What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Fossils reveal that early relatives of starfish had a more varied mix of features than modern starfish do. A 480-million-year-old fossil from Morocco combines starfish-like arms and food grooves with feathery appendages, while a 518-million-year-old fossil from China offers clues about the much broader ancestry shared by starfish and acorn worms. Neither fossil proves a direct line of descent to living starfish, and neither explains why modern starfish typically have five arms.
How did starfish evolve?
Starfish, also called sea stars, belong to the echinoderms, a group that also includes sea urchins, brittle stars, sea cucumbers and crinoids such as sea lilies. Their evolutionary history is not a simple sequence in which one known fossil can be identified as the direct ancestor of all living starfish. Instead, fossils preserve different early body forms and help researchers test where those forms fit on the evolutionary tree.
Two fossils reported in recent years illuminate different parts of that story. Cantabrigiaster fezouataensis is relevant to early echinoderm forms with starfish-like features. Yujingia glutenotunica is relevant to the ancestry of ambulacrarians, the larger group that includes echinoderms and hemichordates, such as acorn worms. These are related but distinct questions: evidence about the shared ancestor of ambulacrarians is not, by itself, evidence identifying the ancestor of starfish alone.
What does the 480-million-year-old Cantabrigiaster fossil show?
New Atlas reported in 2021 that Cantabrigiaster fezouataensis, found in Morocco’s Anti-Atlas region, dates to roughly 480 million years ago. Its described anatomy includes starfish-like arms and a food groove running along each arm, as well as feathery appendages compared with the filtering structures of sea lilies. The combination makes it a distinctive early echinoderm form, rather than a modern starfish preserved unchanged.
#1 Best Overall
- Fossil replica of a Mesozoic echinoderm measuring approximately 4cm (1.25")
- Sturdy fossil replica made from resin is designed to last through heavy classroom and laboratory use
- This echinoderm is related to the sea urchins and starfish of today
- Perfect for use in the classroom during lessons on fossils and paleontology
- hough the echinoderm's durable test, or shell, is often preserved, the more fragile spines are rarely preserved
The 2021 report says the animal lacked about 60 percent of a modern starfish’s body plan. That figure underscores how different its overall anatomy was, even though some features resemble those of starfish. Its mixture of traits can help researchers consider how features associated with later echinoderm groups appeared among early forms. The fossil does not establish a complete chain of descent or show that Cantabrigiaster was a direct ancestor of living starfish. (New Atlas, 2021)
What does the older Yujingia fossil add?
A University of Cambridge report dated September 16, 2026, describes Yujingia glutenotunica fossils from southwestern China, dated to 518 million years ago. The report says they preserve the animal’s body, gut and appendages despite its lack of a mineralized skeleton. Researchers interpret one set of appendages as feather-like tentacles used to capture organic particles; another set may have helped anchor the animal temporarily to the seafloor.
Rank #2
- Feature: It is real, nature and authentic. Not fake or man-made.
- Size: It is variation 5cm - 8cm. Send by random.
- Note: Coz it is real fossil, each will be slightly different in shape, color, and size. Send by random.
- From: It is from the Hunan Province of China. Time: 450 million years ago silurian period.
- Gift: Memorable gift to friend, kids or family.
The Cambridge account describes a phylogenetic analysis of 505 morphological characters across 100 living and extinct taxa. That analysis places Yujingia closer to the last common ancestor of living ambulacrarians than previously described fossils. The placement offers evidence about early ambulacrarian anatomy and feeding, not proof that Yujingia directly gave rise to modern starfish.
As co-author Dr Giovanni Mussini put it in the Cambridge report, researchers had tended to picture the last common ancestor of ambulacrarians as a worm-like animal living in a seafloor burrow and filtering food from the water. He said the fossil suggests that this ancestor might instead have fed with tentacles and been more like starfish and their relatives. This is an interpretation of the fossil’s anatomy and its position in the analysis, not a direct observation of the ancient ancestor itself. (University of Cambridge, 2026)
Rank #3
- DINO-MITE REPLICAS: Master Replicas Groups presents prehistoric fossil replicas, realistic sculptures created by MRG paleo artists, using artistic interpretation based on current scientific data.
- MADE IN THE USA: Made by artisans in the U.S.A. Cast in super-durable resin, NOT polystone.
- DIMENSIONS: Measures 5 x 2.5 x 0.25 inches.
- GREAT GIFT IDEA: Purchase this replica for yourself or gift it to the prehistoric lover in your life!
How do the two fossils inform different questions?
| Fossil | Reported age and locality | Evidence described | Evolutionary question it informs |
|---|---|---|---|
| Cantabrigiaster fezouataensis | Roughly 480 million years old; Morocco’s Anti-Atlas region (New Atlas, 2021) | Starfish-like arms and food grooves, plus feathery appendages compared with sea-lily filtering structures; reported to lack about 60 percent of a modern starfish’s body plan (New Atlas, 2021) | Early echinoderm forms and combinations of traits relevant to starfish-like animals |
| Yujingia glutenotunica | 518 million years old; southwestern China (University of Cambridge, 2026) | Body, gut and appendages preserved without a mineralized skeleton; tentacle-like feeding and temporary anchoring are researchers’ interpretations (University of Cambridge, 2026) | The broader ancestry and possible feeding biology of ambulacrarians, the group that includes echinoderms and hemichordates |
The fossils should not be ranked as competing answers to “where did starfish come from?” Their reported evidence bears on different branches and levels of the evolutionary story. The Cantabrigiaster report concerns an early echinoderm form with starfish-like features; the Yujingia analysis concerns a much broader shared ancestry.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the oldest starfish fossil?
These reports do not establish either fossil as the oldest starfish fossil. Cantabrigiaster is described as an early echinoderm with some starfish-like features, not as a modern starfish. Yujingia is discussed in relation to ambulacrarian ancestry, a group broader than starfish. Their ages make them relevant to the history of the group, but age alone does not make either animal a starfish or prove direct ancestry.
Rank #4
![Sperm Whale Tooth Resin Replica - Realistic Fossil Decor for Home, Classroom & Collection [RS-8128]](https://m.media-amazon.com/images/I/51E0DsOOWUL._SL160_.jpg)
- LIFELIKE WHALE TOOTH REPLICA: Expertly crafted Sperm Whale Tooth made from premium resin with rea...
- ELEGANT DISPLAY STAND: Includes a sturdy metal and wood stand that showcases the tooth beautifull...
- PREMIUM QUALITY MATERIALS: Made from durable, non-toxic resin with a smooth, hand-painted finish ...
- NAUTICAL & EDUCATIONAL DECOR: Ideal for ocean-themed rooms, classrooms, museums, or marine biolog...
- UNIQUE GIFT IDEA: A memorable present for whale lovers, maritime collectors, nautical decor fans,...
Why do starfish have five arms?
The fossils described here do not answer why modern starfish developed five arms. In the 2021 report, lead scientist Dr Aaron Hunter said: “One thing we hope to answer in the future is why starfish developed their five arms. It seems to be a stable shape for them to adopt – but we don’t yet know why.” The fossil record discussed in these reports helps illuminate early forms and relationships, but leaves this question open. (New Atlas, 2021)
What fossils can—and cannot—tell us about starfish origins
- They preserve anatomy: features such as arm grooves, appendages, body outlines and guts can be compared across fossils and living animals.
- They help test evolutionary relationships: researchers use anatomical characters and phylogenetic analyses to estimate how extinct forms relate to living groups.
- They do not automatically identify direct ancestors: a fossil can be close to an ancestral group or share relevant traits without being the actual ancestor of a living species.
- Different fossils answer different questions: evidence about early echinoderms is not interchangeable with evidence about the broader ambulacrarian ancestor.
The reports discussed here are university and science-news accounts of fossil studies, rather than the original journal papers. Their descriptions support a careful account of what the fossils show and how researchers interpret them, but not a claim that either one settles the precise origin of modern starfish.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
