Peer Review #2 of "A new juvenile Yamaceratops (Dinosauria, Ceratopsia) from the Javkhlant Formation (Upper Cretaceous) of Mongolia (v0.1)"

Published: April 5, 2022

Here we report a new articulated skeleton of Yamaceratops dorngobiensis (MPC-D 100/553) from the Khugenetjavkhlant locality at Shine Us Khudag (Javkhlant Formation, ?Santonian-Campanian) eastern Gobi Desert, Mongolia, which represents first substantially complete and juvenile individual this taxon.The specimen includes nearly cranium large portions vertebral column appendicular skeleton.Its skull is about 2/3 size holotype specimen, based on mandibular length.Its ontogenetic stage confirmed by multiple indicators skeletal morphological immaturity known in ceratopsians, such as long-grained surface texture long bones, smooth external postorbital, open neurocentral sutures all caudal vertebrae, orbit relative to postorbital jugal, low angle lacrimal ventral ramus maxillary teeth row, narrow frontal, straight edge dentary.Osteohistological analysis MPC-D 100/553 recovered three lines arrested growth, implying around years age when it died, verified specimen's immature stage.The adds autapomorphy Yamaceratops, anteroventral margin fungiform dorsal end being excluded antorbital fossa.Furthermore, shows unique combination diagnostic features some other basal neoceratopsians: ventrally hooked rostral bone Aquilops americanus very tall middle neural spines or more than four times high centrum Koreaceratops hwaseongensis, Montanoceratops cerorhynchus, Protoceratops andrewsi.The jugal with subtemporal

Language: Английский

Peer Review #1 of "A new juvenile Yamaceratops (Dinosauria, Ceratopsia) from the Javkhlant Formation (Upper Cretaceous) of Mongolia (v0.1)"

Published: April 5, 2022

Here we report a new articulated skeleton of Yamaceratops dorngobiensis (MPC-D 100/553) from the Khugenetjavkhlant locality at Shine Us Khudag (Javkhlant Formation, ?Santonian-Campanian) eastern Gobi Desert, Mongolia, which represents first substantially complete and juvenile individual this taxon.The specimen includes nearly cranium large portions vertebral column appendicular skeleton.Its skull is about 2/3 size holotype specimen, based on mandibular length.Its ontogenetic stage confirmed by multiple indicators skeletal morphological immaturity known in ceratopsians, such as long-grained surface texture long bones, smooth external postorbital, open neurocentral sutures all caudal vertebrae, orbit relative to postorbital jugal, low angle lacrimal ventral ramus maxillary teeth row, narrow frontal, straight edge dentary.Osteohistological analysis MPC-D 100/553 recovered three lines arrested growth, implying around years age when it died, verified specimen's immature stage.The adds autapomorphy Yamaceratops, anteroventral margin fungiform dorsal end being excluded antorbital fossa.Furthermore, shows unique combination diagnostic features some other basal neoceratopsians: ventrally hooked rostral bone Aquilops americanus very tall middle neural spines or more than four times high centrum Koreaceratops hwaseongensis, Montanoceratops cerorhynchus, Protoceratops andrewsi.The jugal with subtemporal

Language: Английский

SPASOS 1.1: a program for the inference of ancestral shape ontogenies

Cladistics, Journal Year: 2021, Volume and Issue: 37(5), P. 630 - 638

Published: May 28, 2021

Abstract We recently published a method to infer ancestral landmark‐based shape ontogenies that takes into account the possible existence of changes in developmental timing. Here we describe SPASOS, software perform analysis. SPASOS is an open‐source Windows program written C. Input data include landmark coordinates for each specimen –with corresponding information about timing– and phylogenetic tree showing relationships among species sampled. As output, produces image files easy visualization results useful post‐processing. The incorporates interpolating function, based on weighting moving averages, which allows analysis with scarce along ontogenetic trajectory. An empirical evaluation this function showed its suitability fill incomplete trajectories. Finally, present reanalysis dataset, where timing were originally inferred by considering PCA scores as variables. Both approaches retrieved same four largest timing, but differed shapes inferred.

Language: Английский