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RE: Giant Paleozoic arthropods; Also, SVP field trips
At 03:22 PM 6/29/99 +1000, Adam Yates wrote:
>>Well, the sea scorpions (which actually were probably fresh water
>>and could move on land) got over six feet!.
>The aquatic Sea Scorpions were not true scorpions, they were chelicerates
>whose closest modern relatives are the horseshoe crabs.
Actually, although eurypterids ("sea scorpions") are not true scorpions, the
monophyly of Merostomata (eruypterids + xiphosurans ("horseshoe crabs")) is
suspect. For example, in Willis et al., eurypterids are closer to arachnids
(including scorpions) than are modern limulids (modern horseshoe crabs),
while other Paleozoic "xiphosurans" are outside that clade. Selden & Dunlop
(in the same volume) also place eurypterids as closer to arachnids than to a
(there monophyletic) Xiphosura.
Willis, M. A., D. E. G. Briggs, R. A. Fortey, M. Wilkinson & P. H. A.
Sneath. 1998 An arthropod phylogeny based on fossil and recent taxa. In
Edgecombe, G. D. (ed.) Arthropod Fossils & Phylogeny. Columbia Univ. Press.
Of course, I want to point out that Eurptyerida was long extinct before the
dinosaurs (the subject of this list) were ever around!
So, in order to help justify this message on the dinosaur list, I just
received my copy of the second circular for the 1999 Society of Vertebrate
Paleontology meeting. It includes the field trips, four of which are
directly tied in to dinosaur studies. These are:
Upper Triassic Stratigraphy and Paleontology of the Eagle Basin, Colorado
The Can~on City Dinosaurs Sites of Marsh and Cope; and the Indian Springs
In the Steps of the Dinosaurs: A Tour of dinosaur Ridge
Tracing the Cretaceous-Tertiary Faunal Transition in a Catastrophically
For more info, check out the SVP website:
If you've never been out in the western U.S. (or if you have and you've
never seen fossils in situ), and you are going to the meeting, I'd recommend
you think about taking one of these trips.
Thomas R. Holtz, Jr.
Deptartment of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Webpage: http://www.geol.umd.edu Phone:301-405-4084
Email:firstname.lastname@example.org Fax: 301-314-9661