Waisum Ma

Waisum Ma

Doctor of Philosophy

About

13
Publications
6,078
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77
Citations
Citations since 2016
12 Research Items
77 Citations
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20162017201820192020202120220102030
Education
January 2019 - August 2022
University of Birmingham
Field of study
  • Earth Sciences (Palaeobiology)
September 2017 - August 2018
The University of Edinburgh
Field of study
  • Palaeontology and Geobiology
September 2013 - June 2017
The University of Hong Kong
Field of study
  • Geology & Ecology & Biodiversity

Publications

Publications (13)
Article
Oviraptorosauria is a clade of maniraptoran dinosaurs that lived in the Cretaceous, with primitive toothed forms known from the Early Cretaceous, while the toothless forms lived towards the end of Cretaceous. Yulong mini is the first oviraptorid hatchling collected from the Upper Cretaceous Qiupa Formation of Luachuan, central China. Here, we descr...
Article
Full-text available
Oviraptorosaurians are an unusual and probably herbivorous group of theropod dinosaurs that evolved pneumatised crania with robust, toothless jaws, apparently adapted for producing a strong bite. Using 3D retrodeformed skull models of oviraptorid oviraptorosaurians Citipati, Khaan, and Conchoraptor, along with the earliest diverging oviraptorosauri...
Article
Theropod dinosaurs underwent some of the most remarkable dietary changes in vertebrate evolutionary history, shifting from ancestral carnivory1, 2, 3 to hypercarnivory⁴,⁵ and omnivory/herbivory,6, 7, 8, 9 with some taxa eventually reverting to carnivory.10, 11, 12 The mandible is an important tool for food acquisition in vertebrates and reflects ad...
Article
Full-text available
Despite the discovery of many dinosaur eggs and nests over the past 100 years, articulated in-ovo embryos are remarkably rare. Here we report an exceptionally preserved, articulated oviraptorid embryo inside an elongatoolithid egg, from the Late Cretaceous Hekou Formation of southern China. The head lies ventral to the body, with the feet on either...
Article
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Tooth replacement rate is an important feature related to feeding mechanics and food choices for dinosaurs. However, only a few data points are available for sauropod dinosaurs, partially due to rarity of relevant fossil material. Four somphospondylan sauropod species have been recovered from the Lower Cretaceous Aptian–Albian Haoling Formation in...
Article
Pterosaurs, which lived during the Mesozoic, were the first known vertebrates to evolve powered flight.¹,² Arboreal locomotion has been proposed for some taxa,³,⁴ and even considered to have played a role in the origin of pterosaur flight.⁵,⁶ Even so, there is still need for comprehensive quantitative ecomorphological analyses.³,⁴ Furthermore, skel...
Article
Full-text available
Anurognathids are an elusive group of diminutive, potentially arboreal pterosaurs. Even though their monophyly has been well-supported, their intrarelationships have been obscure, and their phylogenetic placement even more. In the present work, we present a new genus and species from the Middle-Late Jurassic Tiaojishan Formation, the third nominal...
Chapter
Full-text available
Oviraptorosauria and Scansoriopterygidae are theropod clades that include members suggested to have partially or fully herbivorous diets. Obligate herbivory and carnivory are two ends of the spectrum of dietary habits along which it is unclear how diet within these two clades might have varied. Clarifying their diet is important as it helps underst...
Chapter
Full-text available
New and important pennaraptoran specimens continue to be discovered on a regular basis. Yet, with these discoveries the number of viable phylogenetic hypotheses has increased, including ones that challenge the traditional grouping of dromaeosaurids and troodontids within a monophyletic Deinonychosauria. This chapter will cover recent efforts to add...
Chapter
Full-text available
An unabated surge of new and important discoveries continues to transform knowledge of pen-naraptoran biology and evolution amassed over the last 150+ years. This chapter summarizes progress made thus far in sampling the pennaraptoran fossil record of the Mesozoic and Paleocene and proposes priority areas of attention moving forward. Oviraptorosaur...
Article
Full-text available
Oviraptorosaurs are bird‐like theropod dinosaurs that thrived in the final pre‐extinction ecosystems during the latest Cretaceous, and the beaked, toothless skulls of derived species are regarded as some of the most peculiar among dinosaurs. Their aberrant morphologies are hypothesized to have been caused by rapid evolution triggered by an ecologic...
Article
Full-text available
The Oviraptorosauria are a group of theropod dinosaurs that diverged from the typical carnivorous theropod diet. It includes two main lineages – Caenagnathidae and Oviraptoridae – that display a number of differences in mandibular morphology, but little is known about their functional consequences, hampering our understanding of oviraptorosaurian d...
Article
Full-text available
Basal hadrosauriform iguanodontian dinosaurs have been invaluable towards understanding the evolution of the complex and highly efficient advanced hadrosauriform tooth battery dental system. Here we report a new basal hadrosauriform maxilla specimen - IVPP V22529 - from the Dashuiguo Formation of Maortu, Nei Mongol, China that preserves a corrugate...

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