Talk:Shark

Something I noticed

In the fossil record section, it says that the Hybodonts first appeared around 320 million years ago (around the mid carboniferous), but in the actual article about them, it says that started appearing in the late devonian, which was millions of years before the carboniferous. So, which one is the correct one?Blue Jay (talk) 10:27, 21 February 2022 (UTC)

I know i'm very late, but the first hybodonts were Roongodus and Lissodus from the late devonian. Abdullah raji (talk) 04:14, 13 January 2024 (UTC)

Distribution

I would like to know the distribution of sharks around the world. There doesn't appear to be a map. I might of missed a comment in the text if it says "sharks are found everywhere". I think of them as warm water species, so I wonder if they are found in polar sees. If my belief is incorrect, I'd like a little more information. Additional to that, is the effect of climate change on the ranges of marine life. Humpster (talk) 20:11, 31 January 2024 (UTC)

Semi-protected edit request on 7 February 2024

sharks are blue 86.98.153.42 (talk) 08:33, 7 February 2024 (UTC)

 Not done: Please ...

1. ... ensure the information you wish to add is not generalizing to a point of inaccuracy.
2. ... provide reliable sources to support your claims.
3. ... be detailed and formatted, such as "change X to Y" or "add X after Y".
   — Urro^{[talk][edits]} 12:41, 7 February 2024 (UTC)

Semi-protected edit request on 9 July 2024

Under Physiology > Thermoregulation, change "... and the scalloped hammerhead close its mouth and gills when they dives to depths of around 800 metres, holding its breath till it reach warmer waters again" to "... and the scalloped hammerhead closes its mouth and gills when it dives to depths of around 800 metres, holding its breath until it reaches warmer waters again". Spelling/Grammar corrections. 98.109.56.136 (talk) 15:21, 9 July 2024 (UTC)

Clade position

Currently, the clade box notes sharks as being equated with selachimorpha. Browsing through the overall listings of shark-related articles, it would be better described as elasmobranchii, minus batoidea. The current clade description excludes about half of all known sharks. Rhialto (talk) 15:16, 26 October 2024 (UTC)

The two classifications in Elasmobranchii use Selachii instead of Selachimorpha, so I think Selachii should be used in the taxobox and the cladogram. But I don't follow your objection. Which sharks are excluded from Selachii/Selachimorpha? Or which articles are showing a different classification, with shark orders excluded from Selachii?  —  Jts1882 | talk  16:56, 26 October 2024 (UTC)

As currently structured, Elasmobranchii splits into Euselachii > Neoselachii > Batoidea and Selachimorpha on one side, and Selachii > Galeomorphii > Carcharhiniformes and Lamniformes on the other. Selachi and its child clades is therefore excluded from the current definition of shark (=Selachimorpha). The Selachi clade includes hammerhead sharks, basking sharks, great white sharks, mako sharks, megamouth sharks, and sand tiger sharks, among others. I suppose it is possible that the clade tree structure itself is faulty. If that is the case, that is a much more complex fix, and well beyond my expertise. Rhialto (talk) 17:59, 26 October 2024 (UTC)