Miocene Ethiopian amber: a new source of fossil cryptogams - Archive ouverte HAL Access content directly
Journal Articles Journal of Systematics and Evolution Year : 2022

Miocene Ethiopian amber: a new source of fossil cryptogams

(1) , (2) , (2) , (3) , (4) , , (5) , (1) , (2)
1
2
3
4
5

Abstract

Amber is renowned for the exceptional preservation state of its inclusions, allowing detailed morphological analysis and providing relevant environmental, palaeoecological, geographical, and geological information. Amber deposits predominantly known from North America, Europe, and Asia, are considered to be rare on the continents that formed Gondwana. The recent discovery of fossiliferous amber deposits in Ethiopia therefore provides an inimitable opportunity to close gaps in the fossil record of African terrestrial biota, and to study organisms otherwise rare in the fossil record. Here we show that diverse cryptogams are preserved in highest fidelity in Miocene Ethiopian amber. We describe gametophyte fragments of four liverworts: Thysananthus aethiopicus sp. nov. (Porellales, Lejeuneaceae), Lejeunea abyssinicoides sp. nov. (Porellales, Lejeuneaceae), Frullania shewanensis sp. nov. (Porellales, Frullaniaceae), and Frullania palaeoafricana sp. nov. (Porellales, Frullaniaceae). Furthermore, we describe a pleurocarpous moss of the extant genus Isopterygium (Hypnales, Pylaisiadelphaceae) and a lichen representing the order Lecanorales. These new specimens represent the first amber fossils of liverworts, mosses, and lichens from the African continent and render Ethiopian amber one of the few worldwide amber deposits preserving bryophytes (mosses and liverworts) or lichens. Fossil species of Thysananthus were recorded in Eocene Baltic and Oligocene Bitterfeld as well as Miocene Dominican and probably also Miocene Mexican ambers. Fossils which can unequivocally be assigned to Lejeunea have only been found in Dominican amber, so far. Neotropical ambers contain only one taxon of Frullania to date, while the genus is most diverse in Baltic, Bitterfeld, and Rovno ambers, formed in temperate regions. The new fossils support a tropical to subtropical origin of Ethiopian amber. The new African liverwort fossils are included in an updated list of leafy liverworts described from worldwide Cenozoic ambers to date.
Fichier principal
Vignette du fichier
BOUJU-2021.pdf (2.47 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

insu-03231697 , version 1 (21-05-2021)

Identifiers

Cite

Valentine Bouju, Kathrin Feldberg, Ulla Kaasalainen, Alfons Schäfer‐verwimp, Lars Hedenäs, et al.. Miocene Ethiopian amber: a new source of fossil cryptogams. Journal of Systematics and Evolution, 2022, 60 (4), pp.932-954. ⟨10.1111/jse.12796⟩. ⟨insu-03231697⟩
105 View
55 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More