Additional features of Aristolochioxylon prakashii Kulkarni &amp; Patil from Nawargaon Intertrappeans, Maharashtra

Datar, Kalpana; Patil, K.S.

doi:10.54991/jop.2006.93

Cited by 1 publication

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“…Wood of Aristolochioxylon prakashii A.R.Kulk. & K.S.Patil from the latest Cretaceous (late Maastrichtian) Deccan Intertrappean Beds, India, has been assigned to the Aristolochiaceae (Kulkari and Patil 1977;Datar and Patil 2006), but Hexagyne philippiana Coiffard, B.A.R.Mohr & Bernardes-de-Oliveira from the Early Cretaceous (Aptian) of Brazil (Coiffard et al 2014) is currently the oldest fossil possibly related to Aristolochiaceae. The species is based on two leafy shoots, one of which bears flowers that are described as hypogynous with a syncarpous, hexacarpellate gynoecium.…”

Section: The Fossil History Of Aristolochiaceae and Piperalesmentioning

confidence: 99%

Early and Mid-Cretaceous Aristolochiaceous Seeds from Portugal and Eastern North America

Friis

Crane

Pedersen

2022

International Journal of Plant Sciences

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Premise of research. The fossil record of Aristolochiaceae (Piperales, magnoliids) is sparse, particularly from Cretaceous strata. Fossil seeds from the Early and mid-Cretaceous of Portugal and North America provide the earliest unequivocal documentation of the group.Methodology. Detailed morphological and anatomical investigations of the fossil aristolochiaceous seeds were carried out using SEM and synchrotron radiation X-ray tomographic microscopy (SRXTM). Comparison with other seeds, extinct as well as extant, was based on published data and SRXTM analyses.Pivotal results. Two new genera and two new species, Aristospermum huberi and Siratospermum mauldinense, are described based on fossil seeds from the Early and mid-Cretaceous of Portugal and North America. The seeds are anatropous and bitegmic, with the micropyle formed by the inner integument. The testa consists of an exotesta of varied thickness and an endotesta of crystalliferous cells. The tegmen is three cell layers thick and consists of an outermost layer of longitudinally aligned fibers, a middle layer of transversely aligned fibers perpendicular to the longitudinal fibers, and an inner layer of thin-walled cuboidal cells. In most seeds the exotesta is abraded, exposing the crystalliferous cells of the endotesta. Among extant plants, a similar seed coat with a crystalliferous endotesta and crossing fibers in the tegmen is unique to Aristolochiaceae. Conclusion.The unique seed coat allows Aristospermum and Siratospermum to be assigned confidently to the lineage that today includes extant Aristolochiaceae. Aristospermum and Siratospermum provide the first unequivocal documentation of the Aristolochiaceae lineage of the Piperales during the Early Cretaceous diversification of angiosperms.

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Section: The Fossil History Of Aristolochiaceae and Piperalesmentioning

confidence: 99%