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Anatomy ofMahakala omnogovae(Theropoda: Dromaeosauridae), Tögrögiin Shiree, Mongolia

تشريح Mahakalaomnogovae (Theropoda: Dromaeosauridae)، Tögrögiin Shiree، منغوليا
Authors: Alan H. Turner; Diego Pol; Mark A. Norell;

Anatomy ofMahakala omnogovae(Theropoda: Dromaeosauridae), Tögrögiin Shiree, Mongolia

Abstract

Le dromaeosauridé Mahakala omnogovae est connu à partir d'un spécimen unique provenant des dépôts du Crétacé supérieur de la Formation de Djadokhta à Tögrögiin Shiree, Ömnögov Aimag, Mongolie. Le spécimen holotype est composé d'un crâne bien préservé mais partiel et d'un squelette post-crânien presque complet. Mahakala omnogovae est inclus dans une analyse phylogénétique complète de Coelurosauria à l'aide d'un ensemble de données, qui reflète un jeu de caractères et un régime d'échantillonnage des taxons très étendus. Plusieurs caractéristiques intéressantes de Mahakala omnogovae ont des implications pour l'évolution des caractères deinonychosauriens et avialiens et pour la compréhension des modèles de variation de taille et de changement de taille chez les théropodes paraviens. Ces morphologies comprennent la forme de la lame iliaque, le processus d'obturation triangulaire de l'ischion et l'évolution de la condition sous-arctométatarsienne. Nous présentons un diagnostic élargi de Mahakala omnogovae, qui comprenait la combinaison unique suivante de caractères (autapomorphies notées par *) : une dépression de type ledgelike à la confluence de la jambe métotique et de l'évidement tympanique postérieur sur la face antérieure du processus paroccipital *, une omoplate se rétrécissant postérieurement ; un membre antérieur raccourci (humérus de 50 % de la longueur du fémur) ; un ulna fortement comprimé et antéro-postérieur large se rétrécissant postérieurement à un bord étroit * ; une crête latérale allongée sur le fémur postérodistal * ; des vertèbres caudales antérieures avec prézygapophyses dirigées latéralement et subhorizontales * ; un processus supratrochantérique proéminent ; et l'absence d'une fosse cupupédique.

El dromeosáurido Mahakala omnogovae se conoce a partir de un espécimen único de los depósitos del Cretácico Superior de la Formación Djadokhta en Tögrögiin Shiree, Ömnögov Aimag, Mongolia. El espécimen holotipo está compuesto por un cráneo bien conservado pero parcial y un esqueleto postcraneal casi completo. Mahakala omnogovae se incluye en un análisis filogenético exhaustivo de Coelurosauria utilizando un conjunto de datos, que refleja un conjunto de caracteres y un régimen de muestreo de taxones muy ampliados. Varias características interesantes de Mahakala omnogovae tienen implicaciones para la evolución del carácter deinonychosaurian y avialan y para comprender los patrones de variación de tamaño y cambio de tamaño dentro de los terópodos paravianos. Estas morfologías incluyen la forma de la hoja ilíaca, el proceso obturador triangular del isquion y la evolución de la condición subarctometatarsaliana. Presentamos un diagnóstico ampliado de Mahakala omnogovae, que incluyó la siguiente combinación única de caracteres (autapomorfias observadas por *): una depresión en forma de ledgel en la confluencia del puntal metotico y el receso timpánico posterior en la cara anterior del proceso paroccipital *, una escápula que se estrecha posteriormente; una extremidad anterior acortada (longitud del fémur del 50% del húmero); un cúbito fuertemente comprimido y anteroposteriormente ancho que se estrecha posteriormente hasta un borde estrecho *; cresta lateral alargada en el fémur posterodistal *; vértebras caudales anteriores con prezigapófisis subhortal dirigida lateralmente *; un proceso supratrocánterico prominente; y la ausencia de una fosa cuppédica.

The dromaeosaurid Mahakala omnogovae is known from a unique specimen from the Late Cretaceous deposits of the Djadokhta Formation at Tögrögiin Shiree, Ömnögov Aimag, Mongolia. The holotype specimen is comprised of a well-preserved but partial skull and a nearly complete postcranial skeleton. Mahakala omnogovae is included in a comprehensive phylogenetic analysis of Coelurosauria using a dataset, which reflects a greatly expanded character set and taxon-sampling regime. Several interesting features of Mahakala omnogovae have implications for deinonychosaurian and avialan character evolution and for understanding patterns of size variation and size change within paravian theropods. These morphologies include the shape of the iliac blade, the triangular obturator process of the ischium, and the evolution of the subarctometatarsalian condition. We present an expanded diagnosis of Mahakala omnogovae, which included following unique combination of characters (autapomorphies noted by *): a ledgelike depression at the confluence of metotic strut and posterior tympanic recess on the anterior face of the paroccipital process*, a posteriorly tapering scapula; a shortened forelimb (humerus 50% femur length); a strongly compressed and anteroposteriorly broad ulna tapering posteriorly to a narrow edge*; elongate lateral crest on the posterodistal femur*; anterior caudal vertebrae with subhorizontal, laterally directed prezygapophyses*; a prominent supratrochanteric process; and the absence of a cuppedicus fossa.

يُعرف dromaeosaurid Mahakala omnogovae من عينة فريدة من الرواسب الطباشيرية المتأخرة لتشكيل Djadokhta في Tögrögiin Shiree، Ömnögov Aimag، منغوليا. تتكون عينة النموذج الشامل من جمجمة محفوظة جيدًا ولكنها جزئية وهيكل عظمي كامل تقريبًا بعد الجمجمة. يتم تضمين Mahakala omnogovae في التحليل الوراثي الشامل لـ Coelurosauria باستخدام مجموعة بيانات، والتي تعكس مجموعة أحرف موسعة بشكل كبير ونظام أخذ عينات من الأصناف. العديد من الميزات المثيرة للاهتمام من Mahakala omnogovae لها آثار على تطور شخصية deinonychosaurian و avialan وفهم أنماط اختلاف الحجم وتغير الحجم داخل الثيروبودات البارافية. تشمل هذه الأشكال شكل النصل الحرقفي، والناتئ السدادي المثلثي للإسك، وتطور الحالة تحت المشطية. نقدم تشخيصًا موسعًا لـ Mahakala omnogovae، والذي تضمن ما يلي مزيجًا فريدًا من الشخصيات (التشوهات الذاتية التي لاحظها *): انخفاض شبيه بالضوء عند التقاء الدعامة الميتية والعطلة الطبلية الخلفية على الوجه الأمامي للناتئ الجانبي القذالي *، لوح الكتف المستدق خلفيًا ؛ طرف أمامي قصير (طول عظم الفخذ بنسبة 50 ٪) ؛ زند مضغوط بشدة وواسع أماميًا خلفيًا مستدقًا خلفيًا إلى حافة ضيقة *؛ العرف الوحشي الممدود على عظم الفخذ الخلفي *؛ فقرات ذيلية أمامية مع نتوءات سابقة للفخذ تحت أفقية وموجهة وحشيًا *؛ عملية بارزة فوق عظم الفخذ ؛ وعدم وجود حفرة مقعرة.

Country
Argentina
Keywords

Evolution, Postcrania, Biochemistry, Gene, Cretaceous, Pelvis, Ischium, https://purl.org/becyt/ford/1.5, Maxilla, Femur, Holotype, https://purl.org/becyt/ford/1, Conservation of Sharks and Rays, Dinosauria, Biology, Taxonomy, Nature and Landscape Conservation, Cretacico, Paleontology, Geology, Biodiversity, Evolutionary Dynamics of Mammals and Their Ancestors, FOS: Earth and related environmental sciences, Humerus, Autapomorphy, Taxonomy (biology), Earth and Planetary Sciences, Scapula, Theropoda, FOS: Biological sciences, Physical Sciences, Environmental Science, Evolutionary History and Diversity of Dinosaurs, Premaxilla, Taxon, Anatomy, Zoology, Dromaeosauridae, Phylogenetic tree

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
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