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Publication - Dr Chenyang Cai

    Beetle Pollination of Cycads in the Mesozoic

    Citation

    Cai, C, Escalona, HE, Li, L, Yin, Z, Huang, D & Engel, MS, 2018, ‘Beetle Pollination of Cycads in the Mesozoic’. Current Biology, vol 28., pp. 2806-2812.e1

    Abstract

    Cycads, unlike modern wind-pollinated conifers and Ginkgo, are unusual in that they are an ancient group of gymnosperms pollinated by insects [1–3]. Although it is well documented that cycads were diverse and abundant during the mid-Mesozoic, little is known about their biogeography and pollination before the rise of angiosperms. Direct fossil evidence illuminating the evolutionary history of cycads is extremely rare [4, 5]. Here we report a specialized beetle-mediated pollination mode from the mid-Cretaceous of Myanmar, wherein a new boganiid beetle, Cretoparacucujus cycadophilus, with specialized pollen-feeding adaptations in its mouthparts and legs, was associated with many pollen grains of Cycadopites. Phylogenetic analyses indicate Cretoparacucujus as a sister group to the extant Australian Paracucujus, which pollinate the cycad Macrozamia riedlei. Our discovery, along with the current disjunct distribution of related beetle-herbivore (tribe Paracucujini) and cycad-host (tribe Encephalarteae) pairs in South Africa and Australia, indicate a probable ancient origin of beetle pollination of cycads at least in the Early Jurassic, long before angiosperm dominance and the radiation of flowering-plant pollinators later in the Cretaceous. Cai et al. report a new mid-Cretaceous boganiid beetle with specialized pollen-feeding adaptations. The phylogenetic analyses and associated pollen grains indicate that it was probably a pollinator of early cycads. This suggests an ancient origin of beetle pollination of cycads long before the rise of flowering plants.

    Full details in the University publications repository