An updated checklist of Canadian and Alaskan Collembola Author Babenko, Anatoly Author Stebaeva, Sophya Author Turnbull, Matthew S. text Zootaxa 2019 2019-05-02 4592 1 1 125 journal article 26934 10.11646/zootaxa.4592.1.1 e5152ce0-a14b-4e7a-a676-26b4765bc49c 1175-5326 2656929 B6FF005C-D0AA-4532-8ACC-43D3DED984EF P. dentatus ( Folsom, 1902 ) – Aphorura dentata Folsom, 1902: 91 AK Folsom 1902 , 1917 ; McAtee 1923 ; Mills 1939 ; Hammer 1955 ; Christiansen & Bellinger 1980 , 1998 ; Skidmore 1995 ; Babenko & Fjellberg 2006 BC Christiansen & Bellinger 1980 , 1998 ; Battigelli & Marshall 1993 ; Rusek & Marshall 1995 ; Skidmore 1995 ; Addison et al. 2003; Cannings 2010 Remarks: The species is in the genus Paronychiurus on www. collembola .org, although its generic position remains uncertain. Originally, it was described by Folsom (1902) as having pseudocelli on all terga, including some on a hind margin of the head and subcoxae. Later Folsom (1917 , p. 648) corrected his description because “almost all the structures that I described as pseudocelli are in reality cuticular pits that form the sockets of exceptionally large setae”. As a result, his O. dentatus with 20/000/00022 pseudocelli was chosen by Bagnall (1948) as a type of his monotypic genus Pseudonychiurus (omitted on www. collembola .org). Christiansen & Bellinger (1980) studied Folsom’s types and gave quite different pseudocellar formulas, 23/0-122/3334-52 (dorsal) and 1/000/00-110-1 (ventral), which excludes this form not only from the genus Paronychiurus but also from the whole Hymenaphorurini tribe. General distribution: Nearctic, “appears to be a marine littoral form” ( Christiansen & Bellinger 1980 , p. 448).