doi: 10.1016/j.pld.2024.03.002. eCollection 2024 Sep.
A new gnetalean macrofossil from the Lower Cretaceous of the Laiyang Basin, eastern China
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- PMID:39290879
- PMCID: PMC11403114
- DOI: 10.1016/j.pld.2024.03.002
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A new gnetalean macrofossil from the Lower Cretaceous of the Laiyang Basin, eastern China
Peihong Jin et al. Plant Divers..
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Abstract
•A new speciesLaiyangia compacta gen. et sp. nov. with unusual female spikes was described from the Laiyang Formation.•This species shows transitional morphology between early ephedroid and modern gnetoid.•The epidermal microstructural character of this species provides a driver paleoclimate of Laiyang area in Early Cretaceous.
© 2024 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
Conflict of interest statement
There is no conflict of interest.
Figures
A,Laiyangia compacta gen. et sp. nov. a–c, Part and counterpart displaying the general morphology of the species; scale bars = 2 cm; a, b, Specimen no. SDLY–2020–41A, B; c, Specimen no. SDLY–2021–47A; d-h, Female spikes under stereo microscopy, Specimen no. SDLY–2020–41A, B.; d, Female spikes showing their position and decussately opposite fertile bracts, scale bars = 2 mm; e, the uppermost bract of the female spike displaying 4 seeds in the adaxial part and the hollow and straight micropylar tubes, scale bars = 1 mm; f, g, individual fertile bract displaying one seed in the adaxial part and the hollow and straight micropylar tube, scale bars = 1 mm; h, Straight internode of reproductive shoot displaying longitudinal striations, scale bars = 1 mm; i, Details of epidermal features in the outer epidermis of the seed envelope under fluorescence microscopy, showing epidermal cells and stomatal complexes (white arrow), Specimen no. SDLY–2020–41A; b = bract; s = seed; mt = micropylar tube. B, Reconstruction ofLaiyangia compacta gen. et sp. nov., abbreviations: in = internode; n = node; l = leaf; b = bract; s = seed; mt = micropylar tube. C, Phylogenetic relationships ofLaiyangia compacta gen. et sp. nov. (bold type) with illustrations based on constrained Parsimony analysis of morphological characters for extinct species plus living species (∗) conducted under TNT v.1.5 software, showing the most parsimonious position ofL. compacta are within the family Ephedraceae. a,Siphonospermum; b,Prognetella; c, The compact female spikes type ofChengia–Liaoningia–Liaoxia group andLaiyangia compacta gen. et sp. nov.; d,Jianchangia; e, Female cone types of fossil and modernGurvanella–Beipiaoa–Ephedra group.
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