iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Coelacanths are called “living fossils” because living fish in the genus Latimeria were discovered in 1938 after coelacanths were known only from fossils and widely thought to have disappeared. Their broad body plan also resembles much older coelacanth fossils. The phrase is useful shorthand, but it is not a scientific designation and does not mean evolution stopped. Modern coelacanths are distinct species, have evolved over time, and are not the direct ancestors of humans or other land vertebrates.
The discovery that created the “living fossil” legend
Coelacanth fossils were known long before anyone recognized a living specimen. The Muséum de Toulouse describes coelacanth fossils from the Devonian, about 360 million years ago in its account, through the end of the Cretaceous, 66 million years ago. Because no living coelacanth was known, scientists treated the group as extinct.
That changed in December 1938, when Marjorie Courtenay-Latimer, curator of the East London Museum in South Africa, examined an unusual fish among a trawler’s catch. She recognized features unlike those of ordinary modern fishes and contacted ichthyologist J. L. B. Smith. Smith identified it as a coelacanth; the species was formally described in 1939 as Latimeria chalumnae.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
The event was a rediscovery of a living lineage previously known from fossils. It was not evidence that one individual species had remained unchanged for hundreds of millions of years. The living fish belonged to a modern genus, Latimeria, distinct from the fossil genera, even though it retained recognizable coelacanth characteristics.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
A second living species, Latimeria menadoensis, was discovered in Indonesia in the late 1990s and described in 1999. The two species known in the sources are:
| Species | Known range | What it shows |
|---|---|---|
| Latimeria chalumnae | Western Indian Ocean, including waters near the African coast | The species recognized after the 1938 South African discovery |
| Latimeria menadoensis | Indonesia | A separately described living species, not a surviving specimen of an ancient fossil species |
Smithsonian Ocean’s November 2018 reference and the 2013 African coelacanth genome study both emphasize this distinction between living Latimeria and earlier fossil forms.
What “living fossil” means—and what it does not
The expression bundles together several different ideas. In the coelacanth case, it usually points to three observations, but only two are scientifically defensible when carefully qualified.
| Common implication | Accurate interpretation |
|---|---|
| Known from fossils before living examples were found | Accurate. Coelacanth fossils preceded the 1938 discovery of living Latimeria. |
| A broadly conservative body plan | Partly accurate. Fossil studies find low morphological disparity across much of coelacanth history, and modern fish retain several recognizable traits. |
| Evolution stopped or produced an unchanged organism | Inaccurate. Modern species have their own evolutionary history, and genetic as well as anatomical differences accumulated over time. |
“Living fossil” is informal and debated among evolutionary biologists. The 2022 review Why Coelacanths Are Almost ‘Living Fossils’? explains that some researchers avoid the phrase because it can suggest biological stasis. A museum account from Toulouse similarly challenges the idea that a living coelacanth is simply an ancient fossil brought back to life.
A more precise description is: a living member of a lineage with a substantial fossil record, whose broad morphology has changed relatively slowly compared with that of many other groups. “Relatively slowly” is a comparison, not a claim of zero change.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Did coelacanths really stop evolving?
No. Evolution includes changes in genes, anatomy, physiology, behavior and population structure. A lineage can retain a recognizable overall shape while still accumulating many changes that are invisible from a fossil or a casual visual comparison.
Fossil evidence: conservative shape, not perfect sameness
Fossil analyses summarized in the 2022 Frontiers in Ecology and Evolution review describe low morphological disparity across much of coelacanth history. In plain language, major features of the body plan occupy a relatively narrow range compared with groups that diversified into many dramatically different forms.
Recommended Free Tools
The 2013 Nature genome paper says living coelacanth morphology resembles fossils dating back at least 300 million years. That statement concerns overall anatomical similarity. It does not identify a modern Latimeria individual, or even its species, as the same biological entity represented by a Devonian or Paleozoic fossil.
Genetic evidence: some rates are slow, others are not
Molecular evolution is not measured by looking at body shape. Researchers compare DNA sequences and estimate substitution rates—the rate at which one genetic letter is replaced by another over generations.
The African coelacanth genome study reported that coelacanth protein-coding genes evolve significantly more slowly than those of tetrapods, while noting that this pattern did not apply to other genomic features. This is a narrow result about particular sequence categories. It cannot be expanded into “the coelacanth genome does not evolve.”
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
The 2022 review also summarizes evidence for slower substitution rates in some mitochondrial and nuclear measures, especially protein-coding genes, while discussing exceptions and alternative interpretations. Slow molecular evolution may help preserve an overall body plan, but it does not erase mutation, natural selection, genetic drift or adaptation.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWhy a stable body plan can persist
A body plan may remain broadly stable when a lineage occupies an environment in which the existing design continues to work well. That situation is sometimes described as stabilizing selection. It does not prevent change in traits that are less visible, such as immune genes, reproductive biology, sensory systems or physiology.
Coelacanths live in deep marine environments and are difficult to observe directly. Their lobed fins, slow movement and specialized ecology make them unusual, but unusual does not mean outside normal evolutionary processes. The fossil record also has gaps, so apparent stability may partly reflect which traits fossilize and which intervals have been sampled.
How old are living coelacanths?
The lineage is ancient, but a living fish is not hundreds of millions of years old. A modern coelacanth develops from a modern egg, carries DNA inherited through recent generations and belongs to one of two extant Latimeria species.
The fossil record gives a long history for coelacanth relatives. The Toulouse account places known fossils from roughly 360 million years ago to 66 million years ago. The genome paper uses a more specific comparison, noting that living coelacanth morphology is similar to fossils at least 300 million years old. These figures describe the age of fossils and anatomical comparisons, not the age of any individual animal.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
The 2022 review cites estimates from Mahé and colleagues’ 2021 work on growth lines in L. chalumnae. It reports a probable lifespan of about 100 years, earliest sexual maturity around 49–69 years and gestation of approximately five years. These are study estimates, not settled universal values for every coelacanth or both species.
Are coelacanths our ancestors?
No. Coelacanths are lobe-finned fishes and are valuable for studying the transition and diversification of vertebrates, but living coelacanths are not fish halfway through becoming land animals. They are surviving relatives on a separate branch of the lobe-finned fish family tree.
The 2013 genome study used phylogenomics—comparisons across many genes—to examine relationships among coelacanths, lungfish and tetrapods. Its conclusion was that lungfish, not coelacanths, are the closest living relatives of tetrapods. Humans, birds, reptiles and amphibians are tetrapods.
That relationship does not make lungfish our direct ancestors either. It means lungfish and tetrapods share a more recent common ancestor with one another than either does with coelacanths. All three lineages have continued evolving since their branches separated.
What makes coelacanths scientifically important?
- A rare window on deep vertebrate history: Living tissues and genomes can be compared with a long fossil record.
- Lobed fins: Their paired fins have internal bones and muscles that provide useful comparisons with the fin structures of other lobe-finned fishes.
- Genome-level evidence: The African coelacanth genome helps researchers test hypotheses about gene evolution and vertebrate relationships.
- A warning about visual similarity: A familiar outline can conceal extensive genetic and physiological change.
- A test case for evolutionary-rate questions: Coelacanths let scientists ask why some traits and gene categories change slowly while others do not.
The scientific value lies in comparison, not in treating the animal as an evolutionary time capsule. Researchers can compare a living genome, living anatomy and fossil structures, but no modern species is a frozen sample from the Devonian.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
How many coelacanths are there?
Do not treat historical specimen counts as current population estimates. The 2013 genome paper noted that 309 individuals had been recorded during the preceding 75 years, citing personal communication in that paper. That figure is an old, source-qualified count of recorded individuals, not a present global census.
Coelacanths are rarely encountered, live in deep habitats and are vulnerable to accidental capture and other pressures. The difficulty of surveying them means that abundance estimates carry substantial uncertainty. A low number of sightings can reflect biology and sampling conditions as well as population size.
What is their conservation status?
Conservation wording must be tied to a geography and legal system. NOAA Fisheries’ page, updated August 11, 2025, identifies the Tanzanian distinct population segment of the African coelacanth as threatened under the United States Endangered Species Act. The same page notes that African coelacanth is listed in CITES Appendix I.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThat statement does not establish one current category for every coelacanth population under every national law or international assessment. Regulatory classifications can change, and a legal designation for a Tanzanian distinct population segment should not be rewritten as a blanket claim about all coelacanths worldwide.
A precise answer to the title question
Coelacanths are called living fossils for historical and comparative reasons: fossils were known first, living representatives appeared unexpectedly in 1938, and the modern fish retains a broad form recognizable in fossils hundreds of millions of years old. The phrase becomes misleading only when it is taken literally.
Modern Latimeria species are not unchanged ancient organisms, evolution did not stop, and coelacanths are not our direct ancestors. Their slower evolution in some measured traits and gene categories is scientifically interesting precisely because it is partial and relative. The best use of “living fossil” is therefore as a memorable description of a rediscovered lineage—not as a claim that time stopped for the animals themselves.
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.
