I suppose the other logical possibility would be in Bob Bakker's possession, as the original lead researcher. For example, in the dentary, there are: Carpenter and Galton prefer including Dysalatosaurus lettowvorbecki in Dryosaurus, and also consider the generic-level distinctiveness of Eousdryosaurus nanohallucis to be questionable. Dryosaurus elderae; the generic name is a combination of the Ancient Greek "drys" referring to "oak" or "forest", apparently for the inferred environment of the animal, and "sauros" for "lizard", and the species name honors the late Ann Elder , a National Park Service paleontologist and geologist who worked at Dinosaur National Monument. You can think of N. The revenge of Nanosaurus agilis When we last checked in with Nanosaurus agilis, it was a historical curiosity known from a single specimen limited more or less to bone impressions. If someone else wants to take them on, they aren't going anywhere. Most of the skeleton was discovered in March , with the head and partial neck found later.
I suppose the other logical possibility would be in Bob Bakker's possession, as the original lead researcher. Clipped from Carpenter and Galton's Figure 27; A is CM , the holotype of Dryosaurus elderae, in panel mount form; B is the same specimen in a new freestanding mount. This gives us "Ann Elder's forest lizard". On that basis, it's hard to say that Nanosaurus agilis doesn't deserve serious consideration as the name of record. We spent some time with dryosaurids way back in , and not a lot has changed since then, except I'd extend the Morrison species into the early Tithonian. CM [Carnegie Museum of Natural History, Pittsburgh, Pennsylvania; occasionally the acronym is given in the literature as CMNH instead], a partial articulated skeleton including the skull and lower jaw, six cervicals , thirteen dorsals, the sacrum, rib pieces, the pelvis, the right shoulder girdle and humerus, pieces of the right femur and tibia, the articulated left foot, and three other complete or partial metatarsals. Journal of Vertebrate Paleontology 29 3: Carpenter and Galton find that the various specimens assigned to Drinker nisti, Nanosaurus agilis, and Othnielosaurus consors share a set of characteristics that are unlike those found in the other bipedal Morrison ornithischians Fruitadens haagarorum, Dryosaurus altus and elderae, and Camptosaurus dispar and aphanoectes. In case you were wondering, no word on the other putative bipedal Morrison ornithischians Brachyrophus altarkansanus, Laosaurus celer, L. The second part of their argument, that the Morrison "hypsilophodonts" should all be Nanosaurus agilis, may be harder to accept given the admittedly poor quality of the N. Minnesota paleontology and geology, National Park Service paleontology, the Mesozoic, and occasional distractions Sunday, August 26, Dryosaurus elderae and the revenge of Nanosaurus agilis It's been a busy few days over at The Compact Thescelosaurus , with new alvarezsaurs , nodosaurs , and dryosaurs. Figure 2 from Carpenter and Galton , showing the distribution of bipedal Morrison ornithischians. Gently convex ventral border of dentary Anterior dentary teeth slightly procumbent lean forward Widely spaced posterior dentary teeth Tooth roots well exposed Dentary tooth row continuing almost to the symphysis the joint at the front Triangular crowns wider than the roots Coronoid process the part that sticks up inline with tooth row rather than offset laterally Figure 7 from Carpenter and Galton , showing various jaws of the Morrison "hypsilophodont" A through K with Fruitadens L , Dryosaurus M , and Camptosaurus N for comparison. Carpenter and Galton come to a new conclusion that, if you accept it, instantly catapults N. For example, in the dentary, there are: In my opinion Carpenter and Galton have successfully demonstrated that there is basically one Morrison "hypsilophodont", although this doesn't necessarily exclude the possibility of anatomically similar species within the sample, as with the two Morrison species of Camptosaurus and Dryosaurus. For this post, I'm going to focus on Carpenter and Galton , which not only describes new species Dryosaurus elderae, but also is quite important for previous subject Nanosaurus agilis , and in general ticks off several of my boxes anyway "hypsilophodonts", Morrison Formation, National Park Service areas, etc. A keen-eyed observer who's familiar with the Morrison fauna might notice the absence of Drinker nisti and Othnielosaurus consors, and an abundance of Nanosaurus agilis Miscellaneous observations The type material of Drinker nisti could not be located at two institutions where it was supposed to have been at one time or another. Carpenter and Galton prefer including Dysalatosaurus lettowvorbecki in Dryosaurus, and also consider the generic-level distinctiveness of Eousdryosaurus nanohallucis to be questionable. I'm not sure where that would leave the name of this taxon; it could be back to Othnielia rex, or maybe new combination Drinker consors if rex is also thought to not be up to snuff. You can think of N. Dryosaurus elderae Dryosaurus elderae is actually pretty familiar for a new species, because it is based on a skeleton that has long been the public face of Dryosaurus. However, the type of N. If someone else wants to take them on, they aren't going anywhere. The quarry, in turn, is in the middle Brushy Basin Member of the Morrison Formation, and you probably don't need me to remind you that it's Late Jurassic in age. Four other specimens from the quarry have also been assigned to this species, the most significant being a partial juvenile CM , and a braincase CM which had gotten into the holotype of Camptosaurus aphanoectes and made it seem strange enough to warrant a distinct genus for a while Uteodon.
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