A new genus and species of damselfy (Zygoptera, ‘Megapodagrionidae’ sensu lato ) from the Lower Eocene Green river Formation in USA - MNHN - Muséum national d'Histoire naturelle Access content directly
Journal Articles Historical Biology Year : 2022

A new genus and species of damselfy (Zygoptera, ‘Megapodagrionidae’ sensu lato ) from the Lower Eocene Green river Formation in USA

André Nel

Abstract

The past diversity of Isoptera is relatively poorly documented. Many early-diverging families are only represented today by relicts of their Mesozoic and Cenozoic richness. Therefore, the onset of their evolutionary history and the transitions between families, or even between subsocial and eusocial ways of life, remain difficult to decipher and require additional fossil occurrences. Here, we report the oldest worker/pseudergate trapped in amber and a new Mastotermitidae, both from Hkamti amber. We document a diverse assemblage of species representing early-diverging families from the ‘Mid’-Cretaceous of Myanmar, including two new genera and four new species in as many different genera: Anisotermes bourguignoni sp. nov., Longitermes pulcher gen. et sp. nov., Magnifitermes krishnai gen. et sp. nov. and Mastotermes myanmarensis sp. nov. These descriptions provide significant morphological evidence to discuss the placement of the genus Anisotermes, confidently place the new genera and confirm the monophyly of Mastotermitidae. The diversity of Cretaceous isopterans, in light of the biology of their extant representatives, is used to discuss palaeoecological implications and highlights the radiation of early diverged Isoptera in the complex Cretaceous ecosystem. The validity of the species Meiatermes cretacicus is discussed.The past diversity of Isoptera is relatively poorly documented. Many early-diverging families are only represented today by relicts of their Mesozoic and Cenozoic richness. Therefore, the onset of their evolutionary history and the transitions between families, or even between subsocial and eusocial ways of life, remain difficult to decipher and require additional fossil occurrences. Here, we report the oldest worker/pseudergate trapped in amber and a new Mastotermitidae, both from Hkamti amber. We document a diverse assemblage of species representing early-diverging families from the ‘Mid’-Cretaceous of Myanmar, including two new genera and four new species in as many different genera: Anisotermes bourguignoni sp. nov., Longitermes pulcher gen. et sp. nov., Magnifitermes krishnai gen. et sp. nov. and Mastotermes myanmarensis sp. nov. These descriptions provide significant morphological evidence to discuss the placement of the genus Anisotermes, confidently place the new genera and confirm the monophyly of Mastotermitidae. The diversity of Cretaceous isopterans, in light of the biology of their extant representatives, is used to discuss palaeoecological implications and highlights the radiation of early diverged Isoptera in the complex Cretaceous ecosystem. The validity of the species Meiatermes cretacicus is discussed.
No file

Dates and versions

mnhn-04038920 , version 1 (21-03-2023)

Identifiers

Cite

André Nel. A new genus and species of damselfy (Zygoptera, ‘Megapodagrionidae’ sensu lato ) from the Lower Eocene Green river Formation in USA. Historical Biology, 2022, 108 (4), ⟨10.1080/08912963.2022.2136033⟩. ⟨mnhn-04038920⟩
5 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More