parasphenoid


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parasphenoid

[¦par·ə′sfē‚nȯid]
(vertebrate zoology)
A bone in the base of the skull of many vertebrates.
References in periodicals archive ?
The pterygoids join anterior to the posterior interpterygoid vacuities, covering the parasphenoid, as in most of the brachauchenine pliosaurids (Williston, 1903; Schumacher et al., 2013; Benson and Druckenmiller, 2014; Paramo-Fonseca et al., 2016).
A new large Pliosaurid from the Barremian (Lower Cretaceous) of Sachica, Boyaca, Colombia/Un nuevo Pliosaurido de gran tamano del Barremiano (Cretacico Inferior) de Sachica, Boyaca, Colombia
From the region of the parasphenoid bone (the parasphenoidale) we highlight the projection of the rostro-parasphenoidal (Rostrum parasphenoidale--RP, Figures.
Phylogeny of the species of Ciconia (Aves, Ciconiidae) based on cranial osteological characteristics
The palate exhibits two interpterygoid vacuities: the anterior interpterygoid vacuity is lanceolate with a pointed anterior and a more rounded posterior margin; the posterior interpterygoid vacuity is more rounded with a slightly pointed anterior end, and is divided longitudinally by the parasphenoid, as is usual in plesiosaurs (Andrews, 1910, 1913).
Stenorhynchosaurus munozi, gen. et sp. nov. un pliosaurido nuevo del barremiano superior (Cretacico Inferior) de Villa de Leiva, Colombia, Suramerica
The parasphenoid is a triradial bone observed in the anterior region of the pituitary fenestra.
Desarrollo embrionario del craneo en la lagartija vivipara Mabuya (Squamata: Scincidae)
The rostral extremity (basi rostri parasphenoidalis, PjP, Figures 10-14) of the parasphenoid region (PS, Figure 10) is larger and more rounded in N.
When decisions on homologous structures cause ambiguous taxa relationships: the Neomorphinae (Aves, Cuculidae) example/ Interpretacoes de homologias primarias e ambiguidade nas posicoes filogeneticas dos taxons: o exemplo nos Neomorphinae (Aves, Cuculidae)
The third synapomorphy concerns the presence of a 'tongue-bite mechanism' with dorsal teeth on parasphenoid, a feature that is homoplasy free within the fishes examined (261: 0 [right arrow] 1).
Teleostean phylogeny based on osteological and myological characters/Filogenia de teleosteos basada en caracteristicas osteologicas y miologicas
[7] Anterolateral process of parasphenoid (Costa 1998a) (CI: 0.16; RI: 0.78): (0) short, free; (1) long, attached to pterosphenoid.
Relationships and taxonomy of the killifish genus Rivulus (Cyprinodontiformes: Aplocheiloidei: Rivulidae) from the Brazilian Amazonas river basin, with notes on historical ecology
owstoni: "Cranium thin and papery; interorbital space and occiput flat, the former about 3.3 times in base of the cranium; preocular, postocular, tympanic and parietal spines present, but small and weak; nuchal spines sometimes present; supraocular and coronal spines absent; cranial ridges absent except for the parietal ridges which are low but never scaled over; parietals separated; mesethmoid processes never directed upward; base of cranium markedly curved; ventral process of basisphenoid feeble, never attached to the parasphenoid; nasal spines low, but strong; preorbital lobes without spines; second suborbital bone much wider than long.
An historical review of Sebastes Taxonomy and Systematics
The toothplates consist of two elements; the basibranchial and parasphenoid. The plates described herein are similar to those tentatively referred to Casierius heckelii by Huggins (1990) from the Trinity Group.
Paleontology of the Glen Rose Formation (Lower Cretaceous), Hood County, Texas
This character is problematic as the definition of 'parasphenoid wings' is not clear.
The phylogenetic position of Nyctiphruretus acudens, a parareptile from the Permian of Russia/Posicion filogenetica de Nyctiphruretus acudens, un parareptil del Permico de Rusia
Vertical, complete laminar bony connection mesially to the eye between frontal, dorsally, and parasphenoid, ventrally.
Teleostean phylogeny based on osteological and myological characters/Filogenia de teleosteos basada en caracteristicas osteologicas y miologicas
Anatomical abbreviations are:a-a, angular-articular; bo, basioccipital; de, dentary; fr, frontal; fv, facet on maxilla for articulation with vomer; ipr, internal (anterior) process of the maxilla; le, lateral ethmoid; mpr, maxillary (posterior) process of the maxilla; rex, maxilla(e); ha, nasal; nc, nutrient canal; pa, parasphenoid; pd, predentary; pmx, premaxilla(e); pn, prenasal; pop, preopercle; pt, pterygoid; qu, quadrate; sph, sphenotic; tr, triangular region of maxilla; vo, vomer.
A fossil skull of the extant blue marlin (Makaira nigricans Lacepede, 1802) from the late Miocene of Orange County, California
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