Talk:Cephalaspis

message: What source says that Cephalaspis, a freshwater osteostracan of the Devonian, was preyed upon by Megalograptus, a marine Ordovician eurypterid, and Brontoscorpio, a marine Carboniferous scorpion?
Isn't that analogous to saying that grizzly bears hunt Xiphactinus and arrowana?
Also, what source suggested that Cephalaspis was capable of generating electrical fields?--Mr Fink 03:15, 18 May 2006 (UTC)
replies: text: *sigh*  At least they didn't have Starr fighting the T.rex in it.--Mr Fink 23:35, 3 June 2006 (UTC)

text: Right, but that's not a really big inaccuracy, but saying Cephalaspis is the ancestor to gnathostomes is. What other source suggests this? Giant Blue Anteater 21:57, 21 September 2006 (UTC)
replies: text: I know of no other sources that also suggest that Cephalaspis was the ancestor to the gnathostomes.  Most experts lean toward the Thelodonts as the most likely gnathostome sister group.--Mr Fink 03:26, 22 September 2006 (UTC)
replies: text: I googled "Thelodonts ancestor to gnathostomes" but there's nothing relevant to the search. Which source suggests thelodonts are the ancestor of gnathostomes? The first gnathostomes appeared in the latest Ordovician. Most thelodonts I know are from the Silurian to the Devonian (the period when the Canadian fork-tailed one appeared). Giant Blue Anteater 20:32, 25 September 2006 (UTC)
replies: text: Did you try reading copies of the books "Rise of Fishes", "Fossil Fishes" or "Early Vertebrates"? The source that you found that said the very first gnathostomes being in the Late Ordovician is wrong: the first verifiable gnathostomes are the acanthodians, which first appeared during the Mid Silurian.--Mr Fink 06:38, 26 September 2006 (UTC)
replies: text: I'll get those books. The Wikipedia article says that the first ever gnathostomes appeared in the late Ordovivian. Giant Blue Anteater 22:06, 26 September 2006 (UTC)
replies: text: A brief discussion by Philippe Janvier is available at the Three of Life website: http://www.tolweb.org/Vertebrata/14829 Osteostracans are, according to their tree, closely related but not ancestral to the gnathostomes. Orcoteuthis (talk) 12:27, 25 February 2008 (UTC)
thread_title:  Disputed Data 

message: "Although it was heavily armored, this fish was an osteostracan cephalaspidomorph fish, and should not be confused with its jawed contemporaries, the placoderms." This is an odd thing to say - it makes it sound as if armour was anomalous for osteostracans, when in fact it's the norm. Armour was very common among Palaeozoic fishes of various groups, both gnathostomes and agnaths, and by no means restricted to placoderms. I'll take the liberty of changing it to something less misleading. Orcoteuthis (talk) 12:37, 25 February 2008 (UTC)
thread_title: Intro

message: What are the descendants of Cephalaspis? Phthinosuchusisanancestor (talk) 10:43, 1 January 2009 (UTC)
thread_title: Descendants

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thread_title:  External links modified 

message: Trout vary quite a bit in size, so this isn't very helpful. Please include an actual size range.--98.208.3.193 (talk) 00:30, 19 January 2022 (UTC)
thread_title:  "Trout sized"