Snaggletooth sharks were active marine predators that lived in warm, shallow coastal seas. Fossils of Hemipristis serra are especially common in Miocene deposits, where marine ecosystems supported a wide range of prey.

Their diet likely included:

• Medium-sized fish
• Smaller sharks
• Other marine animals

Their tooth design suggests a grip-and-slice feeding style, allowing them to seize prey and tear flesh efficiently.

The modern Hemipristis elongata lives in similar environments today, favoring coastal waters in the Indo-Pacific.

Modern species

Today, the snaggletooth lineage is represented by Hemipristis elongata.

It is found in:

• The Indo-Pacific region
• Coastal waters of Southeast Asia, Australia, and East Africa

While smaller than Hemipristis serra, it still retains the same distinctive tooth design that defines the group.

Tooth morphology compared to other sharks

Snaggletooth shark teeth are highly specialized and show a clear distinction between upper teeth and lower teeth, each serving a different function.

Upper teeth:

• Broad and triangular
• Strongly asymmetrical
• One edge has large, coarse serrations
• The opposite edge is smoother or finely serrated
• Built primarily for slicing and tearing flesh

Lower teeth:

• Narrower and more elongated
• Often more curved or hook-like
• Serrations are smaller, finer, or more uniform
• Better suited for gripping and holding prey

This combination creates an effective feeding system where lower teeth secure prey and upper teeth do most of the cutting.

Compared to other sharks:

• Carcharodon carcharias has more uniform, triangular teeth designed for consistent slicing
• Otodus megalodon has large, symmetrical teeth built for cutting and crushing

Snaggletooth sharks stand out because of their asymmetry and division of function between upper and lower teeth, making them easy to recognize.

Why snaggletooth teeth are collectible

Teeth from Hemipristis serra are especially popular among collectors for several reasons:

• Distinctive appearance – The uneven serrations make them instantly recognizable, even to beginners
• Variety – Upper and lower teeth look noticeably different, giving collectors multiple forms to seek out
• Sharp detail – Well-preserved specimens can retain crisp serrations and fine edges
• Historical range – They come from rich Miocene deposits, tying them to a well-known prehistoric marine ecosystem

Although they are found in multiple localities, truly high-quality examples—with sharp serrations, intact tips, and minimal wear—are much harder to come by and are especially valued.

Evolutionary success and decline

The snaggletooth lineage was highly successful during the Miocene, with Hemipristis serra acting as a capable coastal predator.

Over time, environmental changes and competition likely contributed to its decline. The modern Hemipristis elongatais the last surviving representative, preserving the same unique tooth design that made its ancestors effective hunters.

What is Bone Valley?

Bone Valley is one of the most famous fossil-producing regions in the United States, located in central Florida. It’s not a single quarry, but a broad area within the Bone Valley Formation, primarily in Polk, Hillsborough, and surrounding counties.

The name “Bone Valley” comes from the incredible abundance of fossil material found there—especially bones and teeth from marine animals. For over a century, the region has been mined for phosphate, and in the process, it has produced one of the richest concentrations of Miocene–Pliocene fossils in North America.

Why Bone Valley fossils are so collectible

Bone Valley sits in a unique position for collectors—it offers high-quality fossils with real scientific significance, while still being obtainable compared to many other famous fossil localities.

Key reasons include:

Phosphate preservation – The fossils are heavily mineralized, often dense and durable, which helps preserve fine detail like serrations on shark teeth.

Diverse species – Fossils include a wide range of marine life, especially sharks like Otodus megalodon, Hemipristis serra, and many others.

Strong visual appeal – Bone Valley fossils are known for their darker colors—blacks, grays, and deep browns—which give them a bold, display-worthy look.

Historical importance – The region has been studied and collected for generations, making it a cornerstone of North American fossil collecting.

Even though large quantities of material have been recovered over time, high-grade specimens—sharp, complete, and minimally worn—are still highly sought after.

Age and environment

The Bone Valley Formation dates primarily to the Miocene and Pliocene epochs, roughly 5 to 20 million years ago.

At that time, much of Florida was submerged under a warm, shallow sea. This environment supported:

• Large predatory sharks
• Rays and bony fish
• Marine mammals
• Occasional terrestrial animals washed out to sea

Over time, layers of sediment rich in phosphate built up on the seafloor, burying and preserving remains in remarkable detail.

What makes Bone Valley fossils unique

Bone Valley fossils stand out for a few key reasons:

Heavy mineralization
Fossils are often unusually dense due to phosphate replacement, giving them a solid, almost stone-like feel.

Dark coloration
Most specimens range from gray to jet black, sometimes with hints of blue or brown. This coloration comes from the chemistry of the surrounding sediments.

Surface texture
Some fossils are smooth and polished from natural movement in sediment, while others retain crisp edges and fine details.

Mixed environments
While primarily marine, some fossils show evidence of transport, meaning material from different environments can end up preserved together.

Color rarity and collector appeal

Color plays a huge role in Bone Valley fossil desirability, especially with shark teeth.

• Blue coloration – Highly sought after and far less common than standard black or gray. Blue tones can range from soft slate to deeper steel-blue hues and are prized for their uniqueness and visual appeal.
• Green coloration – Considered a true “holy grail” among collectors. Green Bone Valley teeth are extremely rare and often command significant attention when they appear. The color likely comes from specific mineral conditions during fossilization that only occur in very limited circumstances.

Because each fossil forms in its own micro-environment, these unusual colors are unpredictable—making blue, orange and especially green specimens some of the most desirable pieces from the region.

Shark teeth from Bone Valley

Shark teeth are the most iconic fossils from Bone Valley. Species commonly found include:

• Otodus megalodon
• Hemipristis serra
• Various requiem and tiger sharks

These teeth are often:

• Thick and well-preserved
• Dark in color, sometimes with rare blue or green hues
• Either smoothly worn or sharply serrated depending on their history

Because sharks constantly replaced their teeth, the fossil record is especially rich in these specimens.