WebMar 12, 2024 · Like dolphins, most ichthyosaurs are believed to have given birth to live young, rather than laying eggs like contemporary land-bound reptiles. (How do we know this? The specimens of some ichthyosaurs, … WebBut they nevertheless did this in a way similar to some living sharks–they laid the eggs inside themselves, and hatched them inside. So they were not viviparous, as mammals, …
Did plesiosaurs lay eggs on land? - Daily Justnow
WebJun 21, 2024 · Compelling evidence (such as tiny embryos fossilized inside the bodies of their mothers) leads paleontologists to believe that most, if not all, ichthyosaurs gave … Ichthyosaurs were viviparous, i.e. bore live young instead of laying eggs. Although they were reptiles and descended from egg-laying, oviparous , ancestors, viviparity is not as unexpected as it first appears. See more Ichthyosaurs (Ancient Greek for "fish lizard" – Ancient Greek: ἰχθύς, romanized: ichthys, lit. 'fish' and Ancient Greek: σαῦρος, romanized: sauros, lit. 'lizard') are large extinct marine reptiles. Ichthyosaurs belong to the order … See more This taxonomy was presented by Michael Werner Maisch in his 2010 review of ichthyosaur classification. • Clade Ichthyopterygia (sensu Motani (1999)) See more Size Ichthyosaurs averaged about 2–4 m (6.6–13.1 ft) in length. Some individual specimens were as short as 0.3 m (1 ft); some species were much larger: the Triassic Shonisaurus popularis was about 15 m (49 ft) long … See more Early finds The first known illustrations of ichthyosaur bones, vertebrae, and limb elements were published by the … See more Origin The origin of the ichthyosaurs is contentious. Until recently, clear transitional forms with land-dwelling vertebrate groups … See more In modern phylogeny, clades are defined that contain all species forming a certain branch of the evolutionary tree. This also allows one to … See more Ecology Apart from the obvious similarities to fish, ichthyosaurs also shared parallel developmental … See more slush puppy party pack
Transition from egg-laying to live-born – Harvard Gazette
WebJul 7, 2024 · Because of their body structure, researchers had suspected that mosasaurs did not haul themselves out onto a beach to lay eggs, similar to how sea turtles … WebMar 29, 2012 · If this scenario sounds confusing, it is important to know that ichthyosaurs, extinct marine reptiles that lived at the same time as the dinosaurs, did not lay eggs but … WebSep 16, 2009 · Having drawn this link in three lineages of extinct marine reptiles — mosasaurs, sauropterygians, and ichthyosaurs — the scientists say that genetic, or chromosomal, sex determination may have played a surprisingly strong role in adaptive radiations and the colonization of the world’s oceans by a diverse array of species. solar panels for your roof