Karyotype description of Pomacea patula catemacensis (Caenogastropoda, Ampullariidae), with an assessment of the taxonomic status of Pomacea patula
Biocell
;
28(3): 279-285, dic. 2004. ilus, tab
Article
in English
| LILACS
| ID: lil-405200
RESUMO
Mitotic chromosomes of the freshwater snail Pomacea patula catemacensis (Baker 1922) were analyzed on gill tissue of specimens from the type locality (Lake Catemaco, Mexico). The diploid number of chromosomes is 2n = 26, including nine metacentric and four submetacentric pairs, therefore, the fundamental number is FN = 52. No sex chromosomes could be identified. The same chromosome number and morphology were already reported for P. flagellata, i.e., the other species of the genus living in Mexico. The basic haploid number for family Ampullariidae was reported to be n = 14 in the literaure; so, its reduction to n = 13 is probably an apomorphy of the Mexican Pomacea snails. Lanistes bolteni, from Egypt, also shows n = 13, but its karyotype is much more asymmetrical, and seems to have evolved independently from P. flagellata and P. patula catemacencis. The nominotypical subspecies, P. patula patula (Reeve 1856), is a poorly known taxon, whose original locality is unknown. A taxonomical account is presented here, and a Mexican origin postulated as the most parsimonious hypothesis.
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Index:
LILACS (Americas)
Main subject:
Snails
Limits:
Animals
Country/Region as subject:
Mexico
Language:
English
Journal:
Biocell
Journal subject:
Clulas
Year:
2004
Type:
Article
Affiliation country:
Argentina
/
Mexico
Institution/Affiliation country:
Universidad Autónoma Metropolitana Iztapalapa/MX
/
Universidad Nacional Autónoma de México/MX
/
Universidad Nacional del Sur/AR
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