Distinctive Collembola Communities in the Mesovoid Shallow Substratum: Entomobryomorpha of the Sierra de Guadarrama National Park (Central Spain) Author Baquero, Enrique University of Navarra, Faculty of Sciences, Department of Environmental Biology, University Campus, 31080, Pamplona (Spain) ebaquero@unav.es Author Jordana, Rafael University of Navarra, Faculty of Sciences, Department of Environmental Biology, University Campus, 31080, Pamplona (Spain) rjordana@unav.es Author Ortuño, Vicente M. Grupo de Investigación de Biología del Suelo y de los Ecosistemas Subterráneos, Departamento de Ciencias de la Vida, Facultad de Ciencias, Universidad de Alcalá, E- 28871, Alcalá de Henares, Madrid (Spain) vicente. ortuno @ uah. es vicente.ortuno@uah.es text Zoosystema 2021 2021-01-26 43 3 37 78 journal article 8557 10.5252/zoosystema2021v43a3 cd89b152-32bd-42cc-be33-a74a856fb5e4 1638-9387 4487162 urn:lsid:zoobank.org:pub:EA621D7C-F9AE-460B-8EBF-9E932862D4FE Isotomurus sp. MATERIAL EXAMINED. — Spain • 2 juveniles ; SSD-9 , slide 09; Ortuño et al. leg.; MZNA • 1 juvenile ; SSD-29 , slide 08 • 1 juvenile ; SSD-32 , slide 03; same data; MZNA . REMARKS By having only juvenile specimens, which appear to belong to the genus Isotomurus (fallen bothriotricha have been seen in two of the specimens), a reliable identification has not been possible.