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Togepsyllinae   is a distinctive group within   Psylloidea  , with its systematic status treated variously by different authors. Of the only two known genera,    Togepsylla    is better known and distributed in temperate and tropical East Asia. In this study, the taxonomy and morphology of    Togepsylla    was studied in detail. Keys to adults and fifth instar immatures of the genus are provided.    Togepsylla   glutinosae    sp. n.  is described, and    T.   matsumurana   ,    T.   takahashii   , and    T.   tibetana    are redescribed.    Syncoptozus    is compared with    Togepsylla    for differences in morphology. Modern psyllids have evolved their jumping hind legs via the elongation of the dorsal edge of coxa, the broadening of coxal wall, the thickening of meron, the backward twisting of the plane of trochanter, femur, and tibia, and the enlargement of trochanteral tendon. However, in    Togepsylla   , this modification has progressed halfway. The metapleuron of    Togepsylla    is arranged in a different way than other psyllids. The pleural sulcus is short, and the metepisternum and trochantin are not divided. Wax-secreting fields on abdominal sternites, resembling those of whiteflies, are found on all    Togepsylla    species, and described for the first time. Other distinctive characters of the genus are also revealed, e.g. frons completely fused with gena, a pair of extra sclerites present behind the base of thoracic furca, one-segmented aedeagus, and absence of a flag lobe on valvula dorsalis of ovipositor. Based on various similarities in morphology,   Togepsyllinae   may have a close relationship with   Aphalaridae  -  Rhinocolinae   and is possibly related to   Homotomidae  ,   Liviidae  -  Liviinae   and    Atmetocranium    (  Calophyidae  ). All the distinctive characters of   Togepsyllinae   suggest that the current placement of the group is doubtful, and the phylogeny of   Aphalaridae   needs to be resolved.

zookeys

Half-jumping plant lice – a taxonomic revision of the distinctive psyllid genus    Togepsylla    Kuwayama with a reassessment of morphology (  Hemiptera  ,   Psylloidea  )