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I have gone over the revision, and you have answered the few minor comments well. Therefore, my decision is "Accept". At the same time, I have gone over your manuscript and found many small English corrections; please ensure these are done in the proof stage if not earlier. Please take a look at the attached pdf file and incorporate when you get your author proof.
Both reviewers had only very minor comments, primarily related to figures and tables, and I have no additional comments. Therefore, my decision is "minor revision".
The present manuscript brings us important information about some gastropods population, non only on its genetic variation, but also with some inferences about the migration of these species of snails through the Caribbean region.
The experimental design was carefully prepared and followed with a precious attention to all details, many important and crucial to the molecular biology studies.
The findings here presented are very important to show us the great diversity of snails species and the wide intra specific variation found in this group of animals. As well as, giving us some idea about the migration occurred turning these species an invading one in sonme countries. So, beyond this, the results may serve as a base to studies on host parasite relationships, once the snails from Bulimulus genus may be used as intermediate host for some larval helminths, allowing us understand the spreading of some diseases as that caused by Angiostrongylus cantonensis and other.
The manuscript is valuable and well conducted, The authors should correct the possition of legends and include scale bars to the sanils' figures and maps to improve the quality of the manuscript.
A useful contribution providing additional sequence data on a difficult group of molluscs. One very minor comment, the caption accompanying Table 2 should make clear reference to the where the information on the codes for each "Putative species" can be found (or better still, list out the binomials).
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