| neosychnocotyle maggiae, n. gen., n. sp. (platyhelminthes: aspidogastrea) from freshwater turtles in northern australia. | neosychnocotyle maggiae, n. gen., n. sp., (aspidogastrea) is described from the pig-nosed turtle, carettochelys insculpta, and reported from the victoria river red-faced turtle, emydura victoriae, all from the daly river, northern territory, australia. neosychnocotyle n. gen. is differentiated from all aspidogastrean genera but one by the absence of a cirrus sac. the similar sychnocotyle also lacks a cirrus sac, but neosychnocotyle n. gen. differs from the former genus by possessing a narrow, ta ... | 2007 | 17539425 |
| stable cretaceous sex chromosomes enable molecular sexing in softshell turtles (testudines: trionychidae). | turtles demonstrate variability in sex determination ranging from environmental sex determination (esd) to highly differentiated sex chromosomes. however, the evolutionary dynamics of sex determining systems in this group is not well known. differentiated zz/zw sex chromosomes were identified in two species of the softshell turtles (trionychidae) from the subfamily trionychinae and z-specific genes were identified in a single species. we tested z-specificity of a subset of these genes by quantit ... | 2017 | 28186115 |
| adaptive patterns of mitogenome evolution are associated with the loss of shell scutes in turtles. | the mitochondrial genome encodes several protein components of the oxidative phosphorylation (oxphos) pathway and is critical for aerobic respiration. these proteins have evolved adaptively in many taxa, but linking molecular-level patterns with higher-level attributes (e.g., morphology, physiology) remains a challenge. turtles are a promising system for exploring mitochondrial genome evolution as different species face distinct respiratory challenges and employ multiple strategies for ensuring ... | 2017 | 28591857 |
| modelling development of reptile embryos under fluctuating temperature regimes. | an increase in temperature, within bounds, will accelerate development of reptile embryos, and morphogenesis can be normal over a range of temperatures despite those varying rates of development. less well understood is the form of the relationship that best describes variation in developmental rate with temperature. in this article, we apply a linear degree.hour model, an empirical curvilinear model, a biophysical model, and a polynomial model to data on rates of embryonic development and tempe ... | 2005 | 15702459 |
| a new species of freshwater turtle of the genus elseya (testudinata: pleurodira: chelidae) from the northern territory of australia. | the genus elseya has had a checkered taxonomic history, but is now restricted to species characterized by an alveolar ridge on the triturating surfaces of the jaw. the australian forms were once regarded as a single widespread species extending from the mary river of south-eastern queensland to the fitzroy river of north western australia, but a number of australian species have now been identified based on a combination of molecular and morphological data-elseya dentata, e. irwini, e. lavaracko ... | 2016 | 27395476 |
| forelimb kinematics during swimming in the pig-nosed turtle, carettochelys insculpta, compared with other turtle taxa: rowing versus flapping, convergence versus intermediacy. | animals that swim using appendages do so by way of rowing and/or flapping motions. often considered discrete categories, rowing and flapping are more appropriately regarded as points along a continuum. the pig-nosed turtle, carettochelys insculpta, is unusual in that it is the only freshwater turtle to have limbs modified into flippers and swim via synchronous forelimb motions that resemble dorsoventral flapping, traits that evolved independently from their presence in sea turtles. we used high- ... | 2013 | 23125335 |
| forelimb muscle function in pig-nosed turtles, carettochelys insculpta: testing neuromotor conservation between rowing and flapping in swimming turtles. | changes in muscle activation patterns can lead to new locomotor modes; however, neuromotor conservation-the evolution of new forms of locomotion through changes in structure without concurrent changes to underlying motor patterns-has been documented across diverse styles of locomotion. animals that swim using appendages do so via rowing (anteroposterior oscilations) or flapping (dorsoventral oscilations). yet few studies have compared motor patterns between these swimming modes. in swimming turt ... | 2013 | 23966596 |