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Topic: Batoidea


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In the News (Mon 30 Nov 09)

  
  ray, in zoology. The Columbia Encyclopedia, Sixth Edition. 2001-05
Rays feed on a variety of smaller animals; the heavy, rounded teeth of most species are adapted to crushing the shells of snails and clams.
The rays, which form the order Batoidea, are divided into seven families.
Rays are classified in the phylum Chordata, subphylum Vertebrata, class Chondrichthyes, subclass Elasmobranchii, order Batoidea.
www.bartleby.com /65/ra/ray1.html   (615 words)

  
 Article 4 - Frisk et al.: content
For the species in the superorder Batoidea, 12 had the greatest elasticity of λ to changes in matrix elements for the adult stage and 3 for the juvenile stage.
for species from the superorder Batoidea are similar to those found for Galea, with increases in the adult stage having large positive impacts and changes in the juvenile stage and the transitional stages and fertility element having negative effects (Fig.
For Batoidea and Galea species, the sensitivity of elasticity of species for the juvenile stage was positive, indicating that increased survival would have a positive effect on e
journal.nafo.int /35/frisk/frisk-main.html   (5655 words)

  
 CSIRO PUBLISHING - Marine & Freshwater Research   (Site not responding. Last check: 2007-09-17)
Representatives were karyotyped from the superorders: Galeomorphii (4 orders), Squalomorphii (3 orders), Squatinomorphii (1 genus), and Batoidea (4 or 5 orders).
The 36 elasmobranch species karyotyped by this method, together with 20 species using colchine, represent ~4.3% of living chondrichthyans.
A fusion model (rather than fission or modal models) best explained the data obtained for the galeomorphs and batoids studied and explains karyotypic change in other superorders.
www.publish.csiro.au /nid/126/paper/MF01139.htm   (175 words)

  
 Batoidea: FreeZone.SSan.com
Home > Pet Care > Fish Identification > Batoidea (Subscribe)
They are commonly known as rays, but that term may also be used specifically for batoids in the order Rajiformes, the "true rays".
The eyes and spiracles are located on top of the head.
freezone.ssan.com /cgi-bin/jump.cgi?Detailed=1288459   (193 words)

  
 Citebase - New data on the systematics and interrelationships of sawfishes (Elasmobranchii, Batoidea, Pristiformes)
Citebase - New data on the systematics and interrelationships of sawfishes (Elasmobranchii, Batoidea, Pristiformes)
New data on the systematics and interrelationships of sawfishes (Elasmobranchii, Batoidea, Pristiformes)
New characters based on the arrangement and morphology of dermal denticles show that sawfishes can be divided into two distinctive groups.
citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:q-bio/0507017   (188 words)

  
 Publications of Members of the ICAZ Fish Remains Working Group
Les denticules myrmicoodes, un nouveau caracthre diagnostique pour les Rajidae (Chondrichthyes, Batoidea).
Le revjtement cutani des raies (Chondrichthyes, Elasmobranchii, Batoidea).
DEYNAT P.P. BRITO, 1994 - Rivision des tubercules cutanis de raies (Chondrichthyes, Batoidea) du Bassin du Parana, tertiaire d'Amirique du Sud.
www.cs.otago.ac.nz /research/foss/ICAZ/articles.htm   (2468 words)

  
 Knorpelfische Knorpelfische Kiefermäuler Batoidea Seekatzen   (Site not responding. Last check: 2007-09-17)
Ihre bekanntesten Vertreter sind Haie (Selachii) und Rochen (Batoidea).
Werbe Informationen zu Knorpelfische, Batoidea Seekatzen Selachii Kiefermäuler sowie Tieren.
Bei den Knorpelfischen besteht das Skelett aus Knorpeln, die jedoch durch Kalkeinlagerung ziemlich hart sein können.
www.lexipda.de /infos/k/kn/knorpelfische.html   (556 words)

  
 Ray information - Search.com
A ray, or half-line in geometry or physics.
Any fish in the order Batoidea, especially true rays of the family Rajiformes (but not including skates).
Ray (optics), an idealized narrow beam of light.
domainhelp.search.com /reference/Ray   (505 words)

  
 Free Term Papers on Sharks
Sharks are classified under the class of Chondrichthyes, which is fish that have characteristics of a skeleton made of cartilage, jaws, paired fins, and paired nostrils.
The superorders are divided into two groups, which are Batoidea that have rays and their relatives and Selachii, which are sharks.
Most modern sharks have evolved 100 million years ago when dinosaurs lived on earth.
www.freefortermpapers.com /show_essay/1313.html   (419 words)

  
 sawfish writings sources
Deynat, P. New data on the systematics and interrelationships of sawfishes (Elasmobranchii, Batoidea, Pristiformes).
Dor, M. Checklist of the Fishes of the Red Sea.
(Elasmobranchii, Batoidea) in the Indian River Lagoon system, Florida.
www.floridasawfish.com /sources.html   (2701 words)

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