Talk:Metacarcinus gracilis

Metacarcinus or Cancer?
Doesn't it seem premature to accept this generic designation? In particular, this designation by Ng et al. is not supported by the molecular study of Harrison. So, I suggest reversion back to Cancer gracilis. Sushilover2000 (talk) 19:18, 6 February 2010 (UTC)


 * Well, the Harrison & Crespi study is more than 10 years old, used only some of the 23 species in Cancer (sensu lato) and examined a single gene. By current standards, it's fairly weak. Different methods of phylogenetic inference produced different topologies, and the support values were fairly low. In contrast, most recent papers (including, significantly, Ng et al.) include the genus Metacarcinus. We have to follow the prevailing usage, so even if it isn't monophyletic, we have to carry on using it. Non-monophyly doesn't make the genus invalid, by the way, it may just mean that the boundaries of the various genera may need to be redrawn. In particular, if the Dungeness crab is in any new genus that doesn't contain Cancer pagurus (or the type species of another older genus), that new genus must be called Metacarcinus under the ICZN. --Stemonitis (talk) 06:04, 16 June 2010 (UTC)

The Problem is that Ng et al., don't even cite the Harrison and Crespi study, and there are no other molecular studies available. So Harrison and Crespi may be weak, but it is the only one and it is many times better than Ng et al. Going back to the old and not widely accepted genus of Metacarcinus seems very premature. I have no idea of why Ng et al. did that, but it certainly is not supported by the molecular data. I guess in a few years when somebody does a decent molecular study, we will know. Blindly following the obviously flawed Ng et al. now will just confuse people.--Sushilover2000 (talk) 21:09, 19 July 2010 (UTC)


 * Interestingly, a recent review of Cancer magister also rejects the genus Metacarcinus. Rasmuson, L. 2013. The Biology, Ecology and Fishery of the Dungeness crab, Cancer magister. Advances in Marine Biology. 65:95-148. 168.96.62.173 (talk) 20:06, 12 February 2016 (UTC)

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