Stenonychosaurus inequalis is closely related to Saurornithoides mongoliensis, a small theropod dinosaur from the Cretaceous Oldman Formation of Alberta.

A new specimen of Stenonychosaurus from the Oldman Formation (Cretaceous) of Alberta

This study reveals that 11 species of stegosaur are valid, with Tuojiangosaurus, Loricatosaurus, and Paranthodon as sister taxa to Stegosaurus, and Gigantspinosaurus as the most basal stegosaur.

Systematics and phylogeny of Stegosauria (Dinosauria: Ornithischia)

Hesperonychus elizabethae is the first microraptorine known from North America, suggesting a significant carnivore community in the Late Cretaceous Dinosaur Park Formation of Alberta, Canada.

A microraptorine (Dinosauria–Dromaeosauridae) from the Late Cretaceous of North America

Dinosaurs likely had similar chromosome patterns to birds, contributing to their diverse appearance and function, and their ability to survive multiple extinction events.

Dinosaurs: Comparative Cytogenomics of Their Reptile Cousins and Avian Descendants

The evidence for a common dinosaur-avian stem in the Permian period may be strengthened by recent discoveries of new avian resemblances among dinosaurs.

Reconsideration of the Evidence for a Common Dinosaur-Avian Stem in the Permian. Dinosaur Contributions, No. 4

The new sauropodomorph specimen from southern Brazil provides evidence for an early increase in body size in Sauropodomorpha, with a weight of 3.2 times heavier than Buriolestes schultzi, the earliest-branching sauropod.

A Sauropodomorph (Dinosauria, Saurischia) Specimen from the Upper Triassic of Southern Brazil and the Early Increase in Size in Sauropodomorpha

This study provides the first complete anatomy of Asilisaurus kongwe, a dinosauriform from the Middle Triassic Manda Beds of Tanzania, revealing its unique skull and plesiomorphic features, suggesting high homoplasy and parallel trends within Silesauridae and early dinosaur lineages

The Anatomy of Asilisaurus kongwe, a Dinosauriform from the Lifua Member of the Manda Beds (~Middle Triassic) of Africa

The early ornithodirans (Kongonaphon kely) from the Triassic of Madagascar show a miniaturization event near the common ancestor of dinosaurs and pterosaurs, potentially explaining the origins of flight in pterosaurs and fuzzy integu

A tiny ornithodiran archosaur from the Triassic of Madagascar and the role of miniaturization in dinosaur and pterosaur ancestry

Anzu wyliei is a new large-bodied oviraptorosaurian theropod dinosaur from the upper Cretaceous Hell Creek Formation of North and South Dakota, likely a generalist that fed on vegetation, small animals, and eggs.

A New Large-Bodied Oviraptorosaurian Theropod Dinosaur from the Latest Cretaceous of Western North America

Saurosuchus galilei, a Triassic apex predator, had a strong skull and exhibited some convergence with theropods, but had a weak bite and may have avoided tooth-bone interactions and consumed softer parts of carcasses.

Functional morphology of the Triassic apex predator Saurosuchus galilei (Pseudosuchia: Loricata) and convergence with a post‐Triassic theropod dinosaur

The Ornithoscelida hypothesis is not the final word on the dinosaur family tree, as there is still great uncertainty about its basic structure and origin.

Untangling the dinosaur family tree

Dinosaurs are a single monophyletic group with high aerobic exercise metabolism, justifying a new class, Dinosauria, alongside birds and cursorial mammals.

Dinosaur Monophyly and a New Class of Vertebrates

Sinornithosaurus millenii, a new dromaeosaurid dinosaur from the Yixian Formation of China, demonstrates a close relationship to birds and supports the idea that bird flight originated from the ground up.

A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China

Giganotosaums carolinii is a new, primitive giant carnivorous dinosaur from the Upper Cretaceous of Patagonia, representing a primitive evolutionary iteration of large theropods and potentially the world's largest predatory dinosaur.

A new giant carnivorous dinosaur from the Cretaceous of Patagonia

Thecospondylus Daviesi's cervical vertebra shows affinity with Ccelurus fragilis, but the author proposes combining Sauropoda and Theropoda into a single order, the Theropoda.

Classification of the Dinosauria

Dreadnoughtus schrani is the most complete titanosaur yet discovered, providing new insights into their anatomy and evolutionary history.

A Gigantic, Exceptionally Complete Titanosaurian Sauropod Dinosaur from Southern Patagonia, Argentina

Dinosaurs played a crucial role in shaping Jurassic-Cretaceous ecosystems and contributed to the evolution of the avian body plan, but much remains unknown due to incomplete fossil records.

Dinosaur Macroevolution and Macroecology

The Rhabdodontidae were small- to medium-sized herbivores with a stocky build and triangular skull, occupying different ecological niches than sympatric herbivorous dinosaur clades in the Late Cretaceous European Archipelago.

﻿The Rhabdodontidae (Dinosauria, Ornithischia), an enigmatic dinosaur group endemic to the Late Cretaceous European Archipelago

Dinosaurs have lived for 900-1200 genera, with the fossil record being 25% complete, and their diversity peaked in the Maastrichtian near the peak of their historic diversity.

Counting dinosaurs: how many kinds were there?

This study discovers a skeletally immature Unaysaurus tolentinoi specimen from the Caturrita Formation, expanding the record of this early sauropodomorph and representing an additional juvenile dinosaur from the Caturrita Formation.

On a skeletally immature individual of Unaysaurus tolentinoi (Dinosauria: Sauropodomorpha) from the upper Triassic of southern Brazil

what animal is most closely related to dinosaurs

These studies suggest that birds are the animals most closely related to dinosaurs.