Description of the immature stages of Kuwanina betula Wu & Liu, with a discussion of its placement in the Acanthococcidae family group (Hemiptera: Coccoidea) Author Wu, San-An Author Nan, Nan text Zootaxa 2015 3926 4 576 584 journal article 10.11646/zootaxa.3926.4.7 be148773-bc9e-4958-af37-4ab4e94a3de1 1175-5326 243974 1FAC6FC6-4336-4D89-B3FC-2F256009C7D7 Key to female instars of Pseudochermes betula . 1 Legs present; antennae with 6 segments................................................ first-instar nymph ( Fig. 1 ) - Fore and middle legs absent, hind legs replaced by pore plates; antennae with 3 segments............................ 2 2 Vulva present; body circular-oval; thoracic dorsum with tubular ducts on medial area; anal ring surrounded by a nearly circular sclerotized plate............................................................................. -adult female - Vulva absent; body oval; thoracic dorsum without tubular ducts on medial area; anal ring surrounded by an inverted U-shaped sclerotized plate................................................................. second-instar female ( Fig. 3 )