– Willemia intermedia Mills, 1934: 17
– ? Willemia biseta Christiansen & Bellinger, 1980: 237
BC Battigelli & Marshall 1993; Rusek & Marshall 1995; Skidmore 1995 all as intermedia and biseta; Addison et al. 2003, 2003a; Cannings 2010 as intermedia and biseta
QC Christiansen & Bellinger 1980, 1998; Skidmore 1995; Therrien et al. 1999, 1999a
NF Arulnayagam 1995; Puvanendran et al. 1997
Remarks: A synonymization of W. biseta with W. intermedia on www. collembola.org is probably based on Christiansen & Bellinger’s remark (1980, p. 237) that “this species [biseta] is similar to intermedia in many respects”, although they add “it is also similar to anophthalma ”. In any case, this species is not sufficiently described to make a sound conclusion (D’Haese 2000).
General distribution: Holarctic, with some doubtful southern records.