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Gerardo Pérez-Ponce de León, Andrés Martínez-Aquino, Berenit Mendoza-Garfias
An integrative taxonomy approach is used to characterise the diversity of gorgoderid trematodes that parasitize freshwater fishes of the subfamily Goodeinae in central Mexico. Records of Phyllodistomum sp. and Dendrorchis sp. from the urinary bladder of goodeines have been previously published, although the identification at species level was not achieved. A few specimens were collected and fixed to conduct a scanning electron microscopy study, and to obtain sequences of a mitochondrial (COI) and nuclear (28S rRNA) gene, to be analysed in the context of the molecular phylogeny of gorgoderid trematodes...
2015: Zootaxa
Carlos Pedraza-Lara, Ignacio Doadrio
Dwarf crayfish are a subfamily of freshwater decapods distributed along the southeastern coast of United States and the Central Plateau of México. Recent phylogenetic studies have found that diversity of dwarf crayfish in México could be currently underestimated, and suggested the existence of possible new species for a number of clades for which taxonomic identity was uncertain, including one from Zacapu, a small lake in the Trans-Mexican Volcanic Belt. Here, a congruence criterion between morphological and molecular evidence is used to test if this previously detected clade should be considered as a new species...
2015: Zootaxa
Carmen Gabriela Estrada-Aguilar, Rooselvet Hernández-Carranza, Carlos Gómez-Alonso, María de Lourdes Negrete-Paz
BACKGROUND: the high incidence of cesarean section is a world health problem, and Mexico is not the exception. The purpose of the clinical practice guidelines is to establish accurate directions on delivery by cesarean section, diminishing its unjustified practice. The Regional General Hospital and Medical Family Unit 2 of the Instituto Mexicano del Seguro Social in Zacapu, Michoacán has 70 % of cesarean section rate, it is the double of the country average. The aim was to know causes of cesarean section...
September 2012: Revista Médica del Instituto Mexicano del Seguro Social
G Pérez-Ponce de León
Margotrema guillerminae n. sp. is described from the cyprinid Hybopsis calientis and the goodeid Alloophorus robustus from Lake Zacapu, Michoacán State, in the Mesa Central of Mexico. The new species is easily distinguished from the only other species of the genus, M. bravoae, by having short ceca, extending posteriad to reach the region of the anterior testis, vitelline follicles that are mainly lateral to the ceca but with some intercecal (particularly at the ovarian region), and a seminal receptacle that is located immediately posterior to the ovary...
October 2001: Journal of Parasitology
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