Troodontidae

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Six paravians (top to bottom): Confuciusornis, Dromaeosaurus, Microraptor, Anchiornis, a corvid, and the Prince Creek troodontid

Six paravians (top to bottom): Confuciusornis, Dromaeosaurus, Microraptor, Anchiornis, a corvid, and the Prince Creek troodontid

Six maniraptoran dinosaurs (top to bottom): the Zamyn Khondt oviraptorosaur, Sinornithosaurus, the Alaskan troodontid, Patagonykus, a short-tailed albatross, Nothronychus

The European troodontid Tamarro insperatus (MCD-7073) gen. et sp. nov. from the uppermost Maastrichtian of the Tremp Group, Tremp Basin, Southern Pyrenees. Photographic and interpretative ilustrations of the right second metatarsal in anterior (A-A’), lateral (B-B’), posterior (C–C’), medial (D-D’), and distal (F-F’) views. Scheme illustrating the gradual transition of the articular surface–grey arrow–for the accommodation of the metatarsal III (E). Detail of the distal end of the metatarsal II in anterior view showing the anterior contact surface of the metatarsal III (G). Detail of the articular surface of the metatarsal IV in the posterodistal part of the second metatarsal (H) ant anterior; f foramen; lat lateral; lc medial condyle; mc, lateral condyle; II–III contact between the second and third metatarsals; II–IV contact between the second and fourth metatarsals; plr plantar ridge; s sulcus.

Illustration of Sinusonasus (Dinosauria, Theropoda, Coelurosauria, Deinonychosauria, Troodontidae). This restoration is an edited and updated version of a drawing I originally uploaded on Wikimedia at December 11th 2009 (which i turn is based on a fossil seen at http://site.sinodino.com/Museum/images/Sinusonasus.JPG.).

Diagram featuring the holotype (BNMNH-PV030) skull of the troodontid Papiliovenator neimengguensis, from the Bayan Mandahu Formation. Abbreviations: a, angular; d, dentary; f, frontal; j, jugal; l, lacrimal; m, maxilla; n, nasal; p, parietal; q, quadrate; s, surangular; sp, splenial.[1] References ↑ (2022). "A new troodontid from the Upper Cretaceous Gobi Basin of inner Mongolia, China". Cretaceous Research 130: Article 105052. DOI:10.1016/j.cretres.2021.105052.

Skull of troodontid theropod Xixiasaurus henanensis gen. et sp. nov. (HGM 41HIII−0201; holotype), lower–middle Majiacun Formation (Upper Cretaceous: Coniacian–Campanian), Henan Province, China; in dorsal (A); lateral (B), and ventral (C) views. Note that this version of the image does not include the interpretative lines of the version in the paper.