Welcome to my Metazoic site! This site discusses the existence of the creatures to come along after humans will be extinct. I first became interested in a world after man when I acquired my first copy of Dougal Dixon's After Man: A Zoology of the Future in 1992. However, I unwittingly created creatures that did not exist from the time I was about 8 years old. But it was after I obtained a copy of that book (now a collector's item) that I decided to take these same creatures I created as a child and make them more realistic in an evolutionary sense. Though it may be hard for a lot of us to grasp, humans will soon become extinct. One of the biggest factors of how this will happen is the current overpopulation rate. Which is why I don't contribute to the population. I created this world with little more than mammals fulfilling all ecological niches with the help of some friends. I even gave the era of the age after man a name, I called it the Metazoic, derived from the words for "After-era" (Meta, meaning after, and zoic meaning era). We are now in the Cenozoic era. To view all the animals I have created since I began this project, you can go to the "Meet the Mammals" section of this site. To discuss your own ideas about what you think will happen in the future world, and share your ideas with others, please feel free to leave a comment.
One more thing, some of you may find this site quite offensive, and you have a right to your own opinion. But please respect my right to have an opinion too. I'm not saying there is no GOD, I believe it was HIM who got the ball rolling. But I believe after that, evolution took over. There is so much more evidence of evolution than there is of creation. Even that going on right under our noses. Other than that, enjoy yourself and visit our many links.
Wednesday, May 20, 2009
Earliest Relative of Monkeys
About the size of a small cat, the animal has four legs and a long tail. It's not a direct ancestor of monkeys and humans, but it provides a good indication of what such an ancestor may have looked like, researchers said at a news conference.
Because the skeleton is so remarkably complete, scientists believe it will provide a window into primate evolution. The animal was a juvenile female that scientists believe died at about 9 or 10 months.
"She tells so many stories. We have just started the research on this fabulous specimen," said Jorn Hurum, of the University of Oslo Natural History Museum, one of the scientists reporting the find.
The unveiling, at New York's Museum of Natural History, was promoted by a press release for the cable TV show History, which called it a "revolutionary scientific find that will change everything."
Mayor Michael Bloomberg, among the speakers at the news conference, called it an "astonishing breakthrough."
The story of the fossil find will be shown on History, which is owned by A&E Television Networks. A book also will be published.
Hurum saw nothing wrong with the heavy publicity which preceded the research's publication Tuesday in the scientific journal PLOS (Public Library of Science) One.
"That's part of getting science out to the public, to get attention. I don't think that's so wrong," Hurum said.
Monday, May 11, 2009
Family of the Week: the Shrubucks
The largest member of this family is Mananasus, which is a large forest-dwelling shrubuck that has a long, flexible nose like a modern elephant. They stand about 10 feet tall, and with the long proboscis, can reach leaves an extra 4 feet above their head. This species often will stand on their hind legs to attempt to reach higher leaves. This is the one species that is fully vegetarian, feeding only on leaves and fruits from high branches. Most other shrubucks are omnivores. Ungulascelides is known to scavenge kills from other animals, acting rather like modern jackals in the early Metazoic era. The smallest of the shrubucks is in the genus Varicares. These are rather small animals, and most shelter in burrows. In the early Metazoic, these animals take the place of warthogs. Though they are not quite as ugly. The legs are shorter in this genus than any other variety of shrubuck. This is also the only one of the shrubucks that made it out of Africa. One variety lives in the mountainous forests of southern Europe. This animal feeds on low growth vegetation, as well as insects, earthworms, slugs, grubs and carrion. They live in smaller family groups, much like wild boar today, and all members of the family roost in large burrows dug by the adults in the family.
These animals are like most others around during the Metazoic, they are diurnal. They prefer to roost at night, and do their hunting and traveling during the day. They live in a variety of habitats, but most species prefer drier areas. Though there are quite a few species in this family that are forest and even jungle dwellers. Females usually have more than one calf, and are quite protective of them. Males play very little in the way of family life. Though they too are defensive of their families.
Shrubucks have several enemies. Mostly large reptiles like crocodiles and pythons. Pythons normally take the young animals. Rarely, if ever, any adults. Carnivorous rats and squirrels will also take on these animals as well as wild dogs. Shrubucks defend themselves quite well by way of powerful kicks. The tail also acts as a defensive mechanism. The tail is long and thick, and excellent for slapping at an attacker. Though most predators find a way around this. These animals are the start of a line of animals that would later in the Metazoic become the Choerocaballids, the therapeds and even the deinognathids. But their most unique and unusual descendants will be the sinecrus, that take to the water.
Sunday, May 10, 2009
Attack of the Synapsids
The reason I put the "Triassic" of this timeline in quotes is, quite simply, because there isn't one in this time period. In the XenoPermian, the volcanic eruptions that caused the P-T extinction never happened, or were at least spread out over many millions of years. As a result of this, the Permian bleeds smoothly into the Triassic. Actually, the Triassic being consumed by the Permian would be a better word, since a lot of the fauna that characterize the Permian never goes extinct (gorgonopsids, for one) and a lot of the fauna that characterize the Triassic never evolves (nothosaurs, placodonts, for example).
So, here are the two links. Zach's picture can be found here (http://blogevolved.blogspot.com/2009/05/long-road-to-failure.html), and Will's post is located here (http://thedragonstales.blogspot.com/2009/05/welcome-to-xenopermian.html)
Friday, May 8, 2009
Shuvosaurus and Protoavis: Two Enigmas From the Triassic of Texas
While Shuvosaurus was unusual, it paled in comparison to the controvery stirred up by Chatterjee's other discovery, Protoavis. Protoavis was described as a fossil Triassic bird by its discoverer, a creature about 35 centimeters tall. Even more unusual, several features that Chatterjee described in Protoavis would suggest that it is more advanced than the earliest definite known bird, Archaeopteryx, despite living 75 million years earlier. One of these features is that Protoavis has a very bird-like skull, with teeth even more reduced than in Archaeopteryx. Some scientists have called the validity of Protavis into serious question, but Chatterjee has stood by his claim.
Enter the drepanosaurids. Drepanosaurids, more informally known as monkey lizards, were a group of arboreal reptiles that have been found across the world during the Triassic period (for more info on drepanosaurs see the excellent post at the Hairy Museum of Natural History here http://www.hmnh.org/galleries/monkeylizards/index.html). Some species appear to have taken the place of squirrels or primates, others may have lived a life like the modern tamandua, and still others may have even been aquatic or flying squirrel-like animals. But most importantly, these animals had a very bird-like skull, to the point where one of their "other" names is avicephalans (bird heads). The best specimens of these animals have been found in the Eastern U.S. (Hyperonector) or Italy (Drepanosaurus and Megalancosaurus), but there is a species of drepanosaurid known from the American Southwest, Dolabrosaurus, found in the sediments of Petrified Forest National Park.
Tuesday, May 5, 2009
Pleurocoelus No More
Neither did sauropods just leave North America in the hands of the iguanodonts and nodosaurs. While the diplodocids did go extinct in North America after the Late Jurassic, the continent was still overrun by titanosaurs and their kin, the little buggers. There was Sauroposeidon, essentially an Early Cretaceous version of Brachiosaurus on steroids. There was also smaller titanosaurs, like Venenosaurus. But I would like to focus your attention to the dinosaurs oftentimes described as "Pleurocoelus"
The first fossil ever to be attributed the name Pleurocoelus were some fossils found about 1859 in the Arundel Formation of Maryland. However, it was not called Pleurocoelus at all, rather it was named Astrodon. Discovered by Christopher Johnson at this time, who coined the name, Astrodon really did not enter the paleontology lexicon until 1865, when Joseph Leidy described the species and attributed a species name to it, johnstoni, after its discoverer. So why Pleurocoelus then? Well, some years later, more sauropod specimens that looked exactly like Astrodon were brought to Othniel Marsh, who rather than follow the rules and refer them to Astrodon, created his own taxon for them, Pleurocoelus. This actually happened quite often between Cope and Marsh, neither would accept names coined by each other or other paleontologists, and so made up their own names. Over the years, numerous other taxa were attributed to the genus Pleurocoelus, from places as far away as Texas and Utah. Before long Pleurocoelus became a wastebasket taxon, a taxon to which numerous different remains are attributed.
For a long time, sauropod fossils found in Texas have been referred to as Pleurocoelus. These include the famous "sauropod vs. Acrocanthosaurus" footprints of Glen Rose. However, it soon became apparent that there were some differences between the supposed "Pleurocoelus" specimens of Texas and Maryland. For example, the Texas specimens apparently lacked a claw on one of their digits, making their feet rather distinct. These were not "Pleurocoelus", they were a species all their own. In 2007, the Texas fossils of "Pleurocoelus" were redescribed as a new genus, Paluxysaurus jonesi. Like Astrodon and other former members of "Pleurocoelus", Paluxysaurus is a basal titanosauriform, a group that was quite common across North America during the Early Cretaceous.
And what of Astrodon, the "original" specimen of Pleurocoelus? Well, in a study done by Kenneth Carpenter and Virginia Tidwell, they found that Astrodon was indeed a unique species, and that the name Astrodon should be kept, per ICZN legislation. In addition, the study found that there were differences between the supposed "Pleurocoelus" teeth from Texas differed from those of Astrodon.
So what does this mean for Early Cretaceous paleobiology? Well, rather than one sauropod as expected, it now seems that there were two sauropods running around in Early Cretaceous North America (in addition to the other sauropods, such as Sauroposeidon). First there was Astrodon, a somewhat smaller coastal-dwelling sauropod. Then there was the larger Paluxysaurus, who lived more to the west and inland of the East Coast dwelling Astrodon.
Ironically, there is a final twist to our story. While most of the Texas sauropod fossils known can probably be attributed to Paluxysaurus, one; a partial skeleton from Wise County, Texas, cannot. There has not been a study done yet comparing the Paluxysaurus holotype, but there appear to be some differences in the bone. But at the same time, it is difficult to tell these Pleurocoelus remains apart from those of Paluxysaurus.
Carpenter, K. and Tidwell, V. 2005. Reassessment of the Early Cretaceous sauropod Astrodon johnstoni Leidy 1865 (Titanosauriformes)
Rose, Peter J. (2007). "A new titanosauriform sauropod (Dinosauria: Saurischia) from the Early Cretaceous of central Texas and its phylogenetic relationships" (web pages). Palaeontologia Electronica 10 (2). http://palaeo-electronica.org/2007_2/00063/.
Jacobs, L. 1995. Lone Star Dinosaurs. Texas A&M University Press, College Station, Texas
Fraser, N. 2006. Dawn of the Dinosaurs, Life in the Triassic. Indiana University Press