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Table 4 Evolutional trends of key characters for Dermaptera

From: Transitional fossil earwigs - a missing link in Dermaptera evolution

Characters Archidermaptera (Protodiplatyidae &Dermapteridae) Eodermaptera (Bellodermatidae fam. nov.) Eodermaptera (Semenoviolidae & Turanodermatidae) Neodermaptera (Extant Earwigs)
No. of hind-leg tarsal segments 5 3 3 3
2nd tarsi Normal, not elongated heart-shaped Normal, not elongated Variable: normal but not elongated; or long and slender; or heart-shaped
8th and 9th abdominal tergites in females Distinct and separate from 10th tergite Narrowed, but separate from 10th tergite and not covered by 7th tergite Narrowed, but separate from 10th tergite and not covered by 7th tergite Fused to 10th tergite and covered by 7th
Adult cerci Segmented Segmented Un-segmented forceps. they are segmented in nymphs Un-segmented forceps. they are segmented in some nymphs
Adult cerci Symmetrical Asymmetrical Symmetrical Symmetrical
  1. No. = Number