Revision of some damsel-dragonflies (Odonata, Liassophlebiidae and Anglophlebiidae new family) from the Triassic/Jurassic of England and Antarctica

Abstract

Fossil insects from the Triassic-Jurassic boundary of England could provide an important resource for investigating the severity of extinction events in the terrestrial realm of the uppermost Triassic. However, the fossil record is poorly understood for this period even though there are abundant historical collections. Many of these collections are still in need of taxonomic revision before they can be used to reconstruct past entomofaunas and make inferences about diversity change through time. This paper is part of a larger project to revise the taxonomy of insects across the Triassic-Jurassic boundary of England to better understand changes in insect diversity through the Triassic-Jurassic boundary and associated extinction period. Herein, the damsel-dragonfly family Liassophlebiidae Tillyard, 1925 is revised and an additional specimen from the Early Jurassic of Antarctica is included.Rossiphlebianew genus is erected forLiassophlebia jacksoniZeuner, 1962;L. batheriTillyard, 1925 is considered nomen dubium and another specimen originally attributed toL. batheriis identified asL. withersiTillyard, 1925.Liassophlebia(?)clavigasterTillyard, 1925 andL.(?)hopei(Brodie, 1845) are considered incertae sedis at the generic level.Liassophlebia giganteaZeuner, 1962 is based on a fragmentary specimen but has several unique key characteristics. We redescribe it inAnglophlebianew genus and tentatively in Anglophlebiidae new family in Heterophlebioptera. Also discussed areL. magnificaTillyard, 1925,L. withersi, andL. pseudomagnificaWhalley, 1985, which are redescribed with updated figures.Caraphlebia antarcticaCarpenter, 1969 was originally described from the Early Jurassic of Antarctica as being closely related toLiassophlebia; it is herein confirmed in Selenothemistidae Handlirsch, 1939.UUID:http://zoobank.org/8fe9a39c-1c3b-4bda-92a6-92c1a0fc95b8

A new damsel-dragonfly of the small family Selenothemistidae from the Late Jurassic of China (Odonata, Isophlebioptera)

“…shares with the Selenothemistidae Handlirsch, 1939 the distal side (MAb) of the hindwing discoidal cell twice (or more) as long as basal side (= posterior part of arculus), but it differs from all the genera currently in this family in the shape of the hindwing subdiscoidal cell that has a long space between CuP and distal crossvein between AA and MP+CuA, plus a narrow anal area with only one cell below subdiscoidal cell (Hong, 1983;Nel et al, 1993;Kelly and Nel, 2018;Huang et al, 2018).…”