Two New Species of Ripipterygidae (Orthoptera, Tridactyloidea) from Mid-Cretaceous of Myanmar with a Key to the Genera of Tridactyloidea in Amber †.

On the contrary, I M. robustus i and the two new species described here share with Ripipterygidae pro- and meso-tarsi with only two tarsomeres, metatarsi with only one tarsomere, unsegmented cerci and developed paraproctal lobes. Graph: Figure 4 Details of Magnidactylusgracilis sp. nov.: (A) photograph of left mesotibia, (B) line drawing of left mesotibia, (C) photograph of right metatarsus, (photograph obtained by holding specimen SICAU-A-085 upright with its side up), (D) line drawing of right metatarsus, (E) photograph of terminal abdominal and (F) line drawing of terminal abdominal. Ripipterygidae are characterized by unsegmented cerci (the cerci are two-segmented in Tridactylidae), uninflated mesotibiae (the mesotibiae are distinctly inflated in Tridactylidae) and modified paraproctal lobes (in Tridactylidae, the paraproctal lobes are unmodified and cylindrical in shape) [[2], [4], [6]]. Protibia slightly inflated distally with four or five dactyls; metatibia lacking swimming plates, metatarsus over twice as long as apical spurs, with a subapical denticular process; paraproctal lobe modified and two-segmented, clavate, longer than the cercus. [Extracted from the article]