A new species of Arrhopalites Börner (Collembola, Symphypleona, Arrhopalitidae) from China, with a key to the Asian species of the caecus group

Arrhopalites brevicornis sp. nov. head A left Ant IV (dorsal side) B left Ant III (ventral side) C left Ant I–II (dorsal side) D anterior head – left side shows the complete chaetotaxy, * marks unpaired chaetae, white arrow points to chaeta present or absent, large dashed circle on central clypeal region marks asymmetrical chaetae E ventral head chaetotaxy – right side shows the complete chaetotaxy, including labial basomedian and basolateral fields F left maxillary outer lobe and sublobal plate G prelabral chaetae and labrum.