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Post by theropod on Sept 30, 2015 3:56:22 GMT 5
Usually a species or genus lasting a few million years is already considered impressive, but what’s the record? That being said, T. cancriformis exist since the Triassic/Permian. Do I win? ;-) Thinking about it, is that the oldest extant species in existence or can anyone think of an older one? |
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Derdadort
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Post by Derdadort on Sept 30, 2015 11:03:40 GMT 5
Mmh, do all organisms count? On genus level there are many long live forms, but on species level the 220 my of T. cancriformis are already an extreme.
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Cross
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Post by Cross on Sept 30, 2015 11:14:17 GMT 5
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Cross
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Post by Cross on Sept 30, 2015 11:16:58 GMT 5
The Lamniformes, Chelonians, and Actinistians are worthy candidates as well. We also may be overlooking several plant taxa since none of us here are paleobotanists.
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Derdadort
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Post by Derdadort on Sept 30, 2015 11:52:05 GMT 5
The recent xiphosurids are not the same as in the Paleozoic, it's undebatle that there are lots of old taxa in modern times, but this doesn't implicate there are species with a similar age as well.
I thought also about some microfossils, but most of them are also used for biostratigrahy, so...
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Post by theropod on Sept 30, 2015 15:57:12 GMT 5
I was mostly thinking of species and genera, not so much clades (which can of course last very long).
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Cross
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Post by Cross on Sept 30, 2015 17:12:03 GMT 5
I'm not an invertebrate expert, so can anyone pinpoint which xiphosurid genus has the oldest temporal range? I mean, one that's still alive.
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Post by theropod on Sept 30, 2015 17:46:04 GMT 5
Somehow the palaeobiology database doesn’t list any fossil occurrences for any of the four extant species of horseshoe crab.
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Derdadort
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Post by Derdadort on Sept 30, 2015 18:24:12 GMT 5
So the term "living fossil" indicates rather a less derived bauplan and not long-living species  Nevertheless Wikipedia says there is a Triassic species called Limulus priscus and it's valid (Dunlop et al. 2013) wsc.nmbe.ch/resources/fossils/Fossils15.5.pdf |
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Derdadort
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Post by Derdadort on Sept 30, 2015 18:41:57 GMT 5
If it's on genus level I guess some lophotrochozoans (bivalves, brachiopods...) could be good candidates or maybe sponges. I was also searching for prokaryots (Precambrian!), but nothing so far.
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Cross
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Post by Cross on Sept 30, 2015 18:47:47 GMT 5
So the term "living fossil" indicates rather a less derived bauplan and not long-living species Nevertheless Wikipedia says there is a Triassic species called Limulus priscus and it's valid (Dunlop et al. 2013) wsc.nmbe.ch/resources/fossils/Fossils15.5.pdfYeah! At least I got close when I said xiphosurids |
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Post by creature386 on Sept 30, 2015 19:15:21 GMT 5
Is this only about animals? Because you mentioned species/genera and these don't necessarily only refer to animals. The cyanobacteria genus is interesting, as it exists since 280 million years: en.wikipedia.org/wiki/GloeobacterP.S. I know that we are in a zoology forum, but the formulation of the OP seems to be very biologically general. |
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Cross
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Post by Cross on Sept 30, 2015 19:26:25 GMT 5
Is this only about animals? Because you mentioned species/genera and these don't necessarily only refer to animals. The cyanobacteria genus is interesting, as it exists since 280 million years: en.wikipedia.org/wiki/GloeobacterP.S. I know that we are in a zoology forum, but the formulation of the OP seems to be very biologically general. Pretty certain that I also brought up plants and other non-animal organisms during our last discussion (was it on the "living mosasaur" thread?). |
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Post by dinosauria101 on May 13, 2019 5:55:47 GMT 5
I think Crocodylus has been around for about 25 million years
And Mamenchisaurus existed about 15-20 million years IIRC
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