Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Taxon character matrices database
Hallo,
for a long time I was looking around for a database of character matrices for difficult organisms/taxons. But I didnīt find someone. Is anybody here who knows where I could find such a data collection? Where? Or are there any projects like a "character wiki" or something else? Thanks a lot for your answers Daniel |
#2
|
|||
|
|||
Taxon character matrices database
Daniel wrote:
Hallo, for a long time I was looking around for a database of character matrices for difficult organisms/taxons. But I didnīt find someone. Is anybody here who knows where I could find such a data collection? Where? Or are there any projects like a "character wiki" or something else? Thanks a lot for your answers Daniel TreeBase is what you are apparently looking for, if I understand your request: http://www.treebase.org/treebase/ |
#3
|
|||
|
|||
Taxon character matrices database
Thanks, it is fine (if the server could be connected). But what I was
looking for are character sequences (morphological) for higher taxons like classis, familias, etc. |
#4
|
|||
|
|||
Taxon character matrices database
Daniel wrote:
Thanks, it is fine (if the server could be connected). But what I was looking for are character sequences (morphological) for higher taxons like classis, familias, etc. I'm not sure what you mean by "character sequences". Do you mean lists of synapomorphies? One would of course find this in any published phylogeny based on morphological characters, or if not then an examination of the character matrix and descriptions would give you that information. Some of those are in Treebase. What taxa are you specifically interested in? And the Treebase server was down for a few days but I'm assured that it's working again. |
#5
|
|||
|
|||
Taxon character matrices database
Daniel wrote:
Thanks, it is fine (if the server could be connected). But what I was looking for are character sequences (morphological) for higher taxons like classis, familias, etc. Every flora project has its own format for descriptions, but much depends on the context in which it is used. Descriptions of families are common enough. But nobody makes a description of a class, unless there is dire need. PvR |
#6
|
|||
|
|||
Taxon character matrices database
In message , P. van
Rijckevorsel writes Daniel wrote: Thanks, it is fine (if the server could be connected). But what I was looking for are character sequences (morphological) for higher taxons like classis, familias, etc. Every flora project has its own format for descriptions, but much depends on the context in which it is used. Descriptions of families are common enough. But nobody makes a description of a class, unless there is dire need. PvR The Angiosperm Phylogeny Website has synapomorphies for all sorts of suprafamilial clades - but as often as not some members of the clade have secondarily lost the trait. -- Stewart Robert Hinsley |
#7
|
|||
|
|||
Taxon character matrices database
"Stewart Robert Hinsley" schreef
The Angiosperm Phylogeny Website has synapomorphies for all sorts of suprafamilial clades - but as often as not some members of the clade have secondarily lost the trait. *** Yes, the higher the rank of the taxon, the harder it is to give a description that is true for all its members. Synapomorphies are lost by some members, are not present in the basal members, or are expressed differently in the basal members. Environment often has a major influence on morphology as well. Putting together an accurate description is not only a lot of work, but requires skill and experience. PvR |
#8
|
|||
|
|||
Taxon character matrices database
Ok. I'm looking for a database of morphological character states of
animals, plants, bacteria and their stems, classis, ordos. For example: Animalia Vertebrata Mammalia Marsupialia And for all of these taxons character states. I hope, I could describe my idea as good as possible. Please excuse my bad English knowledges. CU Daniel |
#9
|
|||
|
|||
Taxon character matrices database
Daniel wrote:
Ok. I'm looking for a database of morphological character states of animals, plants, bacteria and their stems, classis, ordos. For example: Animalia Vertebrata Mammalia Marsupialia And for all of these taxons character states. I hope, I could describe my idea as good as possible. Please excuse my bad English knowledges. I don't know of such a thing, per se. If you have access to BIOSIS, put in some search terms like morphology, ultrastructure, phylogeny, and a taxon name. For very deep taxa there are very few morphological characters, and most of these will be ultrastructural -- features of individual cell anatomy. Animals, for example, have gap junctions. You might also check out www.tolweb.org. The references there would be a good source of morphological characters for the various groups. Palaeos is also a good source: www.palaeos.com. Particular databases either exist or are in preparation for some groups. The Archosaur project is preparing one for, obviously, Archosauria and included groups. But I'm not currently finding a web presence for it. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Naming a character (a rebel) after a plant | United Kingdom | |||
TAXON Phrag kovachii articles | Orchids | |||
A Web Designer for do a database for my website? | Permaculture | |||
Orchid Pictures Reference Database Update | Orchids |