Definition, Meaning & Synonyms | English word POSTORBITAL

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Definitions of POSTORBITAL

1. Behind the orbit of the eye.
2. A postorbital bone or scale.

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Examples of Using POSTORBITAL in a Sentence

• The jugal and lacrimal bones are the only two remaining from the ancestral circumorbital series: the prefrontal, postfrontal, postorbital, jugal, and lacrimal bones.
• The lacrimal and postorbital bones met to form a thick brow over the eye, as seen in carcharodontosaurids and the unrelated abelisaurids.
• These minks were large and heavily built, with a low sagittal crest and short, wide postorbital processes (projections on the frontal bone behind the eye sockets).
• The cranium was robust, with strong zygomatic and postorbital arches forming the rim of voluminous temporal fossae, separated by a sharp sagittal crest.
• Distinguished by "(1) parietal table strongly projecting laterally at anterior margin of superior temporal fenestra; (2) posterior part of parietal table narrower than in other species of comparable size; (3) postorbital extending anteromedially to meet frontal and parietal, preventing postfrontal-parietal contact".
• Known from a premaxilla, the nasal bones and their horncore, a postorbital bone and a parietal, the specimen Museum of the Rockies 492 was considered to share the medially-converging parietal spikes with the only other specimen of S.
• Eureptilia is characterized by the skull having greatly reduced supraoccipital, tabular, and supratemporal bones that are no longer in contact with the postorbital.
• Possession of the postorbital processes, the reduced, noncontacting premaxillaries, and rather simple shoulder and elbow joints, which is similar to pteropodids, makes them rather a primitive group.
• Orodromeus is distinguished by a palpebral that is at its back attached to the postorbital; a boss on the jugal; a non-fused wrist; and triangular maxillary and dentary teeth with a superficial flat occlusion.
• Where the parietal and the frontal bone make contact, the depression in which the supratemporal fenestra, a skull roof opening, was present, shows a sinuous ridge on the postorbital.
• Head moderate; snout (on the skull) about as long as the diameter of the orbit; interorbital region, in the adult, considerably narrower than the nasal fossa; postorbital arch one third to one half the greatest diameter of the orbit; mandible with the inner edge strongly raised, forming a sharp ridge, which sends off a short perpendicular process at the symphysis; the diameter of the mandible at the symphysis does not exceed the diameter of the orbit.
• The top of the head has several bony ridges, along the edge of the snout (canthal ridge), in front of the eye (preorbital), above the eye (supraorbital), behind the eye (postorbital), and a short one between the eye and ear (orbitotympanic).
• aguadagrandensis was considered the most basal abelisaur described at the time, sharing characters, such as an expansion of the postorbital bone above the orbit and a flange of the same bone inside the orbit, with Abelisauridae and Noasauridae; but it was considered to retain primitive features for Abelisauria, such as an opening in the quadrate bone and a T-shaped postorbital.
• Preserved cranial material includes a partial quadrate, left maxilla, teeth, jugal, lacrimal, nasal (with the namesake crest), postorbital, frontal, prefrontal, parietal, squamosal, and paroccipital process and a portion of the predentary bone.
• The specimen designated as the holotype is MTM Gyn/404 (in the collections of the Magyar Természettudományi Múzeum, Budapest, Hungary) and consists of 450 bones, including portions of the skull (premaxilla, left prefrontal, left lacrimal, right postorbital, jugal and quadratojugal, left frontal, pterygoid, vomer, the right quadrate and a fragment of the left quadrate, basioccipital, one hyoid), an incomplete right mandible, three cervical vertebrae, six dorsal vertebrae, ten caudal vertebrae, ossified tendon fragments, three cerival and thirteen dorsal ribs, five chevrons, the left scapulocoracoid, right scapula, portions of the right manus, a partial pelvis, and more than one hundred osteoderms.
• Measurements are referenced as GLS = Greater Length of Skull, Condylobasal Length (CBL), Least Interorbital Breadth (LIB), Zygomatic Breadth (ZB), Postorbital Constriction (PC), Breadth of Braincase (BB), Length of Maxillary Toothrow (LMxT), Palatial Length (PL), Mastoid Breadth (MB), Length of Mandibular Toothrow (LMdT), Length of Mandible (LM), Width across Upper Canines (CC), and Width across Upper Molars (MM).
• It contains both praemaxillae, the left maxilla, the left jugal bone, the left postorbital, the partial right postorbital, the right quadratojugal, both quadrates, parts of both pterygoids, the right epipterygoid, the processus coronoidei of both lower jaws, the left angular, the right dentary, loose teeth, two neck vertebrae, parts of the back vertebrae, a sacrum, a front tail vertebra, the left shoulder girdle, both humeri, the proximal part of the left ischium, the right thighbone, parts of the right shinbone and the first, second and third metatarsal.
• This genus is characterized by many primitive features of the septomaxilla, the postorbital, the parietal, the interparietal, the basioccipital, the quadrate rami of the pterygoid and the vomers of the skull.
• Throughout ontogeny, the skull of Majungasaurus (more specifically, the jugal, postorbital, and quadratojugal) seems to have become taller and more robust; additionally, the skull bones became more fused and the eye sockets became proportionally smaller.
• Dvinia was a small omnivore possessing a large temporal opening typical of advanced therapsids, with a thin postorbital bar separating the eye from the muscle attachment.

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