#regular echinoid fossil UK

[uk-fossils]

Hyposalenia Regular Echinoid Fossil - Greensand, Cretaceous, Seaton Devon UK - Genuine Specimen with Certificate

This listing features a well-preserved Hyposalenia regular echinoid fossil, discovered on 24 March 2025 by our expert fossil hunting team Alister and Alison at Seaton, Devon, United Kingdom. This small and beautifully detailed sea urchin fossil has been expertly cleaned, prepped, and treated by Alison, ensuring excellent preservation and scientific integrity.

Hyposalenia is a genus of regular echinoids (sea urchins) from the Cretaceous period, typically found in Greensand deposits. These echinoids are characterised by their symmetrical, globular test and neatly arranged tubercles that once supported spines. They lived in shallow marine environments, contributing to the rich biodiversity of the Cretaceous seas.

The fossil pictured is the exact specimen you will receive, shown alongside a 1cm scale cube for accurate sizing.

Geological & Fossil Context:

Species: Hyposalenia sp. (Regular echinoid)

Type: Fossilised marine invertebrate (sea urchin)

Formation: Greensand

Location: Seaton, Devon, United Kingdom

Age: Cretaceous (~145–66 million years ago)

Fossil Features:

Preservation: Excellent, with complete shell and tubercle detail

Preparation: Professionally cleaned, stabilised, and treated by Alison

Condition: Ready for study, education, or display

Product Highlights:

100% Authentic Fossil Echinoid

Discovered and prepared by Alister & Alison

Supplied with a Certificate of Authenticity

Ideal for collectors, educators, or fossil enthusiasts

The Greensand deposits of Seaton are well known for yielding marine fossils, and this Hyposalenia echinoid is a rare and valuable example. Its beautiful symmetry and preservation make it both a scientifically significant and aesthetically pleasing addition to any collection.

Please consult the listing photos for full sizing and details. The specimen shown is the exact one you will receive.

Add this genuine Cretaceous echinoid to your fossil collection today with this exceptional Hyposalenia fossil from Devon.

[uk-fossils]

Pygaster Fossil Regular Echinoid Jurassic Dorset UK Genuine Specimen

Featured here is a genuine Pygaster fossil, a well-preserved example of a regular echinoid (sea urchin) from the Jurassic Period (approximately 201 to 145 million years ago). This specimen was sourced from the famous fossil beds of Dorset, UK, part of England's renowned Jurassic Coast.

Geology & Origin:

The Jurassic Coast of Dorset is a UNESCO World Heritage Site, known globally for its rich fossil record and accessible sedimentary layers. During the Jurassic, this area was submerged under a warm shallow sea, ideal for marine organisms such as echinoids. As these creatures died, they were quickly buried under sediment and fossilized in exceptional detail. The result is a rare and scientifically valuable fossil like this specimen of Pygaster.

Fossil Type & Species:

Type: Fossil Echinoid (Regular Sea Urchin)

Genus: Pygaster

Preservation: Very good, with detailed test and surface features

Features:

100% genuine, natural fossil specimen

Includes a Certificate of Authenticity

Hand-selected for display quality and geological importance

The exact fossil pictured is the one you will receive

Scale cube = 1cm: See photo for accurate sizing

Why Buy From Us? We provide only authentic, professionally prepared fossils that are carefully sourced and selected. Every specimen is accompanied by a Certificate of Authenticity, giving you complete peace of mind.

Ideal for collectors, educators, natural history enthusiasts, or as a unique decor piece that brings Earth’s ancient marine world into your space.

[uk-fossils]

CLYPEUS MULLERI Fossil Echinoid Sea Urchin Jurassic Inferior Oolite Wiltshire UK Authentic Specimen

This listing features a beautifully preserved fossil echinoid (sea urchin) of the species Clypeus mulleri, discovered in the Inferior Oolite Formation of Wiltshire, UK. This authentic Jurassic marine fossil is accompanied by a Certificate of Authenticity, and the photograph shows the actual specimen you will receive.

Clypeus mulleri is a well-known echinoid species from the Middle Jurassic and is part of the:

Order: Clypeasteroida

Family: Clypeidae

This echinoid lived during the Bajocian Stage of the Middle Jurassic Period, around 170–168 million years ago. The Inferior Oolite represents shallow marine environments, including oolitic and bioclastic limestones deposited in a warm, tropical sea.

Fossils from the oolite beds of Wiltshire are prized for their fine preservation and historical importance, with Clypeus mulleri being among the most characteristic species.

Morphological Features:

Large, rounded disc-shaped test with a slight central elevation

Petaloid ambulacra forming a five-petaled pattern on the upper surface

Fine radial symmetry with a smooth or lightly ornamented surface

Central peristome (mouth area) on the underside, typical of regular echinoids

These echinoids likely lived on or slightly buried in the sea floor, using tube feet for feeding and respiration.

Specimen Details:

Species: Clypeus mulleri

Fossil Type: Echinoid (Sea Urchin) Test

Geological Unit: Inferior Oolite Formation

Geological Age: Middle Jurassic (Bajocian Stage)

Location: Wiltshire, United Kingdom

Depositional Environment: Shallow warm marine platform (oolitic limestone)

Family: Clypeidae

This is a genuine and attractive example of a classic British Jurassic echinoid, perfect for fossil collectors, educators, or natural history enthusiasts.

Scale rule squares/cube = 1cm. Please see the photo for full sizing and details.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

[uk-fossils]

Micraster cortestudinarium Fossil Echinoid Sea Urchin, Upper Chalk, Cretaceous Kent UK | Authentic Specimen + COA

Micraster cortestudinarium Fossil Echinoid – Upper Chalk, Late Cretaceous, Kent, United Kingdom

This beautifully preserved fossil sea urchin is a specimen of Micraster cortestudinarium, one of the most iconic echinoids of the Late Cretaceous. Collected from the Upper Chalk deposits of Kent, southern England, it dates to the Turonian–Coniacian stages of the Late Cretaceous, approximately 90 to 86 million years ago.

Fossil Type & Classification:

Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)

Species: Micraster cortestudinarium

Phylum: Echinodermata

Class: Echinoidea

Order: Spatangoida

Superfamily: Spatangoidea

Family: Holasteridae

Genus: Micraster

Described by: Goldfuss, 1826 (genus authority)

Geological & Stratigraphic Details:

Location: Kent, United Kingdom

Formation: Upper Chalk Formation

Geological Stage: Turonian–Coniacian, Late Cretaceous

Age: ~90–86 million years ago

Biozone: Micraster cortestudinarium Biozone – named after this species and commonly used in European chalk stratigraphy

Depositional Environment: Warm, shallow marine shelf with low sedimentation rates and high calcium carbonate content, perfect for preserving echinoderm fossils in fine chalk matrix

Morphology & Features: This Micraster cortestudinarium specimen exhibits:

Heart-shaped, domed test with symmetrical bilateral profile

Well-defined ambulacra and petaloid pattern on the upper surface

Distinct anterior groove and central apical system

Fine surface granulation and pore rows visible depending on preservation

Preserved in light grey to creamy white chalk matrix, typical of Upper Cretaceous marine deposits

Notable: Micraster is one of the most important and widely distributed echinoid genera of the Upper Cretaceous. The species M. cortestudinarium serves as a key biostratigraphic marker for the British and European chalk and is frequently used in educational and museum contexts for illustrating Cretaceous sea life. Its abundance and diversity reflect significant evolutionary adaptations during the Cretaceous marine radiation.

Specimen Details:

Origin: Kent, UK

Species: Micraster cortestudinarium

Fossil Type: Regular Echinoid (Sea Urchin Test)

Geological Stage: Turonian–Coniacian, Late Cretaceous

Formation: Upper Chalk

Size Reference: Scale cube = 1cm (please refer to listing photos for exact dimensions)

Note: The exact fossil shown in the listing photo is the one you will receive

Authenticity & Quality: This fossil is 100% genuine, professionally sourced and naturally preserved. It includes a Certificate of Authenticity and has not been artificially enhanced.

Why Choose This Fossil? Excellent for:

Echinoid fossil collectors

Educational fossil displays and teaching

British Cretaceous marine collections

Natural history gifts and décor

Shipping & Packaging: Fossils are packed with eco-conscious materials and shipped with full tracking. Every item is handled carefully to ensure it arrives safely.

Bring home a genuine piece of Britain’s ancient sea life with this authentic Micraster cortestudinarium echinoid fossil from the Upper Chalk of Kent.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.