Rare Hybodus Shark Cephalic Spine Fossil Jurassic Lyme Regis Dorset UK Lower Lias Genuine Hybodont Shark Fossil Black Ven Jurassic Coast

Description

Rare Hybodus Shark Cephalic Fossil – Lower Lias, Black Ven, Lyme Regis

Presented here is a rare Hybodus shark cephalic fossil, recovered from the famous Lower Lias deposits at Black Ven near Lyme Regis, Dorset, England, along the internationally recognised Jurassic Coast UNESCO World Heritage Site. Dating to the Early Jurassic Period, approximately 201–190 million years ago, this specimen represents an unusual and highly collectible fossil from one of Britain’s most important fossil-bearing formations.

This fossil has been carefully selected as an attractive and authentic specimen, and the photographs in the listing show the exact fossil you will receive. The fossil is supplied with a fully hand-signed Premium Certificate of Authenticity, confirming that the specimen is genuine.

Full sizing and scale are visible in the listing photographs.

Hybodus – An Iconic Jurassic Shark

The fossil belongs to the extinct shark genus Hybodus, a member of the family Hybodontidae within the order Hybodontiformes. Hybodont sharks were among the most widespread and successful shark groups during the Triassic and Jurassic periods, inhabiting both marine and brackish environments.

Unlike many modern sharks, hybodonts possessed a combination of anatomical features that distinguished them from modern lineages. They had distinctive dorsal spines, robust jaws, and varied tooth types adapted for different feeding strategies.

Typical features of Hybodus sharks include:

• Slender, streamlined body adapted for active swimming

• Powerful jaws containing multiple tooth types

• Defensive dorsal fin spines

• Unique cephalic spines located on the head of males

The cephalic spine represented by this fossil is one of the more unusual anatomical structures in these sharks.

Cephalic Spine Structure and Function

The cephalic spines of Hybodus were small, specialised spines located near the head region. These structures are believed to have been present primarily in male individuals and may have played a role in reproductive behaviour, possibly assisting during mating.

Cephalic spines are relatively rare fossils because they were smaller and more delicate than other skeletal elements. Their identification is based on characteristic morphology including:

• Elongated spine-like structure

• Distinct enamel ornamentation or ridging

• Dense mineralised composition

• Tapering profile adapted for attachment in soft tissue

Because sharks possess skeletons composed largely of cartilage, the preservation of anatomical elements such as cephalic spines is particularly significant for understanding the biology of ancient shark species.

Lower Lias Formation – Early Jurassic Marine Environment

This specimen originates from the Lower Lias Group, one of the most important fossil-bearing sequences in the United Kingdom. These sediments were deposited during the Early Jurassic, specifically the Hettangian to Sinemurian stages, approximately 201–190 million years ago.

At that time, southern Britain lay beneath a warm shallow epicontinental sea connected to the Tethys Ocean. Fine marine sediments accumulated slowly on the sea floor, forming layers of mudstone and marl that now make up the cliffs of Lyme Regis.

These deposits preserve an extraordinary range of marine life including:

• Marine reptiles such as ichthyosaurs and plesiosaurs

• Numerous ammonite species used for stratigraphic dating

• Belemnites and crustaceans

• Bony fish and sharks

• Marine invertebrates

The Lower Lias is divided into detailed ammonite biozones, allowing scientists to determine the precise age of fossils within these strata.

Black Ven – A World-Famous Fossil Locality

The fossil was discovered at Black Ven, one of the largest landslip complexes along the Dorset coast and one of the most productive fossil sites in Britain.

Black Ven exposes extensive sections of the Lower Lias, making it a key location for collecting Jurassic fossils. Continuous erosion and landslips expose new fossil-bearing layers each year.

Lyme Regis has been central to the history of palaeontology since the early 19th century. Fossils discovered here by the pioneering collector Mary Anning played a major role in advancing scientific knowledge of prehistoric marine reptiles and Jurassic ecosystems.

Today, the area remains one of the most significant fossil localities in the world.

Fossilisation and Preservation

Shark skeletal material is rarely preserved because sharks possess cartilaginous skeletons, which decay rapidly after death. However, highly mineralised structures such as teeth and spines are far more durable and frequently fossilise.

When these structures settled on the sea floor, they became buried within fine marine sediment. Over millions of years, mineralisation preserved them within the surrounding rock.

Cephalic spines such as this specimen are particularly interesting fossils because they provide direct evidence of soft-tissue supported anatomical features that are rarely preserved in the fossil record.

Authenticity and Collector Information

• Genuine fossil specimen – not a cast or replica

• Fossil Type: Hybodus Shark Cephalic Spine

• Family: Hybodontidae

• Order: Hybodontiformes

• Geological Formation: Lower Lias Group

• Age: Early Jurassic (Hettangian–Sinemurian), approximately 201–190 million years old

• Locality: Black Ven, Lyme Regis, Dorset, United Kingdom

• Includes fully hand-signed Premium Certificate of Authenticity

• The exact fossil shown in the photographs is the specimen you will receive

This rare Hybodus shark cephalic fossil from the famous Jurassic Coast represents a fascinating addition to any Jurassic fossil collection, fossil shark display, or natural history cabinet, preserving a unique anatomical feature from one of the most successful shark lineages of the Jurassic seas.