Arlea judithnajtae n. sp. (Collembola: Isotomidae), a temperate North American member of a Gondwanan genus Author Bernard, Ernest C. text Zoosystema 2017 2017-03-31 39 1 87 93 http://dx.doi.org/10.5252/z2017n1a10 journal article 10.5252/z2017n1a10 1638-9387 5130867 urn:lsid:zoobank.org:pub:CE0954A6-3989-43C9-827C-0924974AE540 KEY TO THE SPECIES OF ARLEA WOMERSLEY, 1939 1. Two pairs of ocelli present ........................................................................................................................... 2 — Ocelli absent ............................................................................................................................................... 3 2. Mucro falcate; all setae smooth .................................................................................. A. lucifuga ( Arlé, 1939 ) — Mucro falciform with additional small ventral tooth; macrosetae strongly barbed ........................................... .............................................................................................................. A. spinisetis Mendonça & Arlé, 1987 3. Anterior face of manubrium with 1 + 1 setae ................................................................................................ 4 — Anterior face of manubrium with 4 + 4 or 5 + 5 setae ................................................................................... 7 4. Dens with at least 20 posterior setae .............................................. A. arenicola Abrantes & Mendonça, 2005 — Dens with 17 or fewer posterior setae .......................................................................................................... 5 5. Dens with 10 posterior setae; all Abd. V sensilla conspicuous, plump ............................................................. ...................................................................................... A. adetolai Mendonça, Abrantes & Fernandes, 2006 — Dens with at least 15 posterior setae; Abd. V sensilla slender ....................................................................... 6 6. Dorsal sensilla of Abd. I-III in middle setal row; Ant. IV with seven prominent sensilla; posterior face of manubrium with 26 setae ....................................................................................................... A. judithnajtae n. sp. — Dorsal sensilla of Abd. I-III in posterior setal row; Ant. IV with 8-9 prominent sensilla; posterior face of manubrium with 18 setae ............................................... A. psammophila Mendonça, Abrantes & Fernandes, 2006 7. Anterior face of manubrium with 4 + 4 setae; Ant. IV with five prominent sensilla ....... A. tridens Barra, 1997 — Anterior face of manubrium with 5 + 5 setae; Ant. IV with seven prominent sensilla ...................................... .................................................................................................................. A. caeca Rapoport & Rubio, 1968