#echinoid fossil shell and spines

[uk-fossils]

Acrosalenia hemicidaroides Echinoid Fossil + Spines, Bajocian Stage, Jurassic France | Rare Authentic Specimen + COA

Acrosalenia hemicidaroides Echinoid Fossil with Spines – Bajocian Stage, Middle Jurassic, Neufchâteau, France

This exceptionally rare fossil specimen features a beautifully preserved Acrosalenia hemicidaroides echinoid, complete with fossilised spines, from the Bajocian stage of the Middle Jurassic, approximately 170 to 168 million years ago. It was discovered in the renowned marine fossil deposits of Neufchâteau, northeastern France.

Fossil Type & Species:

Type: Invertebrate Fossil (Echinoid/Sea Urchin + Detached Spines)

Species: Acrosalenia hemicidaroides

Phylum: Echinodermata

Class: Echinoidea

Order: Cidaroida

Family: Hemicidaridae

Described by: d'Orbigny, 1850 (species known since the mid-19th century)

Geological & Stratigraphic Details:

Location: Neufchâteau, Vosges, France

Formation: Bajocian marine limestone/marl layers

Geological Stage: Bajocian, Middle Jurassic

Age: ~170–168 million years ago

Depositional Environment: Shallow marine carbonate platform, ideal for echinoderm preservation due to low-energy sedimentation and early calcite mineralisation

Biozone: Bajocian ammonite biozones (exact echinoid zonation not formally assigned)

Morphology & Features: This fossil displays key traits of Acrosalenia hemicidaroides:

Spherical to sub-hemispherical test (shell) with intricate tubercle patterns

Thick, robust primary spines, often found detached and fossilised alongside the test

Ambulacral plating in orderly radial arrangement with fine granulation

Distinct oral and aboral surfaces, sometimes visible in partially exposed or prepared examples

Colour ranges from pale grey to light brown due to local matrix mineralisation

Notable: This species is a classic example of Jurassic cidaroid echinoids and is rarely found with spines preserved in association. The presence of spines makes this a scientifically significant and highly aesthetic specimen, ideal for both collectors and educators.

Specimen Details:

Origin: Neufchâteau, France

Species: Acrosalenia hemicidaroides

Fossil Type: Echinoid (Sea Urchin) Test and Spines

Geological Stage: Bajocian, Middle Jurassic

Size Reference: Scale rule square = 1cm (see listing photos for accurate sizing)

Note: The specimen pictured is the exact item you will receive

Authenticity & Quality: All our fossils are guaranteed genuine and carefully selected. This piece includes a Certificate of Authenticity and has not been restored or enhanced.

Why Choose This Fossil? An ideal specimen for:

Serious fossil collectors and echinoderm enthusiasts

Museum or university-level palaeontology displays

Decorative fossil showcases

Education in marine palaeobiology and Jurassic ecosystems

Shipping & Packaging: All items are professionally packed with eco-conscious materials and shipped via tracked services for safe delivery.

Add a stunning piece of Jurassic marine life to your collection with this rare Acrosalenia hemicidaroides echinoid fossil complete with spines from Neufchâteau, France.

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

[echinoid-fossils-on-the-rocks]

Repost from April 07.2024

Found on this afternoon fossil hunt, these pieces and this rock with the tiny brown echinoid in it. Now 3 bigger rocks with echinoid in it. I reblog the next post with this piece.

Some of the new fragments of flint with the sea urchin outer shell, spine imprints in contrast to each. Often are barely to see only on one or a line segment on the surface from the original fossil.

These molds are only piece from the laying of the previous part of the sediment, in which the fossil was embedet.

Only one - two dot of the once spine mold from the previous liening. Resembles an little like octopode sucker nubs.

The half flat one please to zoom to see the little surface strucktures of the print.

[uk-fossils]

Phymosoma magnificum Regular Echinoid Fossil, Campanian Stage, Cretaceous France | Authentic Specimen + COA

Phymosoma magnificum Regular Echinoid Fossil – Campanian Stage, Late Cretaceous, Talmont, Charente-Maritime, France

This striking fossil is a beautifully preserved specimen of Phymosoma magnificum, a regular echinoid (sea urchin) from the Campanian stage of the Late Cretaceous, approximately 83.6 to 72.1 million years ago. It was collected from the marine limestone beds around Talmont, located in the Charente-Maritime department of southwestern France—an area renowned for producing finely preserved Cretaceous invertebrate fossils.

Fossil Type & Species:

Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)

Species: Phymosoma magnificum

Phylum: Echinodermata

Class: Echinoidea

Order: Phymosomatoida (or Cidaroida, classification varies)

Family: Phymosomatidae

Described by: Agassiz, mid-19th century (genus authority)

Geological & Stratigraphic Details:

Location: Talmont-sur-Gironde, Charente-Maritime, France

Formation: Campanian marine chalk and marl beds

Geological Stage: Campanian (Late Cretaceous)

Age: ~83.6–72.1 million years ago

Biozone: Campanian echinoid-rich strata (specific subzone unassigned)

Depositional Environment: Shallow marine carbonate platform with quiet depositional conditions ideal for fossilisation of echinoderms and other invertebrates

Morphology & Features: This Phymosoma magnificum fossil displays:

Thick, rounded test (shell) with a symmetrical and slightly flattened shape

Prominent primary tubercles used for spine attachment, arranged in radiating rows

Deeply impressed ambulacral zones giving the shell a distinct petaloid appearance

Natural preservation in hues of beige, light brown, or pale grey

Often displays partial or associated spines and well-defined plate ornamentation

Notable: Phymosoma magnificum is one of the more ornate and well-known Cretaceous echinoid species from France. Its robust test, deeply impressed features, and balanced form make it both scientifically valuable and aesthetically striking. These fossils are often found in collections and museum exhibits focusing on Mesozoic marine invertebrates.

Specimen Details:

Origin: Talmont, Charente-Maritime, France

Species: Phymosoma magnificum

Fossil Type: Regular Echinoid / Sea Urchin Shell

Geological Stage: Campanian, Late Cretaceous

Size Reference: Scale rule square = 1cm (see listing photo for exact dimensions)

Note: You will receive the exact fossil specimen pictured

Authenticity & Quality: This fossil is 100% genuine, professionally verified, and selected for its completeness and natural appeal. It includes a Certificate of Authenticity. No restorations or enhancements applied.

Why Choose This Fossil? A perfect piece for:

Collectors of echinoids and Cretaceous fossils

Educational displays on marine palaeontology

Decorative natural history exhibits

Unique gifts for fossil enthusiasts and geologists

Shipping & Packaging: We use eco-conscious packaging and ship with full tracking and protection. Each fossil is carefully wrapped to ensure safe delivery.

Add an elegant and scientifically significant Cretaceous sea urchin to your collection with this stunning Phymosoma magnificum fossil from Talmont, France.

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

[uk-fossils]

Phymosoma magnificum Regular Echinoid Fossil, Campanian Stage, Cretaceous France | Authentic Specimen + COA

Phymosoma magnificum Regular Echinoid Fossil – Campanian Stage, Late Cretaceous, Talmont, Charente-Maritime, France

This striking fossil is a beautifully preserved specimen of Phymosoma magnificum, a regular echinoid (sea urchin) from the Campanian stage of the Late Cretaceous, approximately 83.6 to 72.1 million years ago. It was collected from the marine limestone beds around Talmont, located in the Charente-Maritime department of southwestern France—an area renowned for producing finely preserved Cretaceous invertebrate fossils.

Fossil Type & Species:

Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)

Species: Phymosoma magnificum

Phylum: Echinodermata

Class: Echinoidea

Order: Phymosomatoida (or Cidaroida, classification varies)

Family: Phymosomatidae

Described by: Agassiz, mid-19th century (genus authority)

Geological & Stratigraphic Details:

Location: Talmont-sur-Gironde, Charente-Maritime, France

Formation: Campanian marine chalk and marl beds

Geological Stage: Campanian (Late Cretaceous)

Age: ~83.6–72.1 million years ago

Biozone: Campanian echinoid-rich strata (specific subzone unassigned)

Depositional Environment: Shallow marine carbonate platform with quiet depositional conditions ideal for fossilisation of echinoderms and other invertebrates

Morphology & Features: This Phymosoma magnificum fossil displays:

Thick, rounded test (shell) with a symmetrical and slightly flattened shape

Prominent primary tubercles used for spine attachment, arranged in radiating rows

Deeply impressed ambulacral zones giving the shell a distinct petaloid appearance

Natural preservation in hues of beige, light brown, or pale grey

Often displays partial or associated spines and well-defined plate ornamentation

Notable: Phymosoma magnificum is one of the more ornate and well-known Cretaceous echinoid species from France. Its robust test, deeply impressed features, and balanced form make it both scientifically valuable and aesthetically striking. These fossils are often found in collections and museum exhibits focusing on Mesozoic marine invertebrates.

Specimen Details:

Origin: Talmont, Charente-Maritime, France

Species: Phymosoma magnificum

Fossil Type: Regular Echinoid / Sea Urchin Shell

Geological Stage: Campanian, Late Cretaceous

Size Reference: Scale rule square = 1cm (see listing photo for exact dimensions)

Note: You will receive the exact fossil specimen pictured

Authenticity & Quality: This fossil is 100% genuine, professionally verified, and selected for its completeness and natural appeal. It includes a Certificate of Authenticity. No restorations or enhancements applied.

Why Choose This Fossil? A perfect piece for:

Collectors of echinoids and Cretaceous fossils

Educational displays on marine palaeontology

Decorative natural history exhibits

Unique gifts for fossil enthusiasts and geologists

Shipping & Packaging: We use eco-conscious packaging and ship with full tracking and protection. Each fossil is carefully wrapped to ensure safe delivery.

Add an elegant and scientifically significant Cretaceous sea urchin to your collection with this stunning Phymosoma magnificum fossil from Talmont, France.

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

[uk-fossils]

Phymosoma magnificum Regular Echinoid Fossil, Campanian Stage, Cretaceous France | Authentic Specimen + COA

Phymosoma magnificum Regular Echinoid Fossil – Campanian Stage, Late Cretaceous, Talmont, Charente-Maritime, France

This striking fossil is a beautifully preserved specimen of Phymosoma magnificum, a regular echinoid (sea urchin) from the Campanian stage of the Late Cretaceous, approximately 83.6 to 72.1 million years ago. It was collected from the marine limestone beds around Talmont, located in the Charente-Maritime department of southwestern France—an area renowned for producing finely preserved Cretaceous invertebrate fossils.

Fossil Type & Species:

Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)

Species: Phymosoma magnificum

Phylum: Echinodermata

Class: Echinoidea

Order: Phymosomatoida (or Cidaroida, classification varies)

Family: Phymosomatidae

Described by: Agassiz, mid-19th century (genus authority)

Geological & Stratigraphic Details:

Location: Talmont-sur-Gironde, Charente-Maritime, France

Formation: Campanian marine chalk and marl beds

Geological Stage: Campanian (Late Cretaceous)

Age: ~83.6–72.1 million years ago

Biozone: Campanian echinoid-rich strata (specific subzone unassigned)

Depositional Environment: Shallow marine carbonate platform with quiet depositional conditions ideal for fossilisation of echinoderms and other invertebrates

Morphology & Features: This Phymosoma magnificum fossil displays:

Thick, rounded test (shell) with a symmetrical and slightly flattened shape

Prominent primary tubercles used for spine attachment, arranged in radiating rows

Deeply impressed ambulacral zones giving the shell a distinct petaloid appearance

Natural preservation in hues of beige, light brown, or pale grey

Often displays partial or associated spines and well-defined plate ornamentation

Notable: Phymosoma magnificum is one of the more ornate and well-known Cretaceous echinoid species from France. Its robust test, deeply impressed features, and balanced form make it both scientifically valuable and aesthetically striking. These fossils are often found in collections and museum exhibits focusing on Mesozoic marine invertebrates.

Specimen Details:

Origin: Talmont, Charente-Maritime, France

Species: Phymosoma magnificum

Fossil Type: Regular Echinoid / Sea Urchin Shell

Geological Stage: Campanian, Late Cretaceous

Size Reference: Scale rule square = 1cm (see listing photo for exact dimensions)

Note: You will receive the exact fossil specimen pictured

Authenticity & Quality: This fossil is 100% genuine, professionally verified, and selected for its completeness and natural appeal. It includes a Certificate of Authenticity. No restorations or enhancements applied.

Why Choose This Fossil? A perfect piece for:

Collectors of echinoids and Cretaceous fossils

Educational displays on marine palaeontology

Decorative natural history exhibits

Unique gifts for fossil enthusiasts and geologists

Shipping & Packaging: We use eco-conscious packaging and ship with full tracking and protection. Each fossil is carefully wrapped to ensure safe delivery.

Add an elegant and scientifically significant Cretaceous sea urchin to your collection with this stunning Phymosoma magnificum fossil from Talmont, France.

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

[uk-fossils]

Phymosoma magnificum Regular Echinoid Fossil, Campanian Stage, Cretaceous France | Authentic Specimen + COA

Phymosoma magnificum Regular Echinoid Fossil – Campanian Stage, Late Cretaceous, Talmont, Charente-Maritime, France

This striking fossil is a beautifully preserved specimen of Phymosoma magnificum, a regular echinoid (sea urchin) from the Campanian stage of the Late Cretaceous, approximately 83.6 to 72.1 million years ago. It was collected from the marine limestone beds around Talmont, located in the Charente-Maritime department of southwestern France—an area renowned for producing finely preserved Cretaceous invertebrate fossils.

Fossil Type & Species:

Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)

Species: Phymosoma magnificum

Phylum: Echinodermata

Class: Echinoidea

Order: Phymosomatoida (or Cidaroida, classification varies)

Family: Phymosomatidae

Described by: Agassiz, mid-19th century (genus authority)

Geological & Stratigraphic Details:

Location: Talmont-sur-Gironde, Charente-Maritime, France

Formation: Campanian marine chalk and marl beds

Geological Stage: Campanian (Late Cretaceous)

Age: ~83.6–72.1 million years ago

Biozone: Campanian echinoid-rich strata (specific subzone unassigned)

Depositional Environment: Shallow marine carbonate platform with quiet depositional conditions ideal for fossilisation of echinoderms and other invertebrates

Morphology & Features: This Phymosoma magnificum fossil displays:

Thick, rounded test (shell) with a symmetrical and slightly flattened shape

Prominent primary tubercles used for spine attachment, arranged in radiating rows

Deeply impressed ambulacral zones giving the shell a distinct petaloid appearance

Natural preservation in hues of beige, light brown, or pale grey

Often displays partial or associated spines and well-defined plate ornamentation

Notable: Phymosoma magnificum is one of the more ornate and well-known Cretaceous echinoid species from France. Its robust test, deeply impressed features, and balanced form make it both scientifically valuable and aesthetically striking. These fossils are often found in collections and museum exhibits focusing on Mesozoic marine invertebrates.

Specimen Details:

Origin: Talmont, Charente-Maritime, France

Species: Phymosoma magnificum

Fossil Type: Regular Echinoid / Sea Urchin Shell

Geological Stage: Campanian, Late Cretaceous

Size Reference: Scale rule square = 1cm (see listing photo for exact dimensions)

Note: You will receive the exact fossil specimen pictured

Authenticity & Quality: This fossil is 100% genuine, professionally verified, and selected for its completeness and natural appeal. It includes a Certificate of Authenticity. No restorations or enhancements applied.

Why Choose This Fossil? A perfect piece for:

Collectors of echinoids and Cretaceous fossils

Educational displays on marine palaeontology

Decorative natural history exhibits

Unique gifts for fossil enthusiasts and geologists

Shipping & Packaging: We use eco-conscious packaging and ship with full tracking and protection. Each fossil is carefully wrapped to ensure safe delivery.

Add an elegant and scientifically significant Cretaceous sea urchin to your collection with this stunning Phymosoma magnificum fossil from Talmont, France.

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

[uk-fossils]

Pseudodiadema depressum Regular Echinoid Fossil, Oxfordian Stage, Jurassic France | Authentic Specimen + COA

Pseudodiadema depressum Regular Echinoid Fossil – Oxfordian Stage, Late Jurassic, Cricqueboeuf, Normandy, France

This fine fossil specimen represents Pseudodiadema depressum, a regular echinoid (sea urchin) from the Oxfordian stage of the Late Jurassic, approximately 159 to 154 million years ago. It was recovered from the fossil-rich marine limestone beds of Cricqueboeuf, a renowned site in Normandy, northern France.

Fossil Type & Species:

Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)

Species: Pseudodiadema depressum

Phylum: Echinodermata

Class: Echinoidea

Order: Cidaroida

Superfamily: Pseudodiadematoidea

Family: Pseudodiadematidae

Described by: Cotteau, 1863

Geological & Stratigraphic Details:

Location: Cricqueboeuf, Calvados, Normandy, France

Formation: Oxfordian marine limestones

Geological Stage: Oxfordian (Upper Jurassic)

Age: ~159–154 million years ago

Biozone: Perisphinctes ammonite zone (regional correlation)

Depositional Environment: Shallow marine carbonate platform with calm, warm seas; ideal for the preservation of delicate echinoid shells in fine-grained limestones

Morphology & Features: This Pseudodiadema depressum specimen features:

Sub-hemispherical, symmetrical test with clear ambital outline

Densely arranged primary and secondary tubercles forming a detailed lattice across the shell

Well-developed ambulacral and interambulacral zones, sometimes showing fine pore structures

No spines attached, but tubercle structure suggests strong spine-bearing capability

Subtle colour variations from beige to pale brown, depending on matrix contact

Notable: Pseudodiadema depressum is a classic species of Jurassic echinoid used in palaeoenvironmental and biostratigraphic studies. Its compact test and distinctive tubercle patterning make it both scientifically important and visually appealing.

Specimen Details:

Origin: Cricqueboeuf, Normandy, France

Species: Pseudodiadema depressum

Fossil Type: Echinoid Shell (Regular Sea Urchin)

Geological Stage: Oxfordian, Late Jurassic

Size Reference: Scale rule square = 1cm (please refer to the listing photo for full size)

Note: You will receive the exact specimen shown in the photographs

Authenticity & Quality: All our fossils are genuine and professionally selected. This specimen includes a Certificate of Authenticity. No restorations or artificial enhancements are applied.

Why Choose This Fossil? Perfect for:

Fossil and echinoderm collectors

Academic and educational purposes

Natural history displays

Unique gifts with palaeontological value

Shipping & Packaging: Eco-conscious packaging and tracked global shipping ensure secure and swift delivery. Each fossil is packed with care to preserve detail and structure.

Own a finely preserved sea urchin from the Jurassic oceans of France with this authentic Pseudodiadema depressum echinoid fossil.

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

[uk-fossils]

Circopeltis baicheri Regular Echinoid Fossil, Ypresian Stage, Eocene France | Authentic Specimen + COA

CIRCOpeltis baicheri Regular Echinoid Fossil – Ypresian Stage, Early Eocene, Antugnac, France

This well-preserved fossil specimen is a rare Circopeltis baicheri, a regular echinoid (sea urchin) that lived during the Ypresian stage of the Early Eocene, approximately 56 to 47.8 million years ago. Found in the renowned marine fossil beds of Antugnac, southern France, this specimen exemplifies the morphological diversity and beauty of post-Paleocene echinoids.

Fossil Type & Species:

Type: Invertebrate Fossil (Regular Echinoid/Sea Urchin)

Species: Circopeltis baicheri

Phylum: Echinodermata

Class: Echinoidea

Order: Cidaroida (tentative placement)

Family: Cidaridae or related regular echinoid lineage

Described by: (Exact authority not formally cited; likely post-WWII paleontological records in European literature)

Geological & Stratigraphic Details:

Location: Antugnac, Aude, Occitanie, France

Formation: Ypresian marine marl and limestone beds

Geological Stage: Ypresian (Early Eocene)

Age: ~56–47.8 million years ago

Depositional Environment: Warm, shallow marine environment with carbonate-rich mud and fine sediment ideal for the preservation of echinoids

Biozone: Not specifically assigned; part of the broader Eocene echinoid-bearing beds of southern France

Morphology & Features: This Circopeltis baicheri specimen is noted for:

Symmetrical, globular to slightly flattened test (sea urchin shell)

Five distinct ambulacral zones with regularly spaced tubercles

No visible spines attached, though tubercle positions are preserved

Test diameter and surface ornamentation consistent with regular echinoid structure

Preserved in light beige to grey tones, sometimes with original sediment matrix attached

Notable: Circopeltis is a lesser-known but scientifically relevant genus of regular echinoids from the Eocene of France. Specimens like baicheri are rarely seen outside academic collections. Their presence helps define biodiversity recovery and reef evolution in the early Paleogene after the K-Pg mass extinction.

Specimen Details:

Origin: Antugnac, France

Species: Circopeltis baicheri

Fossil Type: Echinoid Shell (Regular Sea Urchin)

Geological Stage: Ypresian, Early Eocene

Size Reference: Scale rule square = 1cm (see photo for exact size)

Note: You will receive the exact specimen shown in the photograph

Authenticity & Quality: This fossil is professionally verified and 100% genuine. It comes with a Certificate of Authenticity. No restoration, casting, or enhancement has been applied.

Why Choose This Fossil? Ideal for:

Fossil collectors and echinoderm enthusiasts

Educational and teaching displays

Early Paleogene marine life studies

Decorative fossil art with scientific value

Shipping & Packaging: Fast, tracked shipping with secure, eco-conscious packaging. Each fossil is handled with expert care to ensure safe delivery.

Add a scientifically significant and visually elegant Circopeltis baicheri echinoid fossil to your collection from the beautiful marine beds of Antugnac, France.

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

[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.