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Topic: Lissamphibia


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  Lissamphibia - Wikipedia, the free encyclopedia
Whilst the monophyly of the Lissamphibia is accepted by many herpetologists and paleontologists, the origin and relationships of the various Lissamphibian groups both with each other and among other early tetrapods remains controversial.
Not all paleontologists are convinced that the lissamphibia are indeed a natural group, as the various characteristics are also shared with some Paleozoic amphibians, and it is still possible that these characteristics evolved independently.
Currently there are three prevailing theories of Lissamphibian origin: monophyletic within the temnospondyli, monophyletic within lepospondyli, and diphyletic (two separate ancestries) with apodans within the lepospondyls and salamanders and frogs within the temnospondyli.
en.wikipedia.org /wiki/Lissamphibia   (439 words)

  
 Classification & Natural History of Amphibians
But these amphibians that are placed in the subclass Lissamphibia have a -- don't havea continuous tooth, they have a plane of fibrous connective tissue that separates the tooth itselffrom this little bony foundation piece that's down in the jaw.
The term "Lissamphibia" is reference to the fact that they have smooth skin.
The reason that these guys have smooth skin, and that is that they have lost the scales thattheir Labyrinthodonts ancestors must have had, is that they all exchange some significant amountsof oxygen through the skin.
www.csupomona.edu /~dfhoyt/classes/zoo138/CNH_AMPH.HTML   (5346 words)

  
 iqexpand.com   (Site not responding. Last check: 2007-10-07)
This group, which includes all living amphibians, as well as their extinct relatives, goes by two formal names: Lissamphibia or Amphibia.
Of the remaining modern subclass Lissamphibia there are three orders : Order Anura (frogs and toads) (in Superorder Salientia): 5,228 species Order Caudata or Urodela (salamanders): 552 species Order...
Subclass Lissamphibia This group contains the modern amphibians, which probably evolved from labyrinthodonts, having teeth with a fibrous segment between crown and root, an opercular bone, short ribs...
lissamphibia.iqexpand.com   (739 words)

  
 Phylogeny of Stegocephalians
In lysorophians and lissamphibians, the body of the parasphenoid is not much wider than the cultriform process and there is no sharp separation between the body and the cultriform process (Fig.
All the phylogenies mentioned above suggest that extant amphibians form a monophyletic group that is closely related to amniotes.
A phylogenetic investigation of the inter- and intrarelationships of the Lissamphibia (Amphibia: Temnospondyli).
tolweb.org /accessory/Phylogeny_of_Stegocephalians?acc_id=467   (1957 words)

  
 Palaeos Vertebrates 180.100  Lissamphibia
Links: Class Lissamphibia; superordo Lissamphibia (Dutch); Living Amphibians; CHAOYANGIA and LISSAMPHIBIA; Lissamphibia after Milner, 1994, Laurin and Reisz, 1997; 209 lec s02/20908s02.pdf; LissamphibPec; Systematics of the Amphibia; Biology 356; Evolución (Spanish); Herpetology 101 - Suite101.com; Amphibians.
Range: fr J. Phylogeny: Lissamphibia :: Anura + * : Karaurus + Sirenidae.
Range: fr P? Phylogeny: Lissamphibia :: Urodela + *.
www.palaeos.com /Vertebrates/Units/Unit180/180.100.html   (1667 words)

  
 On the origin of and phylogenetic relationships among living amphibians -- Zardoya and Meyer 98 (13): 7380 -- ...
(a) Temnospondyli as sister group of Lissamphibia (Gymnophiona basal to Caudata and Anura) (13, 40).
Gymnophiona is the sister group of Caudata to the exclusion of Anura (15, 25, 26).
Although monophyly of the Lissamphibia is widely accepted, it is still controversial whether the extinct temnospondyls (Fig.
www.pnas.org /cgi/content/full/98/13/7380   (2767 words)

  
 fossil groups, amphibia, modern forms.
While these three groups vary greatly in appearance they are all placed in the same clade, Lissamphibia (means smooth skin), since they share a number of characters.
Temnospondyl theory - that the Lissamphinia form a natural group with dissorophoid temnospondyls as their stem.
Microsaur theory - that the Lissamphibia form a natural group with microsaurs and lysorophians as their stem.
palaeo.gly.bris.ac.uk /Palaeofiles/Fossilgroups/Amphibia/modernforms.html   (473 words)

  
 ScienceDaily: Timeline of evolution   (Site not responding. Last check: 2007-10-07)
Dinosaurs survive the extinction and grow to large size, but the thecodonts, or "socket-toothed" reptiles, die out.
Modern amphibians evolve: the Lissamphibia; including Anura (frogs), Urodela (salamanders), and Caecilia.
Geminiviridae, a diverse group of viruses, are traceable to this epoch or earlier
www.sciencedaily.com /encyclopedia/timeline_of_evolution   (6577 words)

  
 Updates of 30th March 2003
Some upkeeping for genus Rana [Tetrapoda: Lissamphibia: Salientia: Ranidae: Rana] done.
Revision of the genus Scinax [Tetrapoda: Lissamphibia: Salientia: Hylidae:].
Revision of basal frog phylogeny [Tetrapoda: Lissamphibia: Salientia: Discoglossidae].
www.fmnh.helsinki.fi /users/haaramo/updates/2003-03-30.html   (1137 words)

  
 Chap 2 Qs
Describe the functional and anatomical changes that occurred that are associated with the evolution from aquatic to terrestrial lifestyles.
What are the shared derived characters associated with Lissamphibia?
Why is the phylogenetic position of turtles controversial (e.g., why can’t we agree upon a phylogenetic hypothesis for this group)?
www.bsu.edu /web/temorrell/chap_2_qs.htm   (152 words)

  
 Early Land Vertebrates
Cowen (2000) states that the Temnospondyls were "the largest and most diverse group of early" tetrapods or "amphibians" (40 families and 160 genera), and they seem to be the group from which some or all modern amphibians (Lissamphibia -- frogs and salamanders) evolved in the late Paleozoic or Triassic.
The fossil record for modern amphibians (Lissamphibia) begins in the Jurassic, which is later than that for mammals and dinosaurs.
East Kirkton in Scotland with Temnospondyl fossils from 336 Ma in the middle Carboniferous is a key source of fossils including "Lizzy," the earliest amniote (see p.
www.geo.brown.edu /geocourses/QE/fr/classtopics/Evolutio/LandVert.htm   (1126 words)

  
 Introduction to Amphibians   (Site not responding. Last check: 2007-10-07)
The word Lissamphibia contains liss = smooth, referring to the smooth skin;
The three orders of Lissamphibia: caecilians (1), urodeles (2) and anurans (3).
Pedicellate teeth, a derived trait common to all extant amphibians.
www.fiu.edu /~acaten01/conlis2.html   (231 words)

  
 Chapter 9 Review
The lobe-fin fish clade (Sarcopterygii) includes a tetrapod subgroup (Tetrapoda), which likewise has subgroups Lissamphibia (frogs, salamanders, etc.) and Amniota (reptiles including birds plus mammals).
The fish closest to land vertebrates are "lobe fin fishes" suh as coelacanths, lungfishes, and early aquatic members of the clade, Ostieolepiformes, such as Osteolepis (review figures on pp.
Salamanders, frogs, and other living "amphibians" are in a quite derived lineage of tetrapods, called Lissamphibia.
biology.fullerton.edu /life/hol/rq/rq9.html   (764 words)

  
 Untitled
There are considered to be three orders of amphibians or Amphibia which have been placed in the subclass Lissamphibia.
These three groups are associated in the Lissamphibia by characteristics of tooth, skin, and fat body structure.
Vertebral and skull structure, as well as other characteristics, differ considerably among the three groups.
www.suite101.com /print_article.cfm/amphibians_and_reptiles/43715   (740 words)

  
 New AMAZING Lissamphibia Information   (Site not responding. Last check: 2007-10-07)
Do not stop explore ALL of the Lissamphibia information here.
For your convenience, we've gathered hundreds of Web Sites Offering information about "lissamphibia" and ranked them according to relevancy.
Read about Lissamphibia in the free online encyclopedia and dictionary.
anstice.blogmobs.com /.../Ultrasound/Pet/Lissamphibia   (321 words)

  
 Amphibian Systematics
First, see if you can duplicate his results.
Second, constrain temnospondyls and Lissamphibia to be a clade and analyze the data set under that constraint.
Third, get down and funky and do something interesting with the data matrix.
www.zo.utexas.edu /courses/amphsyst/Lecture1.html   (856 words)

  
 Search Results for monophyletic - Encyclopædia Britannica
The Lissamphibia is a well-corroborated monophyletic group containing all the living orders of amphibians.
However, the placement of the Lissamphibia within an overall classification of the Amphibia...
Expand your search on monophyletic with these databases:
www.britannica.com /search?query=monophyletic&submit=Find&source=MWTEXT   (293 words)

  
 New AMAZING Lissamphibia Information   (Site not responding. Last check: 2007-10-07)
Free acne advice information that's hard to find.
Top 10 Web Sites for Information about "lissamphibia"
Orders Anura Caudata Gymnophiona Allocaudata The Subclass Lissamphibia includes all recent amphibians.
anstice.blogmobs.com /ansticewp_comments_post/Ultrasound/Pet/Lissamphibia   (321 words)

  
 Definition of lissamphibia - Merriam-Webster Online Dictionary   (Site not responding. Last check: 2007-10-07)
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For More Information on "lissamphibia " go to Britannica.com
Get the Top 10 Search Results for "lissamphibia "
www.bonus.com /contour/merriam_webster/http@@/www.m-w.com/dictionary/lissamphibia   (85 words)

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