Eleven species of oribatid mites are reported from Michoacán state, Mexico for the first time: Ceratozetidae: unidentified species of Adoribatella Woolley, 1967; Damaeidae: Belbodamaeus (Lanibelba) palaciosi (Iglesias & Guzmán, 2012);  Eremobelbidae: Eremobelba piffli Mahunka, 1985; Microzetidae: Acaroceras (Acaroceras) similis Balogh, 1962; Nothridae: Nothrus anauniensis Canestrini & Fanzago, 1877; Oppiidae: unidentified species of Cheloppia Hammer, 1971; Oppiella (Oppiella) nova (Oudemans, 1902); Pseudoamerioppia barrancensis (Hammer, 1961); Ramusella (Insculptoppia) merimna (Balogh & Mahunka, 1977); Wallworkoppia cervifer (Mahunka, 1983);  and Scheloribatidae: Scheloribates (Scheloribates) elegans Hammer, 1958. The genera Cheloppia and Adoribatella are reported for the first time from Mexico.

The present taxonomic study was carried out with material collected in the Michoacán state, Mexico, during one year of sampling. Ten new records of oribatid mites are reported for Mexico. Also, a new species, Gustavia mexicana sp. nov., is described, which differs from Gustavia fusifer (Koch, 1841), G. transylvanica Mahunka, 2006, G. latolamellata Hammer, 1977 and G. magnifica Golosova et Karppinen, 1984 by the absence of setal alveolus c, shape of sensillum, size and shape of rostrum, shape of lamella and presence of sejugal suture, respectively. A detailed description, schemes and photographs of the new species and an identification key for the species of the genus are provided.

The vertical distribution of oribatid mites was evaluated in a natural soil (pine-oak forest) in the municipality of San Juan Nuevo and an agricultural soil (avocado crop) in the municipality of Uruapan in Michoacán, Mexico.  Samples were taken in seven layers distributed in a 100 cm deep trench. A total of 466 oribatid mites/cm3, representing 37 species of 29 genera were identified. In both sites, the highest abundance and biodiversity were found in the top 5 cm layer. Nothrus anauniensis Canestrini & Fanzago, 1877 (Nothridae), Ramusella (Insculptoppia) merimna Balogh & Mahunka, 1977 (Oppiidae), Allogalumna (Acrogalumna) sp. 1 (Galumnidae) and Scheloribates sp. 2 (Scheloribatidae) were found at the greatest depths (10–25 cm in natural soil and 25–50 cm in agricultural soil).

Allogalumna (Acrogalumna) longipluma (Berlese, 1904) es una especie de amplia distribución, se reporta por primera vez en territorio mexicano. Los ejemplares fueron colectados en muestras de suelo de bosque de encino-pino y huerta sembrada con aguacate (Persea americana) en el municipio de Uruapan, Michoacán. El objetivo de este trabajo es proporcionar mayor información sobre la biología, comportamiento y morfología de todos los estadios de desarrollo en condiciones de laboratorio. El ciclo de vida desde la oviposición hasta la muerte del adulto fue de 217 ± 69.9 días, el estado de huevo tuvo la mayor duración 10.1 ± 1.8 días, seguido de la tritoninfa 9.4 ± 2.6; la vida adulta fue la de mayor variabilidad. Se describen e ilustran los cambios de tamaño, morfología, esclerotización, sistema octotáxico y quetotaxia del cuerpo de juveniles y adultos.

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