Table 2 in New archidermapteran earwigs (Dermaptera) from the Middle Jurassic of Inner Mongolia, China

Table 2. Summary and comparisons of key characters for several described genera of Protodiplatyidae. Interrogative marks (?) indicate data unavailable.
GenusHeadNumber of antennomeresPronotumTegminaPygidiumCerci (ratio lengths cercus/body, cercomeres)AbrdermaBroader than pronotum17-19Elliptical, anterior and posterior margins subequal in widthWith venation, reaching second abdominal segmentSmall0.2,?ArchidermapteronNarrower than pronotum17-19Reniform, broad notch anteriorlyWith venation, reaching fourth abdominal segmentTransverse, trapeziform1.0, at least 40AsiodiplatysNarrower than pronotum22With shallow, broad notch anteriorlyWithout venation, not reaching second abdominal segment?0.5, 40Barbderma?19Oblong or trapezoidal, anterior and posterior margins subequal in widthWith venation, reaching first abdominal segmentSmall0.42,?LongicerciataBroader than pronotum26Transverse, anterior margin wider than posterior marginWithout venation, reaching fourth abdominal segment?1.0, at least 36MicrodiplatysBroader than pronotum19TransverseWith venation, reaching fourth abdominal segmentNot protruding1.0, at least 36PerissodermaNarrower than pronotum17Elliptical, anterior margin wider than posterior marginWith venation, reaching third abdominal segmentSmall0.5,?ProtodiplatysNarrower than pronotum17-18Transverse, notch in front, broadly rounded posteriorlyWith venation, reaching fourth abdominal segmentTransverse, trapeziform0.5, no more than 40SinoprotodiplatysNarrower than pronotum18Anterior and posterior margins subequal in widthWithout venation, reaching fourth abdominal segment?0.8, 20Aneuroderma gen. nov.As wide as pronotum20Oval, anterior and posterior margins subequal in widthWithout venation, reaching second abdominal segmentSmall0.5, 30