Some Collembola from Ibiza with descriptions of three new species, and a note on Hypogastrura serrata (Ågren, 1904)

A first list of Collembola from Ibiza is presented, based on material extracted from two soil samples in midwinter. Out of the 13 species that are recorded three are new to science, viz.: Hypogastrura pityusica, Lathriopyga ibicensis and Neosminthurus natalicius. The latter species forms the first European record of the genus Neosminthurus Mills, 1934. Another interesting discovery was that of Folsomides marchicus (Frenzel, 1941); arguments are brought forward that this species is a senior synonym of Subisotoma petiti Delamare Deboutteville, 1948. The holotype of Hypogastrura serrata (Agren, 1904) has been studied and some additions to the original description are presented. It is found that the specimen was heavily infected by Sporozoa; it is suggested that some characters reported as differentiating this taxon, in particular the serrated setae, might be caused by ecomorphic processes triggered by this infection.