Morphology of juvenile instars of Ameronothridae (Acari: Oribatida) Author Ermilov, Sergey G. Phytosanitary Department, Nizhniy Novgorod Referral enter of the Federal service for Veterinary and Phytosanitary Inspection, Gagarin 97, 603107 Nizhniy Novgorod, Russia; E-mail: ErmilovAcari @ yandex. ru Author Stary, Josef Bology Centre, Academy of Sciences of the Czech Republic v. v. i., Institute of Soil Biology, Na Sádkách 7, CZ- 37005 eské Bud jovice, Czech Republic; Author Block, William British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB 3 0 ET, United Kingdom text Zootaxa 2012 2012-03-07 3224 1 1 40 https://biotaxa.org/Zootaxa/article/view/zootaxa.3224.1.1 journal article 10.11646/zootaxa.3224.1.1 1175-5326 5248802 Key to genera of known nymphal Ameronothridae 1. Gastronotic surface with sclerites and folds................................................................ 2 - Gastronotic surface only with folds...................................................................... 4 2. Eighteen or more gastronotic sclerites present; all gastronotic setae short or only setae h 1 – h 3 longer than others.......... 3 - Fewer than 16 gastronotic sclerites present; often gastronotic seta h 2 longer than h 1 and h 3 (exceptions: many gastronotic setae long or all setae short).............................................................. Halozetes -species group 1 ( H. capensis Coetzee & Marshall ; H. intermedius Wallwork ; H. littoralis Wallwork ; H. macquariensis (Dalenius) ; H. marinus marinus (Lohmann) ; H. marinus devilliersi Engelbrecht ; H. marinus minor Wallwork ; H. plumosus Wallwork ; H. necrophagus Wallwork ) 3. Interlamellar seta approximately three times longer than rostral seta; interlamellar seta clearly longer than their mutual distance.............................. Alaskozetes ( A. antarcticus antarcticus (Michael) , A. antarcticus intermedius Wallwork ) - Interlamellar seta approximately twice the length of rostral seta; interlamellar seta as long as their mutual distance or shorter.......................................... Podacarus ( P. auberi auberti Grandjean ; P. auberi occidentalis Wallwork )