The family Onychiuridae (Collembola) from karst caves of the Basque biospeleologic district, with description of four new species Author Beruete, Enrique 0000-0002-3240-8946 University of Navarra, Faculty of Sciences, Department of Environmental Biology, University Campus, 31080 Pamplona, Spain. eberuete @ yahoo. es; https: // orcid. org / 0000 - 0002 - 3240 - 8946 eberuete@yahoo.es Author Arbea, Javier I. c / Ría de Solía 3, ch. 39. 39610 El Astillero (Cantabria). Author Baquero, Enrique 0000-0002-3240-8946 University of Navarra, Faculty of Sciences, Department of Environmental Biology, University Campus, 31080 Pamplona, Spain. eberuete @ yahoo. es; https: // orcid. org / 0000 - 0002 - 3240 - 8946 & University of Navarra, Institute of Biodiversity and Environment (BIOMA), University Campus, 31080, Pamplona, Spain * corresponding author: ebaquero @ unav. es; https: // orcid. org / 0000 - 0002 - 2145 - 8606 eberuete@yahoo.es Author Jordana, Rafael 0000-0002-3240-8946 University of Navarra, Faculty of Sciences, Department of Environmental Biology, University Campus, 31080 Pamplona, Spain. eberuete @ yahoo. es; https: // orcid. org / 0000 - 0002 - 3240 - 8946 eberuete@yahoo.es text Zootaxa 2021 2021-09-21 5040 2 151 194 journal article 10.11646/zootaxa.5040.2.1 1175-5326 5531192 CC1289B1-4FF9-4369-A596-9FF260C8F314 Micronychiurus aranzadii ( Beruete, Arbea & Jordana, 1994 ) Onychiurus aranzadii Beruete, Arbea & Jordana, 1994 . Publ. Biol. Univ. Navarra , Ser. Zool. , 24: 29 Micronychiurus aranzadii (Beruete, Arbea & Jordana) : Weiner, 1996 . Annls. Soc. ent. Fr. (N.S.) , 32: 186 Studied Material. Loc. 38. 4 ex. , 7.I.1966 ( holotype and paratypes ). Species known only from the type locality, Troskaeta cave in Gipuzkoa ( Beruete et al. 1994 , Jordana et al. 1997 , Beruete 2000a , Beruete et al. 2002 , Galán 2012 , Sendra et al. 2011 ) and has not appeared in other cavities of the Aralar massif.