Posted by:
paalexan
at Wed Aug 13 22:17:50 2003 [ Email Message ] [ Show All Posts by paalexan ]
` The correct one is Lopez and Maxson's 1995 study comparing mitochondrial DNA among ratsnakes and racers. They compared the mtDNA of N. American and Eurasian Elaphe with those of a large number of racers. All of the racer species are basal to Elaphe in their tree. Since racers are the sister taxa of the ratsnakes, this is a good test to see if different species of Elaphe are in fact only convergently similar. If Elaphe is polyphyletic, some species should be closer to some of the racers than they are to each other. This is clearly not the case. All species of Elaphe form a clade along with Cemophora, Lampropeltis and Pituophis.'
I would add that Rhinechis is in this clade. That said, only four species of Elaphe sensu lato were included, and these belong to only two of the seven lineages within Elaphe sensu lato recognized by Utiger et al. There aren't enough taxa to support any conclusions about the phylogenetic relationships within Elaphe sensu lato, but even so, though the monophyly of the ratsnakes relative to the racers (whose monophyly is not supported) is supported, Lopez and Maxson's data support Utiger et al.'s conclusions that the relationship between Pantherophis and Elaphe is distant, and that Pantherophis is a derived taxon within Lampropeltini.
I can also add:
Lenk, Joger, and Wink, `Phylogenetic relationships among European ratsnakes of the genus Elaphe Fitzinger based on mitochondrial DNA sequence comparisons.' Amphibia-Reptilia, 22:329-339.
to the list of papers concluding that Elaphe sensu lato is polyphyletic. It's also worth mentioning that both Lenk et al. and Utiger et al. argue for East-Asian origins for the ratsnakes. Given that the taxa found by Lopez and Maxson to group most closely with the ratsnakes are European or Mediterranean (Coluber viridis, Coluber hippocrepis, and Spalerosophis diadema), this suggests that the closest relatives of the ratsnakes may not have been included in Lopez and Maxson's study.
Patrick Alexander
[ Hide Replies ]
- Elaphe is not polyphyletic - RSNewton, Tue Aug 5 15:20:38 2003
- RE: Elaphe is not polyphyletic - paalexan, Fri Aug 8 19:48:08 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sat Aug 9 18:35:21 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Aug 10 12:09:44 2003

- RE: Elaphe is not polyphyletic - paalexan, Sun Aug 10 14:45:35 2003
- RE: Elaphe is not polyphyletic - paalexan, Mon Aug 11 06:46:54 2003
- RE: Elaphe is not polyphyletic - RSNewton, Mon Aug 11 13:03:04 2003

- RE: Elaphe is not polyphyletic - RSNewton, Mon Aug 11 18:39:41 2003
- RE: Elaphe is not polyphyletic - paalexan, Mon Aug 11 23:10:39 2003
- RE: Elaphe is not polyphyletic - paalexan, Mon Aug 11 23:12:29 2003
- Sorry about the double post. No changes in content between them. ~NP~ - paalexan, Mon Aug 11 23:13:57 2003
- RE: Elaphe is not polyphyletic - paalexan, Tue Aug 12 00:36:58 2003

- RE: Elaphe is not polyphyletic - RSNewton, Tue Aug 12 05:19:31 2003
- RE: Elaphe is not polyphyletic - RSNewton, Tue Aug 12 05:32:50 2003
- RE: Elaphe is not polyphyletic - RSNewton, Tue Aug 12 11:48:08 2003
- RE: Elaphe is not polyphyletic - paalexan, Tue Aug 12 18:10:16 2003
- RE: Elaphe is not polyphyletic - paalexan, Tue Aug 12 18:25:24 2003
- RE: Elaphe is not polyphyletic - RSNewton, Wed Aug 13 01:12:02 2003
- RE: Elaphe is not polyphyletic - RSNewton, Wed Aug 13 01:54:51 2003
- RE: Elaphe is not polyphyletic - RSNewton, Wed Aug 13 02:09:40 2003
- RE: Elaphe is not polyphyletic - paalexan, Wed Aug 13 08:59:13 2003
- RE: Elaphe is not polyphyletic - paalexan, Wed Aug 13 09:14:49 2003
- RE: Elaphe is not polyphyletic - RSNewton, Wed Aug 13 21:35:06 2003
- RE: Elaphe is not polyphyletic - RSNewton, Wed Aug 13 22:00:23 2003
RE: Elaphe is not polyphyletic - paalexan, Wed Aug 13 22:17:50 2003
- RE: Elaphe is not polyphyletic - RSNewton, Wed Aug 13 22:21:06 2003
- RE: Elaphe is not polyphyletic - paalexan, Wed Aug 13 22:40:01 2003
- RE: Elaphe is not polyphyletic - paalexan, Wed Aug 13 22:53:13 2003
- RE: Elaphe is not polyphyletic - paalexan, Wed Aug 13 23:36:35 2003
- RE: Elaphe is not polyphyletic - RSNewton, Thu Aug 14 13:48:59 2003
- RE: Elaphe is not polyphyletic - RSNewton, Thu Aug 14 14:14:15 2003
- RE: Elaphe is not polyphyletic - paalexan, Thu Aug 14 14:37:05 2003
- RE: Elaphe is not polyphyletic - paalexan, Thu Aug 14 14:52:04 2003
- RE: Elaphe is not polyphyletic - paalexan, Thu Aug 14 14:53:36 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Aug 17 02:43:22 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Aug 17 05:22:14 2003

- RE: Elaphe is not polyphyletic - paalexan, Sun Aug 17 22:56:37 2003
- RE: Elaphe is not polyphyletic - paalexan, Sun Aug 17 23:24:09 2003
- BTW... - paalexan, Mon Aug 18 11:14:35 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Sep 21 09:48:50 2003

- RE: Elaphe is not polyphyletic - RSNewton, Sun Sep 21 11:34:01 2003

- RE: Elaphe is not polyphyletic - RSNewton, Sun Sep 21 12:14:10 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Sep 21 13:41:40 2003
- RE: Elaphe is not polyphyletic - RSNewton, Mon Sep 22 19:46:48 2003
- RE: Elaphe is not polyphyletic - RSNewton, Thu Sep 25 19:33:57 2003
- RE: Elaphe is not polyphyletic - paalexan, Sat Sep 27 16:08:57 2003
- RE: Elaphe is not polyphyletic - paalexan, Sun Sep 28 03:19:10 2003
- RE: Elaphe is not polyphyletic - paalexan, Sun Sep 28 03:22:40 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Sep 28 18:29:39 2003
- RE: Elaphe is not polyphyletic - paalexan, Sun Sep 28 22:02:37 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Oct 5 02:11:40 2003
- RE: Elaphe is not polyphyletic - paalexan, Sun Oct 5 03:54:01 2003
- RE: Elaphe is not polyphyletic - RSNewton, Sun Oct 5 09:50:27 2003
- RE: Elaphe is not polyphyletic - RSNewton, Mon Dec 22 10:07:23 2003
- RE: Elaphe is not polyphyletic - RSNewton, Mon Dec 22 10:25:05 2003
- RE: Elaphe is not polyphyletic - RSNewton, Mon Dec 22 10:42:55 2003
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