The Complete Dinosaur - James Orville Farlow, Michael K. Brett-Surman rEvolution - online games for biology students rEvolution is a collection of online games, designed by the Centre for Applied Research in Educational Technologies (CARET) and departments of biological science at the University of Cambridge, to introduce and reinforce key concepts in biology, ecology and plant science. They might make enjoyable activities for your science students at the end of term, as a plenary, or for a STEM science club. What strategies do plants need to survive and reproduce - and how are they different for wild and cultivated plants? Play the game A fun way to remind students about the role of phloem and xylem in plants. Play the game This game looks at how plants have evolved seeds dispersed by the wind, and compares how easily different designs of seed can colonise a landscape. Play the game Before playing the seed dispersal game, you may want to try out the seed dispersal quiz. How do plants evolve to suit their surroundings? Play the game Race to direct grains of pollen into the eggs Play the game Play the game
The Age of Dinosaurs in South America - Fernando E. Novas Pterosaur Wings Pterosaur wing origins It has been said that pterosaurs appeared suddenly in the fossil record with no apparent precursors. Unfortunately, this is the belief of those who still believe pterosaurs are archosaurs. No series of archosaurs has ever been put forth that demonstrates a gradual evolution of pterosaurian characters, hence the paradigm mentioned above. Lepdiosaurian fenestrasaurs (Peters 2000, 2009) do demonstrate a gradual evolution of pterosaurian characters, no matter which characters one chooses. 1.7 Illustrates the basal lepidosaur, Sphenodon. 1.1 Illustrates the basal squamate Huehuecuetzpalli. 1.2 Illustrates the basal fenestrasaur, Cosesaurus. 1.3 Illustrates Sharovipteryx. 1.4 Illustrates Longisquama. 1.5 and 1.6 Ilustrate the derived fenestrasaur and basal pterosaur, MPUM 6009. A recent paper on pterosaur wing shape (Elgin, Hone and Frey 2010) purported to show that all pterosaur wing membranes attached at the tibia or ankle (see below).
Perhaps the Propatagium IS the Longus Metacarpal Extensor in Pterosaurs | The Pterosaur Heresies Flexion and Extension in Pterosaur Wings Workers have been looking for evidence of a wing finger extensor muscle/tendon in pterosaurs without much success. For some the longus metacarpal extensor would be the most likely wing finger extensor in pterosaurs. The flexor digitorum longus has been promoted as the most likely wing finger flexor in pterosaurs. Both of these muscles originate on the distal humerus in most tetrapods and terminate on the proximal phalanges. Figure 1. Bennett (2008) Flips Things Around The above soft tissue restoration by Bennett (2008, Fig. 1) is based on several strange morphological changes that would have made pterosaurs different than all other tetrapods. As an aside, Bennett (2008) mistakenly illustrated (Fig. 1) digit 3 above digits 2 and 1 in dorsal view, but promoted the opposite configuration (1 dorsal to 2 and 3, illustrated here) in his text. Figure 2. Have We Overlooked the Propatagium? Figure 3. Figure 4. This model agrees with the fossil record.
hallett_dino_web das_reich_der_tiere8 das_reich_der_tiere6 das_reich_der_tiere2 Dinosaur Drawings and the Rest by IDougDinosaurs List of extinct mammals A large number of prehistoric mammals are extinct, such as Megafauna. See List of prehistoric mammals. This is an incomplete list of historically known extinct mammals, their dates of extinction, and former range. Mammals included are organisms which have been described by science, but which have subsequently become extinct. Many of these animals have become extinct as a result of human hunting, for food or sport, or through the destruction of habitat. Marsupials[edit] Sirenians[edit] Steller's Sea Cow (1768), Commander Islands Rodents[edit] Ungulates[edit] Cebu Warty Pig (2000, Philippines) Lagomorphs[edit] Proboscids[edit] Tubulidentata[edit] Bibymalagasia (200 BCE, Madagascar) Soricimorphs[edit] Bats[edit] Cetaceans[edit] Chinese River Dolphin Baiji (2006, China) (officially listed as functionally extinct; it is possible that a few aging individuals still survive) Artiodactyls[edit] Aurochs Carnivores[edit] Javan Tiger, pictured 1938 Subspecies Primates[edit] Koala lemur (1500, Madagascar) See also[edit]
Dinosaurs for Kids | Dinosaur Toys - Everything Dinosaur dinosaurs a celebration 2