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uk-fossils · 1 month ago

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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.

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borealopelta · 3 years ago

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Please tell me about your favourite dinosaur and/or rock!

HIII okay so. My favourite dinosaur is Carnotaurus sastrei, who has been vilified to hell and back in Dino Media for being a carnivore i guess?? they're so cute they have little horns and the weakest most pathetic arms in existence. i'm also incredibly fond of Mochlodon vörösi, which is a Rhabdodontid dinosaur from Hungary and i actually know the guy it was named after which is pretty dope.

My favourite rock is, to be Super basic about it, basalt. It's pretty, it's simple, it's everywhere and it has thee dopest aphanitic texture (they actually thought it was a mineral for a bit back in the day! before they started using microscopes in petrology which helped them figure out the mineral composition) AND if i also picked a favourite sedimentary rock it would be the Leitha Limestone Formation which is a Central European (Pannonian Sea area) formation from the Badenian (Miocene). It's a shallow sea environment with TONS of fossils in there, like, an insane amount of molluscs, echinoderms, lophophorates, algae, sharks etc it's like an amateur collector's heaven in there you can find So Much Stuff

#thanks for this i love to think abt school!!!!!#went back to my favourite field trip location with the first years two months ago. so much leitha fm there i got so much shit #anonymous #asked and answered #geologyblr

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earthstory · 8 years ago

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Pretty as a flower

Crinoids, or sea lilies, resemble flowers, however, they are not plants. Crinoids are marine animals that are related to starfish, brittle stars and other echinoderms. These critters can be found both in shallow waters and at great depths of around 9,000 meters.

These critters are plankton eaters and they have muscles, a gut, a nervous and reproductive systems and some other features of advanced animals that you would not expect to see in an animal that looks more like a plant.

Crinoids have pentaradial symmetry, which is typical from echinoderms. These animals present three main sections: stem (or column), calyx (where the body cavity and digestion takes place) and the arms (which are responsible to filter food). Most of the species live attached to the seabed, but there are some free-swimming species. Early crinoids from the Paleozoic were completely immobile. Mobility is a feature that only appeared later, since crinoids were vulnerable to predators and they had to adapt.

These creatures have been present on Earth since the Ordovician period (roughly 490 million years ago) and they still exist to this day, which shows how successful they are. Crinoids not only survived the Permian and the Cretaceous-Tertiary mass extinction events, but they also were able to diversify and proliferate into hundreds of species, many of them still alive today (around 625 species).

Due to its beauty, crinoid fossils are quite desired by collectors. A good thing is that these animals are common fossils, however, notice that wholly preserved crinoids (with stem, calyx and arms) are a rare finding. This happens because the plates of the animal’s skeleton fall apart when ligaments and muscles decompose after death. Crinoids that underwent a quick burial are the ones with the best chances of producing a complete fossil and they are quite esteemed by paleontologists for the scientific value and by collectors due to its aesthetic.

The calyces of crinoids are a common find if you look for them in Paleozoic sedimentary rocks that present noticeable crinoid columnals, however, if you do not see these, then it is not likely for you to find any calyces. In my case, I would definitely need the help of a professional, and if that is your situation as well, you should reach a paleontologist from a university or from a natural history museum. At the end of the day, that would surely be a great field trip.

Sources: http://bit.ly/2w0BiY0 http://bit.ly/2vZl7ek

Photo credits: http://bit.ly/2wEbqiq - photo by Vassil http://bit.ly/2vPgzXf - photo by Alexander Vasenin http://bit.ly/2uAto4d - photo by Kevinzim/Kevin Walsh http://bit.ly/1Zh8SyM - photo by Berengi

#Crinoid #Science #geo #Fossil #Fossilfriday #Calyx #The earth story #echinoderm

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phylojennny · 6 years ago

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Sarah gave a talk titled, ‘Quantitatively assessing gross morphology of holocystitid diploporitans: Blastozoa, Echinodermata’. Long and tricky title. Essentially, a fossil collector in the Cincinnati region - Tom Bantel - found a ton of this very specific kind of fossil called a diploporitan. These fossils were restricted to certain amount of time in the Paleozoic - so about 450-400 million years ago. In the fossil record we think about aging or growth in terms of size. The biggest fossils of a certain species we find is often the adult, meaning everything smaller is a different growth stage. Obviously - this is a HUGE assumption and is not always true. There are other telling signs on ancient echinoderms that help us determine if the fossils are ‘adults’ or not. We essentially go through a check list of assumptions and our understanding of their shape and growth.

Maggie and I used a laser scanner to create 3D models of all of these specimens from Tom. Sarah and (other) Jen could then clean up these models and put a bunch of little points on them with a few as ‘anchors’ or places where we know are the same on each fossil. Then they used morphometric analyses to see if there is a way to quantitatively describe how this animal grew! It was really a fun project with so many different collaborators! I was really glad to be a part of it.

Check out her abstract: QUANTITATIVELY ASSESSING GROSS MORPHOLOGY OF HOLOCYSTITID DIPLOPORITANS (BLASTOZOA: ECHINODERMATA)

Also, Sarah is a new faculty at the University of South Florida - if you like echinoderms and evolution check out her faculty page, she will be looking for new graduate students for Fall 2020: http://hennarot.forest.usf.edu/main/depts/geosci/faculty/ssheffield/

#paleontology #paleobiology #science #scicomm #gsa2018 #conference #morphometrics #echinoderm #ancient #fossils

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uk-fossils · 1 month ago

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