In recent years, some authors have shown that some auroras can be observed at relatively low latitude when the geomagnetic activity is quiet or moderate. This very special type of aurora is called "sporadic aurora". We present and analyze in…

Twenty-four worms were collected from the bronchioles in both lungs of a male nine-banded armadillo Dasypus novemcinctus Linnaeus, 1758 captured in Teacalco, Morelos, Mexico. The worms, herein named Metathelazia mexicana n. sp., show a constriction in the esophagus at the…

Two species of holothuroids of the family Psolidae have been collected in the Gulf of California, Mexico. Psolus diomedeae Ludwig, 1894, a species previously known from the Pacific coast of Mexico and abundant in the Gulf of California was collected…

Seven new Mexican species of the gall associated doryctine genus Allorhogas are described, illustrated and molecularly characterized: A. amuzgo sp. nov., A. coccolobae sp. nov., A. crassifemur sp. nov., A. jaliscoensis sp. nov., A. marshi sp. nov., A. parvus sp.…

The "aje" (Llaveia axin axin) is a parasitic hemipteran of various tree species in tropical dry forests of Mexico and Guatemala. Females produce fatty extracts used since prehispanic times (i.e., traditional medicine and as raw material to produce handcrafts). However,…

The propagation of the Pacific-Cocos Segment of the East Pacific Rise (EPR-PCS) has significantly altered the plate configuration at the north end of the Middle America Trench. This ridge propagation, the collision of the EPR-PCS with the Middle America Trench,…

Deficient management of cinnabar mining left the San Joaquín region with high concentrations of mercury in its soils (2.4 - 4164 mg kg-1). Numerous cinnabar mines have contributed to the dispersion of mercury into agricultural (0.5 - 314 mg kg-1)…

During fieldwork in San Juan Teponaxtla, Oaxaca, 3 individuals of Aristolochia tricaudata Lemaire, a very rare species threatened with extinction, were observed with flowers and fruits. Although this species is present in many botanical gardens, fruits have never been observed.…

Significant changes in the isotopic composition of groundwater in the upper catchment of Rio Guanajuato, Mexico, were detected in two independent sets of samples for 3 % of the 1600 high-production wells in the area. Sampling was done in December…

On February 10th, 2010, the inhabitant population of some towns near the border between the States of Hidalgo and Puebla, Mexico, heard a strong blast overhead and felt seismic tremors and roof and windows vibration. At Tulancingo, Hidalgo, 25 km…