A phoresy of the pseudoscorpion Haplochelifer philipi (Chamberlin, 1923) in a phoretic association with Acrocinus longimanus was observed in Bocas del Toro Province, Panama. A phoretic female found under the elytra of the beetle. This is the first time that H. philipi has been reported in Panama.

The genus Epichernes Muchmore, 1982 has three Neotropical species with specific rodent hosts. Epichernes vickeryae sp. nov. is here described from Monteverde, Puntarenas, Costa Rica: the specimens were collected from a spiny pocket mouse Heteromys nubicolens. The new species, named E. vickeryae, is closer to E. navarroi by the position of trichobothria setae ist and isb, which are adjacent and the number of teeth on the movable finger, known from Mexico. The new species is characterized by trichobothrium ist adjacent to isb, femur L/B 1.71–1.85, it has 22–31 external accessory teeth, 58 teeth on fixed finger and 62 on movable finger. The carapace ranging from 1.12 mm to 1.33 mm in length, central tergites with 21–22 setae, chelicera with five setae on the hand, sb and b denticulate. The new species represents the second known species of Epichernes from Costa Rica.

The phoretic association between the pseudoscorpion species Lustrochernes minor and the fruit beetle Cotinis mutabilis is recorded for the first time, the small arachnids were found under the elytra of beetle. This phoretic association represents the first report for the family Scarabaeidae. Furthermore, this is the first documented occurrence of L. minor in the state of Oaxaca, Mexico.

El conocimiento de los milpiés y los ciempiés es escaso para México a pesar de su gran relevancia ecológica; en la Ciudad de México, se tiene registro de tan solo 14 especies de milpiés y 17 de ciempiés. En el presente trabajo se evaluó la diversidad para ambos grupos del Área Natural Protegida Bosque de Tlalpan que se ubica al sur de la Ciudad de México. Se efectuaron ocho visitas de febrero a septiembre de 2022 cubriendo las épocas de estiaje y de lluvias. Se implementaron los métodos de recolección directa y toma de muestras de suelo y hojarasca. La diversidad se determinó mediante el índice de diversidad de Shannon-Weiner y el índice de equidad de Pielou, además se analizó la eficiencia de muestreo mediante curvas de acumulación de especies utilizando los estimadores: ICE, Chao 2 y Jacknife 1. Se obtuvieron en total nueve especies de las cuales seis corresponden a la clase Diplopoda y tres a la clase Chilopoda. Se registran por primera vez tres especies y dos géneros de milpiés para la Ciudad de México. La diversidad dentro del área de estudio fue considerada como baja (H´= 1.55) con la dominancia de algunas especies (J´= 0.70). En todos los estimadores la eficiencia de muestreo sobrepaso el 91% indicando que la riqueza observada estuvo cerca de la esperada. Se incrementa el número de especies de milpiés de 14 a 19 para la Ciudad de México.

The phoretic interaction between Americhernes oblongus (Say) (Chernetidae) and Mallodon chevrolatti (Thomson) (Cerambycidae) is documented for the first time. Furthermore, with this record, the distribution of A. oblongus to western Panama is expanded. This study contributes to our knowledge of the pseudoscorpion fauna in the central part of America, particularly shedding light on phoretic interactions. Americhernes oblongus is now documented for the first time in West Panama, expanding the known distribution within the country. The discovery includes a female specimen found attached to a male Mallodon chevrolatii. This finding not only marks the initial occurrence of A. oblongus on the western side of the isthmus but also represents the first report of a phoretic interaction between these organisms. This study contributes to our knowledge of the pseudoscorpion fauna in the central part of America, particularly shedding light on phoretic interactions.