Our Brigs are really diffusa ????

Research related apple snail topics (like relations between species, article discussions, apple snail ecology, anatomy, genetic info etc.).
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Postby badflash on Sun Dec 02, 2007 5:34 pm

Ken, is your conclusion that aquarium snails are, in fact, P. Diffusa?
Never mind. I see in the paper it says:
Pomacea diffusa Blume, 1957
Pomacea diffusa is known as the spike-topped apple snail,
because of its relatively raised spire. It lacks a channeled
suture, and overlaps in size with the native P. paludosa
(Fig. 2a) [8]. The egg masses have an irregular honeycombed
appearance, like those of P. haustrum, but are
smaller and have a tan to salmon color (Fig. 3b), although
the egg masses are white when freshly laid. Pomacea diffusa
was originally described as a subspecies of Pomacea bridgesii.
Pain [19] argued that P. bridgesii bridgesii was a larger
form with a restricted range, with the smaller P. bridgesii
diffusa being the common form throughout the Amazon
Basin (Brazil, Peru, Bolivia). Cowie and Thiengo [12] suggested
that the latter might deserve full species status, and
the two taxa have been confirmed as distinct species by
genetic analyses [[27], K.A. Hayes, R.C. Joshi, S.C. Thiengo
and R.H. Cowie, in prep.].
The type locality of Pomacea diffusa is in the city of Santa
Cruz, Bolivia, although the species is widespread throughout
the Amazon Basin. Three samples from Belém, Brazil,
formed a well-supported clade with non-native populations
from Florida and Cuba (Fig. 5), exhibiting 0.4 to
1.8% sequence difference from the introduced populations.
Thompson [8] recorded this species (as P. bridgesii) in
Florida in Monroe, Miami-Dade, Broward, Palm Beach,
and Pinellas Counties. The FLMNH electronic database
also lists samples from Alachua County, but records cited
from the FLMNH database for Brevard County [e.g. [10]])
are in fact from Broward County. We have also collected
this species in Hillsborough and Collier Counties.
file 1. Note that a native range haplotype of P. insularum
from Argentina (ARG-078) is nested within introduced
North American haplotypes.
Last edited by badflash on Sun Dec 02, 2007 8:42 pm, edited 1 time in total.
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Postby Donya on Sun Dec 02, 2007 5:37 pm

effusa is actually considered a synonym of glauca

Looks like the species page here needs to be updated then - thanks. It's currently citing the captive population as effusa, which certainly isn't glauca. Aside from looking into the color traits for the species, it's not one I've looked into much in the past as far as the taxonomy.
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Re: ampullariid research

Postby Melody on Sat Mar 29, 2008 4:39 pm

khayes wrote: ... After comparison with 100’s of specimens from both introduced and native populations it is clear that there these taxa are two distinct species. Details of this work will be published over the next year or two, in the mean time there is another paper currently under review, and it covers the introduced species in SE Asia, including P. diffusa, P. scalaris, P. canaliculata and P. insularum. I hope it will be out in early 2008, and at that time I’ll be glad to provide a copy to anyone interested...

Its early 2008 :D . I would be extremely interested in obtaining any & all papers published and would be happy to purchase them if any/all will have a price tag.

Thanks very much for the post!
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Re: Our Brigs are really diffusa ????

Postby SGcvn69 on Mon Feb 02, 2009 3:39 pm

I think I am fully confused now :oops: Been out of the snail loop for too long! :)
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