Search the Community
Showing results for tags 'tetrapod'.
-
Last year, I drew a Hyneria lindae, based off of recent discoveries and related fish. As soon as I finished it, I started working on a Hynerpeton bassetti, the Ichthyostegoid from the same site that is known from a shoulder girdle and a jaw, and possibly some other material as well. Hynerpeton is known to have been more muscular than Ichthyostega, because of the larger muscle attachments on its cleithrum (shoulder), and at one point was thought to have lost its external gills, but significant doubt has been cast on the evidence for this claim. Hynerpeton's jaw is not as robust as another stegocephalian from the site, Densignathus rowei, which was more derived and muscular. For this reconstruction, the skull (which is covered in skin but fully reconstructed) was based off of Ichthyostega, but the jugal bone was based off of a specimen from Red Hill that has been attributed to Hynerpeton. The shape of this bone affected those around it and suggest slightly different proportions in Hynerpeton than in Ichthyostega, especially concerning the shape of the orbit. The shoulder was incorporated so that the shape of the trunk would be correct, and the foot pads were based off of tetrapod footprints from the Early to Middle Devonian. The lateral line is again based off of its placement of Ichthyostega, as were the scales. In the background, above the water's surface, a forest of Archaeopteris spp. trees and Otzinochsonia beerboweri lycopsids is visible; within the murky river, the red mud that gave Red Hill its name after it was deposited is covered over with plants. This reconstruction is meant to be a sequel to my Hyneria lindae reconstruction I finished about five months ago; unfortunately, I have no specimens of Hynerpeton, which is very rare. If anyone would like to see any citations for the papers that I used in making this reconstructions, please ask below. Enjoy!
- 6 replies
-
- 12
-
- hynerpeton
- hyneria
-
(and 5 more)
Tagged with:
-
An Extensive Exposure of the Wamsutta Formation, North Attleboro
Isotelus2883 posted a topic in Fossil Hunting Trips
In 2004, the oldest flying fossil insect fossil, a trace in the Wamsutta Formation, was described in Nature. The locality was several hundred feet from where an extensive exposure of the formation was located in a cut. I was planning to try and locate the locality, but due to time issues I went back to this cut, which I had visited once before. Several other localities containing abundant plants and ichnofossils are located in the vicinity. Here is an image of a shaly horizon that was between thick conglomeratic layers. There are three of these major ones, with the lower being darker and being more of a sandstone. The middle shale layer. Most of the finds were from here, although the lower member had some complete Cordaites leaves that I forgot to take back. Here are the finds from the lower section. Occasionally, there were smoother sections of bioturbated mud between the sandy shale, where well defined trails were preserved. Some raindrop prints. Here is a possible arthropod print, that is very badly defined. In these higher energy layers, some fragmentary plants were found. A Cordaites? bit was found, with some clasts of quartz just below. Some small pebbles of quartz. Now, here are the plants from the middle shaly layer. A Cordaites? fragment, with several other pieces. A certain layer within the shaly horizon was full of these pieces, however there was little variety and there was little need to fill my shoeboxes with these. Some specimens, showed what seemed like borings on them. Here is the most distinct example. I found these, also on plant fragments at three separate localities in the North Attleboro area, including one of the Rhode Island Formation. In the talus I found a decent, but either badly preserved or badly exposed fern. Just from the shape, there are quite a few possibilities on what it might be. Hee is a quite well defined tetrapod footprint I found in a bioturbated layer of the section, which split readily into relatively thin and flat slabs, which allowed for an examination for prints. However, there is quite a bit missing on the other side of the split. And last, not a fossil but a geological oddity. It is obviously a clast from one of the conglomeratic horizons, but something is weird about it. Inside, are more pebbles. It is a conglomerate, that has weathered out and become, itself, a clast of the Wamsutta conglomerate! The clasts within this pebble are of a quite different nature than the ones in the Wamsutta. Though the finds are not very spectacular, the conglomerate pebble certainly made up for it.- 10 replies
-
- 10
-
- massachusetts
- pennsylvanian
-
(and 3 more)
Tagged with:
-
Hi. We recently underwent some renovations on our house and after wiping off plaster dust on our fireplace slate slab, the following prints were discovered. These are depressions and not handprints from oily skin. The slate slab, more than likely, came from Vermont. My research suggests that slate takes around 300M years to form. Any thoughts on what creature may have created such prints? It is difficult to chalk the prints up to random coincidence, yet the time period for slate to form would suggest early tetrapods. Has anyone found similar prints? Does anyone have any thoughts on what it might be? Appreciate the feedback. Luis
- 15 replies
-
I managed another trip to Aust and as I had a better idea what I was looking for managed to get a few bits of bone bed to sift through back home - one of whch was this nicely preserved piece of what I presume is reptile bone (approx 6cm long?) My guess is a partial rib (although it is completely flat, with no visible curvature), in which case given size and location most probably Pachystropheus, but I'd love to get any more thoughts.
- 48 replies
-
- westbury formation
- tetrapod
- (and 5 more)
-
Some finds from the red hill fossil site. Please note this site is closed to the public and you need a permit from the government to collect here. The fossils are super fragile. I have a Hyneria tooth but it’s drying from being glued. Some of the rocks are green and interesting. Not sure what elements are at play. Hyneria lindae scales Megalichthys mullisoni scales A mystery fossil that came from the same Megalichthys mullisoni body as the scales and tooth Megalichthys mullisoni tooth with jaw mystery scale plates - any ideas on what belongs to who? Mystery plant stems - any ideas ?
-
Evaluation of large Carboniferous tetrapod reveals rapid early growth similar to modern reptiles.
JBkansas posted a topic in Fossil News
"By looking at growth rings in the bones, the team found that Whatcheeria deltae got big fast and then slowed to a more leisurely but steady growth rate. All of the nine specimens they studied were older juveniles and young adults, Otoo said, so it seems that the animals bulked up to around 3.3 feet (1 meter) in length as they neared sexual maturity and then grew larger more slowly in later adulthood. " https://www.livescience.com/tetrapod-predator-growth Original article: https://www.nature.com/articles/s42003-022-04079-0-
- 1
-
- growth rate
- tetrapod
-
(and 2 more)
Tagged with:
-
I was lucky enough last week to be able to make my second donation to the collections of the Field Museum of Natural History in Chicago. This donation consisted of two Mazon Creek finds from the river itself, both collected on the I&M Canal outing last year. The first is an extremely rare tetrapod larva. The second fossil is an exceedingly well-preserved Orthacanthus tooth, featuring serrations in the cusp, a very rare trait for Mazon Creek teeth of this sort. It may prove to be complete as well. I was able to visit the museum to make the donation this time and it was an honor to go behind the scenes and talk to professional paleontologists about these specimens and Mazon Creek collecting. Thanks again to @jdp for helping make this possible!
- 4 replies
-
- 11
-
- field museum
- chicago
- (and 7 more)
-
Lysorophian donated to Field Museum
deutscheben posted a topic in Partners in Paleontology - Member Contributions to Science
Last year @jdp was kind enough to identify the tiny and jumbled skeleton I found in a concretion in eastern Illinois http://www.thefossilforum.com/index.php?/topic/107472-mysterious-jumble-inside-pennsylvanian-concretion/ as a lysorophian tetrapod and direct me to the Field Museum in Chicago as a possible repository for it. This month I finally completed the donation and it has been added to their collection, a fantastic event for someone who has been visiting the museum for more than 30 years to gaze in wonder at their world-class collection. Thank you again to @jdp and The Fossil Forum for making this possible!- 15 replies
-
- 16
-
- pennsylvanian
- illinois
-
(and 4 more)
Tagged with:
-
So here is my 2021 summary of my collecting trips to the late Devonian Catskill formation of Pennsylvania. I have been collecting for the Academy of Natural Sciences in Philadelphia for the past few years. A Tristichopterid skull collected at the Cogan House exit on RT15 in the 2019 season was just described as a new species of Eusthenodon in JVP, Daeschler et. al.. Very exciting! All three trips to PA this year included Red Hill. While the forestry department was very limiting on the use of power tools, they seem to not care too much if people collect with hand tools. The problem is most of the easier surface and near surface material has been collected over the many years the site has been worked. Now, the only way to discover any new tetrapod material is to move large quantities of rock. So that's been the challenge. How much stone can be moved with hammer and chisel with 64 year old wrists? Anyways, I was able to recover a number of interesting specimens although nothing has been id'd as tetrapod so far. These have all been sent to ANSP for analysis. This head plate with what I thought were lateral line canals (Y shape in middle) had a different ornament from other specimens of Hyneria I have. I had also convinced myself the curved surface on the left side and lower image appeared to be orbits but the experts determined it to be just a run of the mill Hyneria post parietal shield. ….It was exciting for a while. Even though this endochondral bone was found in with some exceptionally well preserved material it must have experience some significant transport before being deposited. With a thin blade at the top and some hefty bone at the bottom, I thought this might be id'able but no such luck. I still feel like it must be a shoulder girdle. Not sure what else it could be?? This is another endochondral bone found closely associated with the others. It is minimally a mesomere element of a fin but compares well with the radius of Ichthyostega (see below). Unfortunately, it again being an isolated element has not been id'd at this point. Unfortunately, this mesomere element split when I was removing the head plate. It seems to compare well with an ulna/tibia from a sarcopterygian fin. Here it is with the above "radius"? Finally, the one id'd significant fossil from the season! This bone was found at the Cogan House exit on RT 15. Ted Daeschler was pretty quickly able to id it as a lungfish lower jaw, probably something like Soederbergia.
- 8 replies
-
- 13
-
- late devonian
- red hill
-
(and 3 more)
Tagged with:
-
Hi. I have absolutely no information on this particular specimen. It was picked out of a group of fossil fish most of which were Eocene in age. I suspect it might be Osteolepis but really I have no idea! Any observations would be most appreciated. Thanks.
-
Another driveway find. Is this a sponge of some kind or possibly and bone from dorsal fin? Kind of looks in the shape of the ulna i cant find any reference on what an isolated one looks like. Can bones be calcified like this? i have no idea.
-
New to geology, so excuse my paltry terminology. Description: Tubes, many branching, between 1-3cm in diameter, in places as thick as a forest root system, material very sandstone-y, surrounding material clay. from my research these seem like burrow casts of... worms? tetrapods? do burrow casts form in such abundance?
-
Sources on the relation between modern Lissamphibia and stem tetrapods
Mahnmut posted a topic in Questions & Answers
Hello together, I am looking for papers about the relation between modern amphibians and stem tetrapods (this time not for model building purposes but for an academic paper I write on amphibians as model organisms ( I have the medical topics covered but wanted to include a bit of palaeontology). Also, is there any hint in the fossil record on limb regeneration like some modern amphibia can do? Thanks, J- 5 replies
-
- amphibia
- lissamphibia
-
(and 4 more)
Tagged with:
-
A new discovery of a 375 million year old Tetrapod called Parmastega aelidae with some very unique features from the Komi Republic. http://www.sci-news.com/paleontology/devonian-tetrapod-parmastega-aelidae-07730.html Thought some of you might find this interesting.
-
From the album: Mazon creek assortment
Confirmed by field museum as a tetrapod, species uncertain.-
- unknown
- mazon creek
-
(and 1 more)
Tagged with: