Late Campanian fossil of a legume fruit supports Mexico as a center of Fabaceae radiation

Centeno-González, Naylet K.; Martínez‐Cabrera, Hugo I.; Porras-Múzquiz, Héctor; Estrada‐Ruiz, Emilio

doi:10.1038/s42003-020-01533-9

Cited by 22 publications

(12 citation statements)

References 42 publications

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“…While the number of fossils collected influences these data, they nonetheless indicate floral turnover at the Pu2/Pu3 boundary. Importantly, we see the first appearace of the angiosperm family Leguminosae (= Fabaceae) outside of Central America (Centeno-Gonzalez et al 2021 ) anywhere in the world in the form of both fossil legume pods and leaflets at this stratigraphic level (Lyson et al 2019a ). Legumes would have represented a new, high-protein food source for herbivores such as T. taoensis on the early Paleocene landscape.…”

Section: Geological Setting Age Control and Paleobotanical Contextmentioning

confidence: 83%

New Skull Material of Taeniolabis taoensis (Multituberculata, Taeniolabididae) from the Early Paleocene (Danian) of the Denver Basin, Colorado

et al. 2021

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Taeniolabis taoensis is an iconic multituberculate mammal of early Paleocene (Puercan 3) age from the Western Interior of North America. Here we report the discovery of significant new skull material (one nearly complete cranium, two partial crania, one nearly complete dentary) of T. taoensis in phosphatic concretions from the Corral Bluffs study area, Denver Formation (Danian portion), Denver Basin, Colorado. The new skull material provides the first record of the species from the Denver Basin, where the lowest in situ specimen occurs in river channel deposits ~730,000 years after the Cretaceous-Paleogene boundary, roughly coincident with the first appearance of legumes in the basin. The new material, in combination with several previously described and undescribed specimens from the Nacimiento Formation of the San Juan Basin, New Mexico, is the subject of detailed anatomical study, aided by micro-computed tomography. Our analyses reveal many previously unknown aspects of skull anatomy. Several regions (e.g., anterior portions of premaxilla, orbit, cranial roof, occiput) preserved in the Corral Bluffs specimens allow considerable revision of previous reconstructions of the external cranial morphology of T. taoensis . Similarly, anatomical details of the ascending process of the dentary are altered in light of the new material. Although details of internal cranial anatomy (e.g., nasal and endocranial cavities) are difficult to discern in the available specimens, we provide, based on UCMP 98083 and DMNH.EPV 95284, the best evidence to date for inner ear structure in a taeniolabidoid multituberculate. The cochlear canal of T. taoensis is elongate and gently curved and the vestibule is enlarged, although to a lesser degree than in Lambdopsalis .

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Section: Geological Setting Age Control and Paleobotanical Contextmentioning

confidence: 83%

New Skull Material of Taeniolabis taoensis (Multituberculata, Taeniolabididae) from the Early Paleocene (Danian) of the Denver Basin, Colorado

et al. 2021

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“…60–58 Ma (Herrera et al, 2019 ; Carvalho et al, 2021 ). Centeno‐González et al ( 2021 ) reported a legume‐like fossil fruit from the Campanian (Late Cretaceous) Olmos Formation in northern Mexico. However, in our opinion, the resemblance of the single fossil fruit to the legume family is only superficial; structural details are not sufficient to be confident of the assignment to the Leguminosae.…”

Section: Discussionmentioning

confidence: 99%

Fossil papilionoids of the Bowdichia clade (Leguminosae) from the Paleogene of North America

Herendeen

Cardoso

Herrera

et al. 2022

American J of Botany

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Premise Understanding the evolutionary history of flowering plants has been enriched by the integration of molecular phylogenies and evidence from the fossil record. Fossil fruits and leaves from the late Paleocene and Eocene of Wyoming and Eocene of Kentucky and Tennessee are described as extinct genera in the tropical American Bowdichia clade of the legume subfamily Papilionoideae. Recent phylogenetic study and taxonomic revision of the Bowdichia clade have facilitated understanding of relationships of the fossil taxa and their evolutionary implications and paleoenvironmental significance. Methods The fossils were studied using standard methods of specimen preparation and light microscopy and compared to fruits and leaves from extant legume taxa using herbarium collections. Phylogenetic relationships of the fossil taxa were assessed using morphology and DNA sequence data. Results Two new fossil genera are described and their phylogenetic relationships are established. Paleobowdichia lamarensis is placed as sister to the extant genus Bowdichia and Tobya claibornensis is placed with the extant genera Guianodendron and Staminodianthus. Conclusions These fossils demonstrate that the tropical American Bowdichia clade was present in North America during a period when tropical or subtropical conditions prevailed in the northern Rocky Mountains during the late Paleocene and the Mississippi Embayment during the middle Eocene. These fossils also document that the Bowdichia clade had diversified by the late Paleocene when the fossil record of the family is relatively sparse. This result suggests that future work on early fossil legumes should focus on tropical and subtropical climatic zones, wherever they may occur latitudinally.

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“…Furthermore, physical dormancy or DT is explained through an LEA gene regulatory network, which is now known to have evolved through WGD (Verdier et al, 2013;Marques, 2018;Artur et al, 2019a). Although older, Fabaceae-like fruits are reported from the late Campanian in Mexico (Centeno-González et al, 2021), these fruits lack diagnostic characteristics associated with this family (Herendeen , 2022). The oldest confirmed Fabaceae fruits first appear in seasonal tropical forests in the Denver Basin, Colorado, slightly above the KPB (Lyson et al, 2019;Herendeen et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Did selection for seed traits across the Cretaceous/Paleogene boundary sort plants based on ploidy?

Berry¹,

Jaganathan²

2022

Acta Palaeobot.

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Paleobotanists debate whether the Cretaceous/Paleogene boundary (KPB) event was selective. As the hypothesis that the KPB event selected for plants with fast-return leaf economic traits (e.g. deciduousness) has lost empirical support in recent investigations, researchers have turned to alternative hypotheses to explain an abrupt decline in primary productivity across the KPB. Two contemporary hypotheses designed to explain selectivity among plants across the KPB are that (1) polyploids exhibited greater survivorship than their diploid progenitors or counterparts (i.e. the KPB-whole genome duplication or WGD hypothesis) and that (2) plants with desiccation-tolerant (DT), i.e. orthodox, seeds exhibited greater survivorship than plants with desiccationsensitive (DS), also known as recalcitrant, seeds. Late embryogenesis abundant (LEA) protein gene families are perceived to confer DT and seed longevity among vascular plants. Non-parametric Wilcoxon signed-rank test for matched pairs and a Mann-Whitney U test reveal that plant lineages perceived to have undergone WGD across the KPB exhibit significantly greater numbers of LEA genes than those that did not. On the basis of these data, this investigation elicits a merger between the KPB-WGD and KPB-seed traits concepts. However, emphasis is shifted from the concept of WGD as an immediate adaptation to climatic stress at the KPB (the KPB-WGD hypothesis) to the concept that WGD was an exaptation, which, by definition, fortuitously enhanced the survival of vascular plants across the KPB but that probably evolved initially in other climatic contexts.

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Late Campanian fossil of a legume fruit supports Mexico as a center of Fabaceae radiation

Cited by 22 publications

References 42 publications

New Skull Material of Taeniolabis taoensis (Multituberculata, Taeniolabididae) from the Early Paleocene (Danian) of the Denver Basin, Colorado

New Skull Material of Taeniolabis taoensis (Multituberculata, Taeniolabididae) from the Early Paleocene (Danian) of the Denver Basin, Colorado

Fossil papilionoids of the Bowdichia clade (Leguminosae) from the Paleogene of North America

Did selection for seed traits across the Cretaceous/Paleogene boundary sort plants based on ploidy?

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